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《Plant Science Journal》 2018-05
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Morphological and physiological responses of Ardisia crenata seedlings under different light intensities

Xiong Jing;Wang Chen;Xing Wen-Li;Yu Mu-Kui;Cheng Xiang-Rong;Zhang Cui;East China Coastal Forest Ecosystem Research Station,Research Institute of Subtropical Forestry,Chinese Academy of Forestry;Rushan Forestry Bureau;  
Changes in the morphology,biomass,and physiology of Ardisia crenata seedlings were studied under different light environments( 100%,52%,33%,15%,and 6% relative light intensities). Results showed that the biomass of individual A. crenata seedlings was significantly higher under 52% light treatment than that under other treatments. The proportion of biomass allocated to leaves under 15%-52% light treatment was also higher than that under 100% and 6% light treatment. The root shoot ratio was not affected by light intensity,indicating that the structural plasticity of A. crenata was relatively low. The concentrations of nitrate increased with the decrease in light intensity and increased significantly under 6% light treatment. The change in nitrate reductase activity with light intensity was consistent with the change in nitrate content. Furthermore,the A. crenata seedlings adapted to different light environments by changing the leaf area and specific leaf area and by regulating thephotosynthetic pigment. Analysis of chloroplast ultrastructure also showed that chloroplast number and cellular structure under 15%-52% light treatment were intact. However,under100% and 6% light treatment,the number of the chloroplasts decreased significantly,the cellular structure was damaged, and plasmolysis occurred. Therefore, the most suitable growth conditions for A. crenata seedlings were under 15%-52% relative light intensities,though the best growth was achieved under 33%-52% relative light treatment.
【Fund】: 国家重点研发计划项目(2017YFC0505500 2017YFC0505502);; 浙江省中国林科院合作重点项目(2014SY01)~~
【CateGory Index】: S686
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