不同干旱脅迫對煙草葉片保護酶活性的影響

Effects of Drought Stress on Activity of Cell Defense Enzymes in Flue-cured Tobacco Leaves

摘要: 利用大型防雨棚進行人工控水,，研究春旱,、伏旱和持續(xù)輕度干旱脅迫對烤煙三大保護酶活性的影響。結果表明,，在各種干旱脅迫下,，隨著脅迫時間的持續(xù)，超氧化物歧化酶（SOD）活性呈先增加后降低的趨勢,；春旱,、持續(xù)干旱脅迫下過氧化物酶（POD）和過氧化氫酶（CAT）活性呈“增加-降低-增加”的趨勢，而伏旱脅迫處理POD和CAT活性則呈先增加后降低的趨勢,。3 種處理中,，伏旱處理對三大保護酶活性影響最大。

Abstract: Using large waterproof installations to regulate different soil water contents strictly, we studied effects of spring drought,summer drought and sustained mild drought on the activity of cell defense enzymes in flue-cured tobacco leaves. The results indicated that the superoxide dismutase (SOD) activity increased first and then declined under all kinds of drought stress, the activity of peroxdase (POD) and catalase (CAT) showed a trend of increasing-declining-increasing under spring drought and sustained mild drought, while increasing first and then declining under summer drought. The activity of cell defense enzymes was most affected by summer drought during three treatments.