水稻拔节期水分胁迫及复水对叶片叶绿体色素的影响

通过盆栽试验,对水稻拔节期不同程度、不同历时的水分胁迫及复水后叶片叶绿体色素含量变化及其机理进行了研究.结果表明:胁迫历时对叶绿体色素的影响大于胁迫程度对叶绿体色素的影响.短历时(5 d)胁迫会增加叶绿素含量,复水后会降低叶绿素含量,且重度胁迫复水后对叶绿素的补偿效应强于轻度胁迫复水后对叶绿素的补偿效应;长历时(10 d)胁迫会降低叶绿素含量,复水后会增加叶绿素含量,且轻度胁迫复水后对叶绿素的补偿效应强于重度胁迫复水后对叶绿素的补偿效应.水分胁迫会增加叶绿素a与b的质量比,复水后会降低叶绿素a与b的质量比.类胡萝卜素含量的变化趋势与叶绿素含量的变化趋势一致.

Effects of water stress and rewatering at shooting stage of rice on chlorophyll pigments in leaves

Pot experiments were performed for study of the variation mechanism of chlorophyll pigments in rice leaves at different grades and for different durations of water stress after rewatering.Some conclusions are drawn: the duration of water stress is of greater effect on chlorophyll pigment than the grade of water stress;the water stress of short duration((5?d))leads to the increase of content of chlorophyll,while rewatering reduces the content of chlorophyll,and the compensation effect on chlorophyll by rewatering at high-grade water stress is greater than that at low-grade water stress;long duration((10?d)) of water stress decreases the chlorophyll content,while it is increased after rewatering,and the compensation effect on chlorophyll content by rewatering at low-grade water stress is greater than that at the high-grade water stress;water stress increases the ratio of chlorophyll a and chlorophyll b,while rewatering decreases the ratio;the variation of carotenoid content accords with that of chlorophyll content.