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Published on May 1, 2009; 10.1104/pp.109.139378

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Received April 1, 2009
Accepted April 25, 2009

Cytokinin-dependent photorespiration and the protection of photosynthesis during water deficit

Rosa M. Rivero , Vladimir Shulaev , and Eduardo Blumwald *

Department Plant Sciences, University of California, Davis, CA 95616; Virginia Polytech Inst & State Univ, Virginia Bioinformatics Inst, Blacksburg, VA 24061

* Corresponding author; email: eblumwald{at}ucdavis.edu.

We investigated the effects of PSARK::IPT expression and cytokinins production on several aspects of photosynthesis in transgenic tobacco plants grown under optimal or restricted (30% of the optimal) watering regimes. There were no significant differences in stomatal conductance between leaves from wild-type and transgenic PSARK-IPT plants grown under optimal or restricted watering. On the other hand, there was a significant reduction in the maximum rate of electron transport as well as the use of triose phosphates only in wild-type plants during growth under restricted watering, indicating a biochemical control of photosynthesis during the growth under water deficit. During water deficit conditions, the transgenic plants displayed an increase in catalase inside peroxisomes, maintained a physical association among chloroplasts, peroxisomes and mitochondria and increased the CO2-compensation point, indicating the cytokinin-mediated occurrence of photorespiration in the transgenic plants. The contribution of photorespiration to the tolerance of the transgenic plants to water deficit was also supported by the increase in transcripts coding for enzymes involved in the conversion of glycolate to RuBP. Moreover, the increase in transcripts indicated a cytokinin-induced elevation in photorespiration, suggesting the contribution of photorespiration in the protection of photosynthetic processes and its beneficial role during water stress.






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