Expression of PIP1 and PIP2 aquaporins is enhanced in olive dwarf genotypes and is related to root and leaf hydraulic conductance

  1. Claudio Lovisolo1,†,*,
  2. Francesca Secchi1,†,
  3. Andrea Nardini2,
  4. Sebastiano Salleo2,
  5. Rosalia Buffa3,
  6. Andrea Schubert1,4

Article first published online: 18 APR 2007

DOI: 10.1111/j.1399-3054.2007.00902.x

Issue

Physiologia Plantarum

Physiologia Plantarum

Volume 130, Issue 4, pages 543–551, August 2007

Additional Information

How to Cite

Lovisolo, C., Secchi, F., Nardini, A., Salleo, S., Buffa, R. and Schubert, A. (2007), Expression of PIP1 and PIP2 aquaporins is enhanced in olive dwarf genotypes and is related to root and leaf hydraulic conductance. Physiologia Plantarum, 130: 543–551. doi: 10.1111/j.1399-3054.2007.00902.x

Author Information

  1. 1

    Dipartimento di Colture Arboree, Università di Torino, Via Leonardo da Vinci 44, 10095 Grugliasco, Italy

  2. 2

    Dipartimento di Biologia, Università di Trieste, Via L. Giorgieri 10, 34127 Trieste, Italy

  3. 3

    Dipartimento di Colture Arboree, Università di Palermo, Viale delle Scienze 11, 90128 Palermo, Italy

  4. 4

    IVV, CNR, Via Leonardo da Vinci 44, 10095 Grugliasco, Italy

  1. †

    These authors contributed equally to this work.

* *e-mail: claudio.lovisolo@unito.it

Publication History

  1. Issue published online: 18 APR 2007
  2. Article first published online: 18 APR 2007
  3. Received 1 December 2006; revised 22 January 2007

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The expression of OePIP1.1 and OePIP2.1 aquaporins in root, stem and leaf was higher in Olea europaea L. (olive) plants carrying a dwarfing (D) clone as rootstock, than in plants carrying a vigorous (M) clone as rootstock. The highest difference of expression between plants with D and M rootstocks was detected in the root and for the PIP2 gene, the transcripts of which show a high water channel activity in oocytes.

 Compared with plants with M rootstock, plants with D rootstock showed reduced root and canopy biomass and reduced hydraulic conductance of the bulk root system (Kroot). Hydraulic conductance of D roots was higher than that of M roots when Kroot was scaled by root DW, in agreement with a higher expression of PIP genes. Leaf hydraulic conductance scaled by unit leaf surface area was almost twice as high in leaves from D plants compared with that in leaves from M plants.

 Modification of root growth imposed by grafting M onto D and D onto M slightly changed expression levels of root OePIP1.1 gene, the transcripts of which show almost null water channel activity in oocytes, suggesting a role less evident for OePIP1.1 in root hydraulic reequilibration.

 The role of PIP aquaporin gene expression in partially compensating reductions of plant hydraulic conductance is discussed.

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