Plant Physiol. Illumina
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

First published online May 1, 2009; 10.1104/pp.109.139378

Plant Physiology 150:1530-1540 (2009)
© 2009 American Society of Plant Biologists

OPEN ACCESS ARTICLE
This Article
Free via Open Access: OA
Right arrow OA Full Text
Right arrow Full Text (PDF)
Right arrow Supplemental Data
Right arrowOA All Versions of this Article:
150/3/1530    most recent
pp.109.139378v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Related articles in Plant Physiol.
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Rivero, R. M.
Right arrow Articles by Blumwald, E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Rivero, R. M.
Right arrow Articles by Blumwald, E.
Agricola
Right arrow Articles by Rivero, R. M.
Right arrow Articles by Blumwald, E.
ENVIRONMENTAL STRESS AND ADAPTATION TO STRESS

Cytokinin-Dependent Photorespiration and the Protection of Photosynthesis during Water Deficit1,[W],[OA]

Rosa M. Rivero, Vladimir Shulaev and Eduardo Blumwald*

Department Plant Sciences, University of California, Davis, California 95616 (R.M.R., E.B.); and Virginia Polytechnical Institute and State University, Virginia Bioinformatics Institute, Blacksburg, Virginia 24061 (V.S.)

We investigated the effects of PSARK::IPT (for Senescence-Associated Receptor Kinase::Isopentenyltransferase) expression and cytokinin production on several aspects of photosynthesis in transgenic tobacco (Nicotiana tabacum cv SR1) plants grown under optimal or restricted (30% of 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 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 transgenic plants to water deficit was also supported by the increase in transcripts coding for enzymes involved in the conversion of glycolate to ribulose-1,5-bisphosphate. 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.

1 This work was supported by the University of California Discovery Program, Arcadia Biosciences, and the Will W. Lester Endowment, University of California, Davis.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Eduardo Blumwald (eblumwald{at}ucdavis.edu).

[W] The online version of this article contains Web-only data.

[OA] Open Access articles can be viewed online without a subscription.

www.plantphysiol.org/cgi/doi/10.1104/pp.109.139378

* Corresponding author; e-mail eblumwald{at}ucdavis.edu.

Received April 1, 2009; accepted April 25, 2009; published May 1, 2009.


Related articles in Plant Physiol.:

On the Inside
Peter V. Minorsky
Plant Physiol. 2009 150: 1107-1108. [Full Text]  





HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 2009 by the American Society of Plant Biologists