摘要： 为研究外源钙对棉花抗旱性的作用机理,利用控制溶液渗透势(含和不含0.2 kg/L PEG-6000)与不同钙量的方法研究了正常水分和干旱胁迫下钙素对棉花幼苗的生理影响。结果表明,在相同硝酸钙条件下,干旱胁迫下棉花幼苗叶片膜透性、超氧自由基产生速率、MDA和POD活性高于正常水分,而叶片相对含水量和根系活力低于正常供水;无论在正常水分还是干旱胁迫下,均表现出随Ca2+浓度增加,叶片膜透性、超氧自由基产生速率、MDA呈下降趋势,叶片相对含水量和根系活力及POD活性呈上升趋势,但正常供水条件下生理指标变化较小。

关键词: 干旱胁迫, 外源钙, 棉花幼苗, 生理指标

Abstract: "The effect of calcium on physiological role of cotton seedling were studied under normal water and drought stress conditions by controlling the osmotic potential(adding and without 0.2 kg/L PEG-6000) and adding different Ca(NO3)2 in the solution in order to study the mechanism of exogenous calcium on drought resistance in contton seedling.The results indicated that with same Ca2+ level,under drought stress content condition,the plasma membrane permeability,O-2 production rate and malondialdehyde(MDA) and peroxidase(POD)activity were much higher than the normal water providing,while the relaive water content of leaves and the root activity were much lower than the normal water.the plasma membrane permeability,O-2 production rate,MDA and POD activity showed decreasing trend,while the relaive water content of leaves and the root activity showed an increasing trend with the Ca2+ amount increased in both normal water and drought stress conditions,but physiological role under normal water supplying was changed smaller than that under drought stress. "

Key words: Drought stress, Exogenous calcium, Cotton seedling, Physiologica lindexes

中图分类号: 

• S562