水杨酸对小麦高盐毒害的缓解作用

以盐敏感品种中国春、农大８５０２１和抗盐品种冬６８、茶淀红等４个品种小麦（ＴｒｉｔｉｃｕｍａｅｓｔｉｖｕｍＬ．）为材料，研究盐分胁迫对小麦种子萌发和幼苗生长的影响以及水杨酸对盐害的缓解作用．结果表明，水杨酸能够相对提高盐分胁迫条件下小麦种子萌发的数量、速度和质量；提高幼苗根和叶内游离脯氨酸、可溶性糖等渗透调节物质的含量，增强其渗透调节能力，同时提高幼苗体内超氧化物歧化酶、过氧化物酶等细胞保护酶的活性，抑制膜脂过氧化作用产物丙二醛的积累，降低叶片质膜透性和盐分胁迫对细胞膜的伤害．所有这些变化都有利于缓解盐害，提高小麦抗盐性

EFFECT OF SALICYLIC ACID ON SALT-RESISTANCE OF WHEAT (TRITICUM AESTIVUM L.)

Four wheat genotypes ( Triticum aestivum L.), Chinese Spring, Nongda 85021(salt sensitive genotypes) and Dong 68 and Chadianhong(salt resistant genotypes) were used to study the effect of salt stress on seed germination and seedling growth, and also the mitigative effects of salicylic acid salt stress induced injuries. The results showed that at the stage of seed germination application of salicylic acid could increase the germination rate, germination index and vigor index of wheat. It was also found that at the stage of seedling growth application of salicylic acid could increase the contents of some osmotica, such as free proline and water dissolved carbohydrate, promote the activity of membrane protective enzymes, superoxide dismutase and peroxidase, delay the accumulation of malon dialdehyde, and decrease the leaf relative electronic conductivity and salt stress induced injuries of plasma membrane. Therefore the injuries induced by the salt stress were mitigated and salt resistance of wheat was raised.