干旱对不同铃重基因型棉花叶片细胞膜伤害、保护酶活性及产量的影响

 研究水分胁迫对棉花叶片细胞膜伤害、保护酶活性及产量的影响。结果表明，在水分胁迫下，各棉花品种各部位果枝叶片中MDA含量明显增加，增加幅度因品种、时期和植株部位不同差异较大，其中，以中铃品种果枝叶片中MDA含量增加幅度最小。水分胁迫下各品种、各部位果枝叶片SOD、POD酶活性在棉铃发育的多数时期都明显升高，其中上、中部果枝叶SOD酶活性在棉铃30 d日龄时最低，并且这一规律不因品种类型和果枝区位而改变；中铃品种上部和下部果枝叶SOD酶活性在干旱胁迫下增加的幅度大于大铃和小铃品种；就不同区位果枝叶各时期总体情况而言，以中部POD酶活性最高，下部次之，上部最低。干旱胁迫下中铃品种的铃重和产量变化幅度最小，表现出较强的耐旱性。

Effects of Drought on Cell Membrane Damage,Activities of Protective Enzymes and Yield of Different Boll-weight Genotypes in Cotton

The effects of water stress on cell damage,activities of protective enzymes and yield of different boll-weight genotypes in cotton were studied.The result showed that: under water stress,the content of MDA in these genotypes increased significantly according to both each genotype and each position and the increasing extent varied greatly with genotypes,stages and positions.Among the three species,the middle-boll genotype increased the least under water stress,the activities of SOD and POD increased at diffe...