干旱环境对罗望子水分生理的影响

Effects of drought environment on water physiology of Tamarindus indica

罗望子(Tamarindusindica)是抗逆性较强的树种,适应于干热河谷生长。为了探讨其抗逆机理,研究了干旱环境对罗望子树体水分生理的影响。结果表明,当植物在干旱季节,植物体内束缚水含量大于自由水含量导致植物代谢缓慢,同时,植物体内脯氨酸含量升高,对植物起保护作用。研究还发现,植物体内水分下降,脯氨酸含量上升时期晚于大气干旱、土壤干旱时期。因此,在栽培管理方面,人工补灌的时间应与大气干旱的时间同步,以免造成土壤干旱,导致植物严重缺水而影响生长。

Tamarind tree was strongly tolerant to stress environment and can grow in dry and hot surrounding. To explore the mechanism of stress tolerance.The effects of drought on tamarind tree in water physiology were analyzed. The result indicated that, under drought stress, confined-water content was higher than free-water content, which leaded to the decrease of metabolic process of plant. Meanwhile, the free proline content sharply increased so as to protect plant and make the tree tide over drought season. The results also showed that the time of the decrease of water and the increase of free proline content was later then that of atmosphere and soil drought. Therefore, in cultivation and mangagement, the time of supplement irrigation should be in-phase with atmospheric drought, so that the tree was not seriously harmed by lacking of water, and grew normally.