Effect of Active Oxygen Metabolism on Photosynthesis of Avocado Seedlings under Water Stress
The dynamic changes of active oxygen metabolism of the leaf of avocado seedlings under water stress and their effect on photosynthesis were investigated. The results showed that water content of the leaves decreased slightly at the beginning of the stress period (0～2 days). However H2O2 and 1O2 were accumulated rapidly AsA and Car contents reduced MDA began to increase and the photosynthetic rate went down. With stress (3～10 days), leaf water content was significantly reduced O-.2 accumulated quickly with peak appearance the active oxygen scavenger content of enzyme system and non-enzyme system decreased evidently soluble proteins and photosynthetic pigments degraded greatly MDA content increased further and the photosynthetic rate dropped sharply and disappeared at day 6. These results suggested that the photosynthetic inhibition in avocado seedlings under water stress be related to accumulation of active oxygen.
国家科技期刊平台
NSTL
万方数据
维普
