棉花生理性早衰研究进展

由于自身或外部原因使棉株在有效的生长季节内局部或整体提早结束生命而影响棉花产量和品质形成的现象即为早衰。早衰有病理性和生理性两种,皆表现为棉株体局部或整体过早衰败,经济性状受损。棉花生理性早衰既有品种原因,也与气候条件、土壤地力、肥水管理等外部因素等有关。结合现有研究,总结提出了生理性早衰成因的矿质营养失调说、库源失调说、激素失衡说和外源基因耗能说4种解释。

Research Progress in Physiological Premature Senescence in Cotton

A process in which the life of a whole or partial cotton plant terminates prematurely within the available growing season as a result of inherent or environmental factors is termed premature senescence. Premature senescence induced either pathologically or physiologically, appears to be an abnormal termination in a total or partial plant before maturity, which usually causes depressed economical parameters in cotton. A series of inherent or environmental factors are attributed to such senescence. Based on previous studies, four hypotheses including imbalances of source and sink, nutrition, endogenetic hormones, and energy consumption by the extrinsic gene for transgenic cotton were proposed to interpret the physiological mechanisms of premature senescence in cotton.