Abstract:

  Abstract Responses of four genotypes wheat (Triticum aestivum L. ), Chinese spring, Nongda 85021 (salt sensitive genotypes) and Dong 68, Chadianhong(salt resistant genotypes) to salt stress and mitigative effects of salicylic acid on salt stress-induced injuries were studied during the stage of seed germination and seedling growth. The results showed that, during the stage of seed germination salicylic acid can markedly increase the germination ratio, germination index, vigor index of wheat. It was also found that in stage of seedling growth salicylic acid can relatively increase the contents of some osmotica, such as free proline and water dis-solved-carbohydrate and so on, 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 of salt stress in wheat were mitigated and salt res...更多

Key words:
Salt stress Salicylic acid Wheat (Triticum aestivum L. ) Seed germinationSeedling growth salt resistance  

摘要：

本文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(Triticum aestivum L.)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;提高幼苗体内游离脯氨酸、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

关键词: 盐分胁迫, 水杨酸, 小麦, 种子萌发, 幼苗生长, 抗盐性