Photosynthetic regulation of C 4 desert plant Haloxylon ammodendron under drought stress
作者： Peixi Su , Guodong Cheng , Qiaodi Yan , Xinmin Liu
DOI: 10.1007/S10725-006-9156-9
关键词:
摘要: About 20-year-old desert plants of C4 species, Haloxylon ammodendron, growing at the southern edge Badain Jaran Desert in China, were selected to study photosynthetic characteristics and changes chlorophyll fluorescence when subject a normal arid environment (AE), moist atmospheric conditions during post-rain (PR), artificial supplement soil water (SW). Results showed that under high radiation, AE, species down-regulated its net assimilation rate (A) maximum photochemical efficiency PS II (Fv/Fm), indicating photoinhibition. However, PR SW environments, A was up-regulated, with unimodal diurnal course small change Fv/Fm, suggesting no When air humidity or content increased, light compensation points reduced; saturation enhanced; while saturated CO2 (A max) apparent quantum yield (ΦC) increased. ΦC higher A max reduced relative treatment. It concluded high-radiation drought stress causes photoinhibition H. ammodendron. Increasing moisture can reduce increase solar energy use.
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