裸苗移栽棉花缓苗期抗氧化酶活性和叶绿素含量的变化特点

 2007年在一熟棉田设裸苗移栽、钵苗移栽和直播3个处理，在麦棉两熟裸苗移栽棉田设置地膜覆盖和不覆盖两个处理，在移栽后40 d内分次取样测定棉花功能叶片的超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT) 活性和叶绿素含量。结果表明，移栽棉花由于移栽时根系受损，存在明显的缓苗期，缓苗期内功能叶片三种酶活性和叶绿素含量变化规律均表现为先升高而后下降或趋于平稳变化；CAT、POD较SOD对逆境的反应敏感，其活性当处于逆境时快速升高，逆境解除时就迅速下降；地膜覆盖有利于缩短移栽缓苗期，促进棉苗早发。

Study on Antioxidant Enzyme Activity and Chlorophyll Content in Nakedseedling Transplanting Cotton on Recovering Stage

The purpose of experiment was to study the antioxidant enzyme activity and chlorophyll contents in naked-seedling transplanting cotton on recovering stage. Three treatments were designed in single cropping field including directly sowed cotton，seedling raised with nutritive soil cube  and transplanted cotton, seedling raised with soilless-substrante and root-naked transplanted cotton. Two treatments including film-mulched, or no film-mulched were designed in double cropping system of wheat-cotton. SOD,POD and CAT activity, chlorophyll content in functional leaves were measured in 40 days after cotton was transplanted. The results showed that: transplanting cotton had distinct recovering stage because of the damaged roots during transplenting. During the recovering stage, SOD,POD and CAT activity,chlorophyll content in functional leaves were all going up at first, then descending or in a steady situation. CAT、POD were more sensitive to the negative environment than SOD, the activity went up quickly in the negative environment and went down quickly when the negative environment was relieved; film-mulched is beneficial to shorting the recovering stage and promoting the cotton seedling delivery early.