Understanding down-regulation of photosynthesis under water stress: future prospects and searching for physiological tools for irrigation management
Version of Record online: 16 MAR 2005
Annals of Applied Biology
Volume 144, Issue 3, pages 273–283, June 2004
How to Cite
FLEXAS, J., BOTA, J., CIFRE, J., MARIANO ESCALONA, J., GALMÉS, J., GULÍAS, J., LEFI, E.-K., FLORINDA MARTÍNEZ-CAÑELLAS, S., TERESA MORENO, M., RIBAS-CARBÓ, M., RIERA, D., SAMPOL, B. and MEDRANO, H. (2004), Understanding down-regulation of photosynthesis under water stress: future prospects and searching for physiological tools for irrigation management. Annals of Applied Biology, 144: 273–283. doi: 10.1111/j.1744-7348.2004.tb00343.x
- Issue online: 16 MAR 2005
- Version of Record online: 16 MAR 2005
- (Accepted 2 March 2004; Revised version received 10 December 2003)
- stomatal limitations;
- metabolic limitations;
Photosynthetic down-regulation and/or inhibition under water stress conditions are determinants for plant growth, survival and yield in drought-prone areas. Current knowledge about the sequence of metabolic events that leads to complete inhibition of photosynthesis under severe water stress is reviewed. An analysis of published data reveals that a key regulatory role for Rubisco in photosynthesis is improbable under water stress conditions. By contrast, the little data available for other Calvin cycle enzymes suggest the possibility of a key regulatory role for some enzymes involved in the regeneration of RuBP. There are insufficient data to determine the role of photophosphorylation.
Several important gaps in our knowledge of this field are highlighted. The most important is the remarkable scarcity of data about the regulation/inhibition of photosynthetic enzymes other than Rubisco under water stress. Consequently, new experiments are urgently needed to improve our current understanding of photosynthetic down-regulation under water stress. A second gap is the lack of knowledge of photosynthetic recovery after irrigation of plants which have been subjected to different stages of water stress. This knowledge is necessary in order to match physiological down-regulation by water stress with controlled irrigation programmes.