灌浆期干旱胁迫对玉米叶片关系统活性的影响

doi:10.3724/SP.J.1006.2009.01916

Abstract

Abstract:

At grain filling stage, the effects of drought stress on photosynthetic acivities of photosystem I (PS I) and photosystem II (PS II) in leaves of maize (Zhengdan 21, a cultivar with high starch content) were studied by simultaneously analyzing chlorophyll a fluorescence transient and light absorbance at 820 nm. The results, obtained from two years experiments, demonstrated that the drought stress significantly reduced photosynthesis (P<0.05) and grain yield (P<0.05) of the maize. The K and J steps at fluorescence transient were increased by drought stress, which indicated the inhibition of oxygen- evolving complex (OEC) and electron transport chain after Q_A in PS II. The acceptor side of PSII was damaged more severely than the donor side of PSII. Furthermore, the maximal oxidation-reduction activity of PS I (ΔI/I_o) was also significantly decreased by the drought stress, which inhibited the photosynthetic electron tranport from the PS II to PS I, destructing the coordination between PS I and PS II. We suggest that the inhibition of PS I and PS II and the destruction of the coordination between PS I and PS II by the drought stress is one of the main reasons to cause the decrease in photosyntheis and grain yield of maize.

Key words: Maize, Drought stress, Chlorophyll a fluorescence transient, Maximal oxidation-reduction activity of PS I, 820 nm light absorbance

LI Geng,GAO Hui-Yuan,ZHAO Bin,DONG Shu-Ting,ZHANG Ji-Wang,YANG Ji-Shun,. Effects of Drought Stress on Activity of Photosystems in Leaves of Maize at Grain Filling Stage[J].Acta Agron Sin, 2009, 35(10): 1916-1922.

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Effects of Drought Stress on Activity of Photosystems in Leaves of Maize at Grain Filling Stage

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