Effects of Drought Stress on Leaves and Photosynthesis of Kiwifruit
In order to explore the response mechanism of kiwifruit to drought stress during the growth period,the effects of four different degrees of drought stress on chlorophyll content,photosynthetic index,and physiological traits of kiwifruit leaves,as well as agronomic traits were investigated by using grafted three-year-old"jade"kiwifruit as test materials.The results show that with the deepening of stress degree and the extension of stress time,the relative chlorophyll content,net photosynthetic rate,transpiration rate,dry matter content,and water loss rate of kiwifruit leaves all decrease,and the ratio of leaf length-to-width and leaf area all decrease.The damage rate and thickness of kiwifruit leaves increase significantly.Ascorbic acid also increases significantly under moderate drought stress.The results of simulated drought stress in pots show that kiwifruit plants can maintain their basic growth requirements under mild drought stress,and once the stress exceeds the mild drought stress,the leaves begin to become yellow,wither,and fall off,while the indicators decrease after 15 days of severe drought stress.
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