光照诱导太子参叶片黄化的机制

研究旨在探讨太子参在大田种植过程发生的叶片黄化及植株凋亡与光照强度之间的关联,并进一步明确光照影响太子参叶片黄化和植株凋亡的机制.通过比较不同地域的田间太子参叶片黄化特性和气候因子差异,利用生化分析及显微观察研究不同光照强度、氮素水平对太子参叶片黄化及碳水化合物累积的影响,以揭示太子参叶片黄化的生理机制.对安徽宣城和贵...

Mechanism Underlying the Light-induced Leaf Chlorosis of Pseudostellaria heterophylla

This study aims to explore the correlation between light intensity and the leaf chlorosis of Pseudostellaria heterophylla, and further investigate the role of light intensity in mediating the leaf chlorosis and plant decay. The effects of light intensity and nitrogen level on the leaf chlorosis and carbohydrate accumulation in P. heterophylla were analyzed by biochemical analysis and microscopic observation to reveal the physiological mechanism underlying the leaf chlorosis of P. heterophylla. The differences of P. heterophylla leaf chlorosis characteristics and climatic factors between Xuancheng in Anhui and Zunyi in Guizhou were analyzed, which indicated that light intensity was an important factor affecting the leaf chlorosis of P. heterophylla. Field and greenhouse experiments showed that the extent of leaf chlorosis and the carbohydrate accumulation in P. heterophylla increased along with the increase of light intensity. Electron microscopic observation further suggested that the increase in light intensity could promote the enlargement of starch granules in chloroplasts, destroy the chloroplast structure, thus leading to leaf chlorosis in P. heterophylla. Increasing the nitrogen level could reduce the carbohydrate accumulation in P. heterophylla leaves and inhibit the light-induced leaf chlorosis. This study investigated the role of light and nitrogen in regulating leaf chlorosis of P. heterophylla, and could provide support to the agricultural practices in P. heterophylla cultivation.