干旱胁迫下根系功能的表达与调节

The Root Function Expression and Regulation under Drought Stress

根系不仅是吸收水分和养分的吸收器官,而且是产生干旱化学信号ABA的重要器官。干旱胁迫下,根系生长和生理功能受到显著影响。通过品种、灌溉和施肥对根系功能进行合理的调节可提高作物抗旱性。 世界范围的干旱问题日益严重,是制约农业生产的主要逆境因子。据统计,干旱造成的粮食减产位于各种自然灾害之首。因此,研究作物对干旱的生理响应规律和适应性一直是热点课题。长期以来,人们大多注意到植物地上部对干旱的生理反应,而对地下部根系的了解还相对较少。近年来人们认识到根系不仅仅是吸收水分和养分的吸收器官,而且能产生逆境根源信号,感知根部周围的环境变化。本文着重总结这方面的最新研究进展。

The root is not only the absorption organ for water and nutrition, but also important one for producing ABA, a chemical signal caused by drought. The drought stress significantly influences the function of growth and physiology in roots. The proper modulation of root function by culti-vars, irrigation and fertilization could improve the drought-resistance habit of crops.