Photosynthetica 2004, 42(4):573-578 | DOI: 10.1007/S11099-005-0015-0

Effects of drought on photosynthetic characteristics of flag leaves of a newly-developed super-high-yield rice hybrid

G. X. Chen1,*, S. H. Liu1, C. J. Zhang1, C. G. Lu2
1 College of Life Sciences, Nanjing Normal University, Nanjing, P.R. China
2 Jiangsu Academy of Agricultural Sciences, Nanjing, P.R. China

We investigated responses of chloroplasts from flag leaves of a newly-developed super-high-yield rice (Oryza sativa L.) hybrid LiangYouPeiJiu (LYPJ) to water stress (withholding irrigation) during the grain-filling period. In the early stage of water stress (0-6 d) only the activity of Hill reaction was inhibited, whereas activities of photophosphorylation and Ca2+-ATPase, and ATP content were increased and peaked in the day 6 of withholding irrigation. In the late stage of water stress (6-12 d), the activities of photosynthetic O2 evolution, Hill reaction, photophosphorylation, and Ca2+- ATPase, and ATP content were significantly reduced. The membrane lipid content was sharply decreased, especially of sulfoquinovosyl-diacylglycerol (SQDG) and phosphatidylglycerol (PG). The changes in the ultrastructure of chloroplasts included mainly a decrease in number of grana and increase in number of osmiophilic granules.

Additional key words: chloroplast ultrastructure; Hill-reaction; Oryza sativa; photophosphorylation; photosynthetic O2 evolution; membrane lipids; water stress

Received: February 16, 2004; Accepted: May 7, 2004; Published: December 1, 2004  Show citation

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Chen, G.X., Liu, S.H., Zhang, C.J., & Lu, C.G. (2004). Effects of drought on photosynthetic characteristics of flag leaves of a newly-developed super-high-yield rice hybrid. Photosynthetica, 42(4), 573-578. doi: 10.1007/S11099-005-0015-0
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