Plant, Cell & Environment

Cover image for Vol. 39 Issue 9

Early View (Online Version of Record published before inclusion in an issue)

Edited By: Keith Mott

Impact Factor: 6.169

ISI Journal Citation Reports © Ranking: 2015: 10/209 (Plant Sciences)

Online ISSN: 1365-3040

VIEW

  1. 1 - 41
  1. Original Articles

    1. Loss-of-function mutations in the APX1 gene result in enhanced selenium tolerance in Arabidopsis thaliana

      Li Jiang, Ziping Chen, Qiuchen Gao, Lingkun Ci, Shuqing Cao, Yi Han and Weiyan Wang

      Version of Record online: 24 AUG 2016 | DOI: 10.1111/pce.12762

      Excess selenium can induce oxidative stress and the accumulation of ROS in plant; however, little is known about the mechanism involved in selenium-stress response. We report a novel role of the APX1 gene in the selenium tolerance in Arabidopsis. Our findings reveal that cytosolic ascorbate peroxidase1 contributes to Se toxicity. The present research provides an avenue by which APX1 deficiency can be exploited to increase plant Se content and tolerance in the presence of Se for biofortification and phytoremediation of Se-contaminated environments.

  2. Commentaries

  3. Reviews

    1. Role of phytohormones in aluminium rhizotoxicity

      Peter M Kopittke

      Version of Record online: 12 AUG 2016 | DOI: 10.1111/pce.12786

      Elevated concentrations of soluble Al reduce root growth in acid soils, but much remains unknown regarding the toxicity of this Al as well as the mechanisms by which plants respond. This review examines changes in phytohormones in Al-stressed plants. The information presented here will assist in focusing future research efforts in examining the importance of phytohormones in plant tissues exposed to toxic levels of Al.

  4. Original Articles

    1. Ethylene-dependent aerenchyma formation in adventitious roots is regulated differently in rice and maize

      Takaki Yamauchi, Akihiro Tanaka, Hitoshi Mori, Itsuro Takamure, Kiyoaki Kato and Mikio Nakazono

      Version of Record online: 12 AUG 2016 | DOI: 10.1111/pce.12766

      Internal transport of oxygen from shoots to roots through aerenchyma is essential for the survival of plants under oxygen-deficient conditions in waterlogged soil. A gene encoding 1-aminocyclopropane-1-carboxylic acid oxidase (ACO) is expressed more strongly in rice roots than in maize roots under aerobic conditions. This results in faster and greater stimulation of ethylene production and ethylene-dependent lysigenous aerenchyma formation in rice roots than in maize roots after the initiation of oxygen-deficient conditions and explains rice's greater tolerance of waterlogging.

    2. Growth inhibition by selenium is associated with changes in primary metabolism and nutrient levels in Arabidopsis thaliana

      Dimas M. Ribeiro, Dalton D. Silva Júnior, Flávio Barcellos Cardoso, Auxiliadora O. Martins, Welder A. Silva, Vitor L. Nascimento and Wagner L. Araújo

      Version of Record online: 12 AUG 2016 | DOI: 10.1111/pce.12783

      • Although high levels of Selenium negatively impact both plant growth and development the molecular mechanism behind such response remains unknown.
      • Selenium reduces plant growth and altered both central primary metabolism and the levels of some minerals.
      • We found that high levels of Selenium lead to both common changes in primary carbon metabolism following several stress and Selenium specific metabolic patterns.
    3. Stomatal acclimation to vapour pressure deficit doubles transpiration of small tree seedlings with warming

      Renée M. Marchin, Alice A. Broadhead, Laura E. Bostic, Robert R. Dunn and William A. Hoffmann

      Version of Record online: 12 AUG 2016 | DOI: 10.1111/pce.12790

      In this study, we explored the question of whether plant stomata acclimate to vapour pressure deficit (VPD) over long-term (i.e. months) exposure to high VPD. We measured the effect of experimental warming on transpiration and stomatal conductance (gs) of small tree seedlings in the temperate forest understory to determine the effect of temperature (T) and VPD on plant stomatal behaviour. Warming doubled water use of two ring-porous genera (hickory, oak), but did not significantly increase transpiration of red maple. Increased transpiration was partially attributed to stomatal acclimation to VPD, where increases in gsref (gs at VPD = 1 kPa) and stomatal sensitivity to VPD occurred under high VPD due to warming. Acclimation responses differ from expectations based on the well-known relationship between gs and VPD and may necessitate revision of current models based on this assumption.

    4. Temperature controls on the basal emission rate of isoprene in a tropical tree Ficus septica: exploring molecular regulatory mechanisms

      Ishmael Mutanda, Masashi Inafuku, Seikoh Saitoh, Hironori Iwasaki, Masakazu Fukuta, Keiichi Watanabe and Hirosuke Oku

      Version of Record online: 12 AUG 2016 | DOI: 10.1111/pce.12797

      Biosynthesis and emission of biogenic isoprene are very sensitive to temperature, but the mechanisms of regulation are not yet fully resolved. In this work, we show that when challenged with changing daily temperature, the tropical tree Ficus septica adjusts its isoprene biosynthesis through transcriptional regulation of isoprene synthase (IspS) gene. Changes in 2-C-methyl-D-erythritol 4-phosphate (MEP) pathway gene expressions and metabolite pool sizes do not support MEP pathway regulation as the major regulatory mechanism. Gene expressions, network inference of transcriptomic data and cis-regulatory elements on the isolated IspS promoter suggests transcriptional regulation of IspS most likely by transcription factors of the circadian rhythm and phytohormone-related pathways as a possible molecular mechanism by which temperature regulates basal isoprene emission.

  5. Reviews

    1. An ecophysiological and developmental perspective on variation in vessel diameter

      Uwe G. Hacke, Rachel Spicer, Stefan G. Schreiber and Lenka Plavcová

      Version of Record online: 9 AUG 2016 | DOI: 10.1111/pce.12777

      Variation in xylem vessel diameter impacts transport efficiency, vulnerability to freezing-induced embolism, and other aspects of plant biology. This review provides a synthesis of the ecophysiological implications of variation in lumen diameter together with a summary of our current understanding of vessel development and its endogenous regulation. Emphasis is placed on the presumed role of auxin at multiple developmental stages.

  6. Original Articles

    1. Interaction of drought and ozone exposure on isoprene emission from extensively cultivated poplar

      Xiangyang Yuan, Vicent Calatayud, Feng Gao, Silvano Fares, Elena Paoletti, Yuan Tian and Zhaozhong Feng

      Version of Record online: 9 AUG 2016 | DOI: 10.1111/pce.12798

      The isoprene emission of a poplar clone depended on drought, O3, leaf position and sampling time. Significant interactive effects of O3 and drought on isoprene emission were found at plant level rather than at leaf-unit level. When the responses were up-scaled to the entire-plant level, in fact, drought effects on total leaf area translated into around twice higher emission from well-watered plants in clean air than in E-O3. Current results suggest that direct effects on plant emission rates and changes in total leaf area may affect isoprene emission from intensively cultivated hybrid poplar under combined mild drought and O3 exposure, with important feedbacks for air quality.

    2. The miR393a/target module regulates seed germination and seedling establishment under submergence in rice (Oryza sativa L.)

      Fu Guo, Ning Han, Yakun Xie, Ke Fang, Yinong Yang, Muyuan Zhu, Junhui Wang and Hongwu Bian

      Version of Record online: 9 AUG 2016 | DOI: 10.1111/pce.12781

      The coleoptile, which is unique to monocots, plays an important role during seed germination in cereal crops. Our results demonstrated that miR393a regulated the coleoptile elongation, stomatal development and auxin accumulation and that its expression was modulated by submergence and ABA. The identification of the roles of miR393a/target module in rice seed germination under submergence may provide new perspectives on the direct sowing of rice seeds in flooded paddy fields.

    3. Tomato plants increase their tolerance to low temperature in a chilling acclimation process entailing comprehensive transcriptional and metabolic adjustments

      Javier Barrero-Gil, Raúl Huertas, José Luís Rambla, Antonio Granell and Julio Salinas

      Version of Record online: 9 AUG 2016 | DOI: 10.1111/pce.12799

      Low temperature is a major environmental stress that seriously limits plant development, distribution and productivity. Plants from tropical regions, including many crops, are highly sensitive to chilling temperatures. In this study, we demonstrate that tomato plants increase their chilling tolerance when previously exposed to suboptimal growth temperatures, an adaptive response termed chilling acclimation, and that this response entails comprehensive transcriptomic and metabolic adjustments. Moreover, our results reveal strong resemblances between chilling acclimation in tomato and cold acclimation in temperate plants, which raises significant questions regarding plant adaptation to cold climates, and important divergences that may account for the freezing sensitivity of tomato plants.

    4. OsPAP10c, a novel secreted acid phosphatase in rice, plays an important role in the utilization of external organic phosphorus

      Linghong Lu, Wenmin Qiu, Wenwen Gao, Stephen D. Tyerman, Huixia Shou and Chuang Wang

      Version of Record online: 9 AUG 2016 | DOI: 10.1111/pce.12794

      Rice acid phosphatase encoding gene, OsPAP10c, is phosphate starvation specifically induced at both mRNA and protein levels. It is a novel secreted protein, playing an important role in the utilization of external organic P in rice.

    5. You have full text access to this OnlineOpen article
      Differential expression of microRNAs and potential targets under drought stress in barley

      Jannatul Ferdous, Juan Carlos Sanchez-Ferrero, Peter Langridge, Linda Milne, Jamil Chowdhury, Chris Brien and Penny J. Tricker

      Version of Record online: 4 AUG 2016 | DOI: 10.1111/pce.12764

      A role for microRNAs in regulating gene responses to abiotic stress has been well established but translating this information to practical crop improvement has proved difficult, because we have had little knowledge about genotypic stress-induced variation in expression of miRNAs and their targets. MicroRNA/gene target interaction is usually predicted from bioinformatic analysis of small RNA and degradome sequencing data. Of 11 predicted, drought-regulated microRNAs we were able to show inverse correlation of only two microRNA/ target pairs under drought, and this was genotype dependent. Our results show genotypic variation in miRNA expression and provide evidence of drought-responsive regulation of important microRNA target genes.

    6. HD2C histone deacetylase and a SWI/SNF chromatin remodelling complex interact and both are involved in mediating the heat stress response in Arabidopsis

      Daniel Buszewicz, Rafał Archacki, Antoni Palusiński, Maciej Kotliński, Anna Fogtman, Roksana Iwanicka-Nowicka, Katarzyna Sosnowska, Jan Kuciński, Piotr Pupel, Jacek Olędzki, Michał Dadlez, Aleksandra Misicka, Andrzej Jerzmanowski and Marta Kamila Koblowska

      Version of Record online: 4 AUG 2016 | DOI: 10.1111/pce.12756

      Histone deacetylases (HDACs) and chromatin remodelling complexes (CRCs) regulate gene expression by modifying chromatin structure. Applying immunoprecipitation followed by protein mass spectrometry analysis, this study identifies HD2C HDAC as an interactor of BRM-containing SWI/SNF CRC in Arabidopsis. Phenotypic and transcriptome analyses of 3-week-old hd2c, brm and brm hd2c plants indicate that HD2C and BRM ATPase jointly regulate heat stress response. Peptide pull-down experiments indicate that HD2C binds to both histone H3 and histone H4 peptides. Several genes misexpressed in hd2c mutant show increased levels of H4K16 acetylation on gene bodies, suggesting that HD2C may cooperate in repressing heat-responsive genes by removing lysine acetylation from nucleosomal histones.

    7. Drought-induced xylem pit membrane damage in aspen and balsam poplar

      Rachel M. Hillabrand, Uwe G. Hacke and Victor J. Lieffers

      Version of Record online: 30 JUL 2016 | DOI: 10.1111/pce.12782

      In this study, evidence is provided for drought-induced increases in xylem pit membrane porosity in aspen and balsam poplar as viewed by scanning electron microscopy (SEM). These results, in combination with hydraulic conductivity measurements, support the hypothesis of pit membrane damage as a mechanism for the phenomenon known as ‘cavitation fatigue’ or ‘air-seeding fatigue’ whereby trees exhibit an increased vulnerability to a loss of their hydraulic conductivity after a drought. This type of irreversible damage may be especially detrimental for forests predicted to be at an increased risk for drought under climate change.

    8. Different cytokinin histidine kinase receptors regulate nodule initiation as well as later nodule developmental stages in Medicago truncatula

      Stéphane Boivin, Théophile Kazmierczak, Mathias Brault, Jiangqi Wen, Pascal Gamas, Kirankumar S. Mysore and Florian Frugier

      Version of Record online: 28 JUL 2016 | DOI: 10.1111/pce.12779

      Legume plants adapt to low nitrogen by developing an endosymbiosis with nitrogen-fixing soil bacteria to form a new specific organ: the nitrogen-fixing nodule. We show here in the Medicago truncatula model legume that besides the MtCRE1 cytokinin receptor that is essential for this symbiotic interaction, other CHASE-domain containing histidine kinases are positively and redundantly required during nodule initiation and to determine the nodule nitrogen fixation capacity. An AHK4/CRE1 genomic locus from the aposymbiotic Arabidopsis plant rescues nodule initiation but not the nitrogen fixation capacity, suggesting that legume-specific determinants encoded by the MtCRE1 gene are required for late nodulation stages but not initiation.

    9. Physiological significance of isoprenoids and phenylpropanoids in drought response of Arundinoideae species with contrasting habitats and metabolism

      Violeta Velikova, Cecilia Brunetti, Massimiliano Tattini, Dilyana Doneva, Mastaneh Ahrar, Tsonko Tsonev, Miroslava Stefanova, Tsveta Ganeva, Antonella Gori, Francesco Ferrini, Claudio Varotto and Francesco Loreto

      Version of Record online: 26 JUL 2016 | DOI: 10.1111/pce.12785

      There is increasing interest in understanding the occurrence and importance of functional and structural traits, which determine plant plasticity under global change scenarios. In the present study, functional, metabolic and structural evidences are presented explaining why Arundo donax is a species more resistant to drought and has a better plasticity than other Arundinoideae. Our analyses demonstrate that volatile and non-volatile isoprenoids produced by A. donax efficiently preserve the chloroplasts from transient drought damage, while Hakonechloa macra invests on phenylpropanoids that are less efficient in preserving photosynthesis but likely offer better antioxidant protection under prolonged stress.

  7. Commentaries

    1. Xylem refilling – a question of sugar transporters and pH?

      Uwe G. Hacke and Joan Laur

      Version of Record online: 25 JUL 2016 | DOI: 10.1111/pce.12784

  8. Original Articles

    1. Early changes in apoplast composition associated with defence and disease in interactions between Phaseolus vulgaris and the halo blight pathogen Pseudomonas syringae Pv. phaseolicola

      Brendan M. O'Leary, Helen C. Neale, Christoph-Martin Geilfus, Robert W. Jackson, Dawn L. Arnold and Gail M. Preston

      Version of Record online: 25 JUL 2016 | DOI: 10.1111/pce.12770

      The apoplastic compartment is the arena in which endophytic pathogens such as Pseudomonas syringae grow and interact with plant cells. Controlling the composition of the apoplast during plant–pathogen interactions could underlie evolutionary strategies for survival of both the host plant and invading bacteria. Here we combine an apoplast extraction method with metabolomic and ion analyses techniques to describe the composition of the apoplast of Phaseolus vulgaris leaves, and to determine changes in apoplast composition associated with resistant and susceptible interactions with the bacterial pathogen P. syringae pv. phaseolicola. We demonstrate that the apoplast is replete with nutrients that can be used to support pathogen growth, and identify certain ions and metabolites that increases dramatically in the apoplast of plants expressing effector-triggered immunity

    2. Plumbing the depths: extracellular water storage in specialized leaf structures and its functional expression in a three-domain pressure –volume relationship

      Hoa T. Nguyen, Patrick Meir, Joe Wolfe, Maurizio Mencuccini and Marilyn C. Ball

      Version of Record online: 25 JUL 2016 | DOI: 10.1111/pce.12788

      The pressure-volume relationships in field grown leaves of the mangrove, Avicennia marina, exhibited three domains dominated successively by 1) the presence and consumption of extracellular water, 2) variable turgor and loss of intracellular water, and 3) osmotic behavior of flaccid cells and plasmolysis. Multiple sites of extracellular water storage were identified, including hollow trichomes and novel structures named “cisternae”. When fully charged, extracellular and cellular water storage could support a typical evaporation rate of 1 mmol m−2s−1 for 54 and 50 min, respectively, before turgor loss was reached. This study emphasizes the importance of leaf anatomy for the interpretation of PV curves, and identifies extracellular water storage sites that enable transient water use without substantive turgor loss when other factors, such as high soil salinity, constrain rates of water transport.

    3. You have full text access to this OnlineOpen article
      Nitric oxide-fixation by non-symbiotic haemoglobin proteins in Arabidopsis thaliana under N-limited conditions

      Gitto Thomas Kuruthukulangarakoola, Jiangli Zhang, Andreas Albert, Barbro Winkler, Hans Lang, Franz Buegger, Frank Gaupels, Werner Heller, Bernhard Michalke, Hakan Sarioglu, Jörg-Peter Schnitzler, Kim Henrik Hebelstrup, Jörg Durner and Christian Lindermayr

      Version of Record online: 25 JUL 2016 | DOI: 10.1111/pce.12773

      This study reports about a NO-fixing mechanism in Arabidopsis, which allows the fixation of atmospheric NO into nitrogen metabolism. Non-symbiotic haemoglobin class 1 and class 2 were identified as key proteins of the NO-fixation pathway converting NO to nitrate, which is further introduced into the N-metabolism. This mechanism is probably important under conditions with limited N supply via the soil. Moreover, the plant-based NO uptake lowers the concentration of insanitary atmospheric NOx, and in this context, NO-fixation can be beneficial to air quality.

    4. Control of floral transition in the bioenergy crop switchgrass

      Lifang Niu, Chunxiang Fu, Hao Lin, Tezera W. Wolabu, Yanqi Wu, Zeng-Yu Wang and Million Tadege

      Version of Record online: 20 JUL 2016 | DOI: 10.1111/pce.12769

      Floral transition is an important biomass trait because longer vegetative phase results in the accumulation of more lignocellulosic biomass. Switchgrass is one of the dedicated biomass feedstocks in the U.S. but the control of its floral transition has not been studied at the molecular level. In this report, we identified PvFT1 as one of the switchgrass florigens together with three AP1-like downstream targets and two SOC1-like genes, which together comprise the switchgrass floral integrators similar to Arabidopsis and rice. This work lays the foundation for understanding the molecular mechanism of floral transition in switchgrass and its ultimate manipulation for improving biomass feedstock yield.

    5. Diacylglycerol kinases activate tobacco NADPH oxidase-dependent oxidative burst in response to cryptogein

      Jean-Luc Cacas, Patricia Gerbeau-Pissot, Jérôme Fromentin, Catherine Cantrel, Dominique Thomas, Emmanuelle Jeannette, Tetiana Kalachova, Sébastien Mongrand, Françoise Simon-Plas and Eric Ruelland

      Version of Record online: 20 JUL 2016 | DOI: 10.1111/pce.12771

      Cryptogein is a protein secreted by the oomycete Phytophthora cryptogea that activates defence mechanisms in tobacco. We show here in BY-2 tobacco suspension cells that phosphatidic acid rapidly accumulates in response to cryptogein because of the coordinated onset of phosphoinositide-dependent phospholipase C and diacylglycerol kinase activities. Both enzyme specific inhibitors and silencing of the phylogenetic cluster III of the tobacco DGK family were found to reduce PA production upon elicitation and to strongly decrease the RBOHD-mediated oxidative burst. This establishes that phosphatidic acid production by diacylglycerol kinases is upstream of the oxidative burst in response to cryptogein.

    6. Hydraulic conductance and the maintenance of water balance in flowers

      Adam B. Roddy, Craig R. Brodersen and Todd E. Dawson

      Version of Record online: 18 JUL 2016 | DOI: 10.1111/pce.12761

      Flowers are fundamental to successful reproduction for most angiosperm species, yet we know little about how they maintain turgor and regulate water supply and loss. We surveyed a phylogenetically diverse set of species for hydraulic and structural traits associated with the ability to transport water and prevent water loss. The largest variation was among major angiosperm clades, which showed divergent hydraulic structure–function relationships. This suggests that flower of more recently derived clades may rely on preventing the loss of stored water to maintain turgor rather than maintaining high fluxes of water to meet the demands of transpiration.

    7. You have full text access to this OnlineOpen article
      The carbon bonus of organic nitrogen enhances nitrogen use efficiency of plants

      Oskar Franklin, Camila Aguetoni Cambui, Linda Gruffman, Sari Palmroth, Ram Oren and Torgny Näsholm

      Version of Record online: 29 JUN 2016 | DOI: 10.1111/pce.12772

    8. Volatile compounds emitted by diverse phytopathogenic microorganisms promote plant growth and flowering through cytokinin action

      Ángela María Sánchez-López, Marouane Baslam, Nuria De Diego, Francisco José Muñoz, Abdellatif Bahaji, Goizeder Almagro, Adriana Ricarte-Bermejo, Pablo García-Gómez, Jun Li, Jan F. Humplík, Ondřej Novák, Lukáš Spíchal, Karel Doležal, Edurne Baroja-Fernández and Javier Pozueta-Romero

      Version of Record online: 16 JUN 2016 | DOI: 10.1111/pce.12759

      It is known that volatile emissions from some beneficial rhizosphere microorganisms promote plant growth. Here we show that volatile compounds (VCs) emitted by phylogenetically diverse rhizosphere and non-rhizhosphere bacteria and fungi (including plant pathogens and microbes that do not normally interact mutualistically with plants) promote growth and flowering of various plant species, including crops. Transcriptomic analyses revealed that many genes differentially expressed in Arabidopsis plants treated with VCs emitted by the fungal phytopathogen Alternaria alternata were also differentially expressed in plants exposed to VCs emitted by the plant growth promoting rhizobacterium Bacillus subtilis GB03, suggesting that plants react to microbial VCs through highly conserved regulatory mechanisms. The discovery that VCs from pathogenic microorganisms can have beneficial effects on plant growth and development extends knowledge of the diversity and complexity of the interactions involved in modulation of plant physiology, raising questions regarding the evolution of the processes, their ecological significance and potential applications.

  9. Reviews

    1. The β-cyanoalanine synthase pathway: beyond cyanide detoxification

      Marylou Machingura, Eitan Salomon, Joseph M. Jez and Stephen D. Ebbs

      Version of Record online: 16 JUN 2016 | DOI: 10.1111/pce.12755

      This review focuses on the cyanoalanine synthase pathway in plants and covers both its distribution within the plant kingdom and the broader range of functions now attributed to this pathway. For decades, this pathway has been described solely in terms of its role in cyanide detoxification. This has been an entrenched paradigm that has not changed measurably since the pathway's discovery in the 1960s. Research to date, however, has demonstrated that the functions of the pathway stretch beyond simple cyanide detoxification and encompass a range of functions that are fundamental to plant growth and development as well as to stress tolerance. There have been reviews in the past decade or so on cyanide, cyanogenesis and the range of biological degradation/assimilatory pathways for cyanide, but none have specifically focused on the distribution and function of the β-cyanoalanine synthase pathway as we do here. A fundamental goal of this manuscript is to expand the perception of this pathway and its functional importance.

  10. Opinions

    1. Toward an index of desiccation time to tree mortality under drought

      Chris J. Blackman, Sebastian Pfautsch, Brendan Choat, Sylvain Delzon, Sean M. Gleason and Remko A. Duursma

      Version of Record online: 16 JUN 2016 | DOI: 10.1111/pce.12758

  11. Original Articles

    1. A dual system formed by the ARC and NR molybdoenzymes mediates nitrite-dependent NO production in Chlamydomonas

      Alejandro Chamizo-Ampudia, Emanuel Sanz-Luque, Ángel Llamas, Francisco Ocaña-Calahorro, Vicente Mariscal, Alfonso Carreras, Juan B. Barroso, Aurora Galván and Emilio Fernández

      Version of Record online: 12 MAY 2016 | DOI: 10.1111/pce.12739

      A mechanism for nitric oxide production from nitrite is described in plants. Nitrate Reductase is a key enzyme for this function, but not as a catalyser but as an electrons supplier for another molybdoenzyme (NOFNIR) to produce nitric oxide from nitrite in the presence of nitrate.

    2. Shoot tolerance mechanisms to iron toxicity in rice (Oryza sativa L.)

      Lin-Bo Wu, Yoshiaki Ueda, Shang-Kun Lai and Michael Frei

      Version of Record online: 12 MAY 2016 | DOI: 10.1111/pce.12733

    3. The Arabidopsis trichome is an active mechanosensory switch

      Li Hong Zhou, Shao Bao Liu, Peng Fei Wang, Tian Jian Lu, Feng Xu, Guy M. Genin and Barbara G. Pickard

      Version of Record online: 4 MAY 2016 | DOI: 10.1111/pce.12728

      The trichome is a sensor enabling Arabidopsis (and probably its agricultural relatives) to detect forces on the order of the weights that insects apply. When a trichome is bent or brushed, the unique tapering of its wall facilitates basal force transmission and focusing on a pliant zone, which consequently buckles. Force impinging on a surrounding skirt of cells is transduced to a chemical signal, evidenced as oscillation of cytosolic Ca2+. Elevation of apoplastic skirt cell pH is another indicator that the trichome has switched on chemical activity.

  12. Special Issues

    1. The redox control of photorespiration: from biochemical and physiological aspects to biotechnological considerations

      Olivier Keech, Per Gardeström, Leszek A. Kleczkowski and Nicolas Rouhier

      Version of Record online: 21 APR 2016 | DOI: 10.1111/pce.12713

      This review discusses known and potential redox regulation mechanisms that might affect the photorespiratory enzymes as well as the peripheral enzymes associated to photorespiration. The reported post-translational modifications of key cysteine residues in these enzymes add another layer of complexity for their regulation, which has to be taken into account for any biotechnological strategies aiming at minimizing growth losses associated with photorespiration.

  13. Original Articles

    1. WD40-REPEAT 5a functions in drought stress tolerance by regulating nitric oxide accumulation in Arabidopsis

      Wen-Cheng Liu, Yun-Hui Li, Hong-Mei Yuan, Bing-Lei Zhang, Shuang Zhai and Ying-Tang Lu

      Version of Record online: 18 APR 2016 | DOI: 10.1111/pce.12723

    2. Polyamine oxidase 5 loss-of-function mutations in Arabidopsis thaliana trigger metabolic and transcriptional reprogramming and promote salt stress tolerance

      Xavier Zarza, Kostadin E. Atanasov, Francisco Marco, Vicent Arbona, Pedro Carrasco, Joachim Kopka, Vasileios Fotopoulos, Teun Munnik, Aurelio Gómez-Cadenas, Antonio F. Tiburcio and Rubén Alcázar

      Version of Record online: 13 APR 2016 | DOI: 10.1111/pce.12714

      Arabidopsis atpao5 loss-of-function mutants exhibit constitutive accumulation of thermospermine (tSpm) that associates with enhanced salt tolerance. tSpm triggers transcriptional and metabolic changes that involve promotion of ABA and JA pathways, accumulation of TCA cycle intermediates, compatible solutes along with other effects that additively contribute to salt tolerance. We provide evidence for the involvement of tSpm in plant abiotic stress tolerance.

  14. Reviews

  15. Special Issues

    1. NADPH oxidases differentially regulate ROS metabolism and nutrient uptake under cadmium toxicity

      D. K. Gupta, L. B. Pena, M. C. Romero-Puertas, A. Hernández, M. Inouhe and L. M. Sandalio

      Version of Record online: 1 APR 2016 | DOI: 10.1111/pce.12711

      Under cadmium stress, respiratory burst oxydase homologs (RBOHs) differentially regulate H2O2 production, with RBOHC being the most important source of reactive oxygen species; anti-oxidative defences are also differentially regulated, with superoxide dismutase regulation by RBOHC, as well as the regulation of redox-couple GSH/GSSG ratio by RBOHC and D and the ASA/DHA by RBOHF being the most important factors. Our results also suggest that RBOHs can play an important role in regulating the root-to-shoot nutrient transport and are important players in the nutrient regulatory hub and, for instance, can be of potential interest in biotechnology to protect shoot from heavy metals.

  16. Special Issue

    1. Nitric oxide function in plant abiotic stress

      Nurun Nahar Fancy, Ann-Kathrin Bahlmann and Gary J. Loake

      Version of Record online: 1 MAR 2016 | DOI: 10.1111/pce.12707

      In this manuscript, we focus on the current state-of-the-art regarding the role of nitric oxide (NO) and S-nitrosylation during abiotic stress responses in plants. This is significant because NO and S-nitrosylation are emerging as important players in plant abiotic stress signalling. The paper should be of interest to readers in the areas of plant abiotic stress, signalling, redox regulation, NO function and S-nitrosylation.

    2. Functional characterization of the chaperon-like protein Cdc48 in cryptogein-induced immune response in tobacco

      Claire Rosnoblet, Hervé Bègue, Cécile Blanchard, Carole Pichereaux, Angélique Besson-Bard, Sébastien Aimé and David Wendehenne

      Version of Record online: 18 JAN 2016 | DOI: 10.1111/pce.12686

      In a previous study, we demonstrated that the chaperone-like protein NtCdc48 is regulated by S-nitrosylation in tobacco cells undergoing an immune response triggered by cryptogein, an elicitin produced by the oomycete Phytophthora cryptogea. In the present original study, we further investigated the function of this chaperone in cryptogein signalling and cryptogein-triggered hypersensitive-like cell death. We reported that only a small proportion of the overall NtCdc48 protein population undergoes S-nitrosylation. However, using different strategies such as gel filtration in native conditions, immunoprecipitation and the generation of a tobacco cell line overexpressing NtCdc48, we demonstrated that this protein is mobilized in response to cryptogein, is present as a hexameric and active complex and interacts with numerous partners related to proteasome-dependent degradation, subcellular trafficking and redox regulation. Importantly, our study highlighted a role for NtCdc48 in cryptogein-triggered cell death. Altogether, this investigation designs NtCdc48 as a new component of plant immunity.

  17. Reviews

    1. The nitrogen–potassium intersection: membranes, metabolism, and mechanism

      Devrim Coskun, Dev T. Britto and Herbert J. Kronzucker

      Version of Record online: 18 JAN 2016 | DOI: 10.1111/pce.12671

      This review summarizes fundamental intersections between the pathways of inorganic nitrogen (NH4+ and NO3) and potassium (K+) acquisition in plants. Uptake, storage, translocation and metabolism are discussed at levels of organization ranging from molecular-genetic processes to whole-plant physiology. The regulation and optimization of plant growth, yield, metabolism and water-use efficiency are discussed in this nutritional context.

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