应用生态学报2011，Vol.22Issue(3)：707-712,6.
低氧胁迫下黄瓜植株热耗散途径
Thermal dissipation pathway in cucumber seedling leaves under hypoxia stress
摘要
Abstract
A water culture experiment was conducted to study the relationship between photosynthetic thermal dissipation and xanthophyll cycle in cucumber seedling leaves under hypoxia stress (the dissolved oxygen concentration in nutrient solution was 0. 9-1. 1 mg • L-1). Under the hypoxia stress, there was a significant decrease in the quantum yield of PS Ⅱ photochemistry rate (ΦPS Ⅱ ) , net photosynthetic rate (Pn) under saturation light intensity, quanta yield (AQY) , and maximal photochemical efficiency ( FV/Fm ) , suggesting that the photoinhibition of the seedling leaves was induced. Meanwhile, the thermal dissipation ( NPQ) and the allocation of dissipation energy (D) by antenna increased, but the photochemical quenching apparent (qP) decreased, suggesting the enhancement of thermal dissipation in cucumber leaves under hypoxia stress. A positive correlation was observed between NPQ and xanthophyll de-epoxidation state ( DEPS) , and both of them were promoted by ascorbic acid (AsA) and inhibited by 1,4-dithiothreitol (DTT) , suggesting that xanthophyll cycle was the major pathway of photosynthetic thermal dissipation in cucumber seedling leaves under hypoxia stress.关键词
低氧胁迫/黄瓜/光抑制/叶黄素循环分类
农业科技引用本文复制引用
贾永霞,孙锦,王丽萍,束胜,郭世荣..低氧胁迫下黄瓜植株热耗散途径[J].应用生态学报,2011,22(3):707-712,6.基金项目
国家重点基础研究发展计划项目(2009CB119000)、国家自然科学基金项目(30871736,31071831)和现代农业产业技术体系建设专项(Nycytx-35-gw18)资助． （2009CB119000）
