Photoinhibition and Assimilate Distribution in Two-line hybrid Rice (Oryza sativa L.) PA64S/E32 at Late Development Stage

Abstract

Abstract: Using hybrid rice PA64S/E32 and Shanyou63 as materials, chlorophyll fluorescence parameters , assimilate distribution and other key indexes were assayed under natural condition. Compared with that of Shanyou63, the decrement of contents of chlorophyll and protein, PSⅡprimary photochemical efficiency（Fv/Fm）, photon yield (φPSⅡ) and photochemical quenching coefficient (qP) were less; increment of non-photochemical quenching coefficient（qN）and Fo were less in two-line hybrid rice PA64S/E32 at noon (high light intensity and temperature) and during leaf senescence. Transport rate and distribution ratio of photosynthetic assimilate to ear were all-higher, which indicated that PA64S/E32 has better coordination of source-sink in terms of the studies on photosynthetic assimilate using isotope. The above photosynthetic characteristics and assimilate distribution is possibly the physiological basis of high yield in two-line hybrid rice PA64S/E32.

Zhang Yunhua, Chen Lijuan, Wang Rongfu, Chen Bingsong, Ding Biao, Wu Hai. Photoinhibition and Assimilate Distribution in Two-line hybrid Rice (Oryza sativa L.) PA64S/E32 at Late Development Stage[J]. Chinese Agricultural Science Bulletin, 2006, 22(4): 276-276.

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