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JXB Advance Access originally published online on February 5, 2007
Journal of Experimental Botany 2007 58(5):1207-1217; doi:10.1093/jxb/erl291
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© The Author [2007]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Inhibition of photosynthesis and energy dissipation induced by water and high light stresses in rice

Yanhong Zhou1,2, Hon Ming Lam3 and Jianhua Zhang2,*

1Department of Horticulture, Zhejiang University, Hangzhou, China
2Department of Biology, Hong Kong Baptist University, Hong Kong, China
3Department of Biology, The Chinese University of Hong Kong, Hong Kong, China

* To whom correspondence should be addressed. E-mail: jzhang{at}hkbu.edu.hk

Photoprotection mechanisms of rice plants were studied when its seedlings were subjected to the combined stress of water and high light. The imposition of water stress, induced by PEG 6000 which was applied to roots, resulted in substantial inhibition of stomatal conductance and net photosynthesis under all irradiance treatments. Under high light stress, the rapid decline of photosynthesis with the development of water stress was accompanied by decreases in the maximum velocity of RuBP carboxylation by Rubisco (Vcmax), the capacity for ribulose-1,5-bisphosphate regeneration (Jmax), Rubisco and stromal FBPase activities, and the quantum efficiency of photosystem II, in the absence of any stomatal limitation of CO2 supply. Water stress significantly reduced the energy flux via linear electron transport (JPSII), but increased light-dependent and {Delta}pH- and xanthophyll-mediated thermal dissipation (JNPQ). It is concluded that the drought-induced inhibition of photosynthesis under different irradiances in the rice was due to both diffusive and metabolic limitations. Metabolic limitation of photosynthesis may be related to the adverse effects of some metabolic processes and the oxidative damage to the chloroplast. Meanwhile, an enhanced thermal dissipation is an important process to minimize the adverse effects of drought and high irradiance when CO2 assimilation is suppressed.

Key words: Light stress, Oryza sativa, photosynthesis, photoprotection, photoinhibition, rice, water stress

Received 29 June 2006; Revised 27 November 2006 Accepted 4 December 2006


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