2种不同基因型玉米苗期盐胁迫反应及耐盐性研究

以2种不同基因型玉米(普通玉米WXWX和糯玉米wxwx)为材料,用浓度为250mmol/L NaCl进行盐胁迫处理,考察玉米发芽势、发芽率、幼苗期不同生长阶段的株高(6、10d和14d)、鲜重和干重(14d)变化率,研究玉米种质苗期的盐胁迫反应,对玉米种质进行耐盐性鉴定。结果表明:玉米对盐胁迫较敏感,盐胁迫下发芽势、株高、鲜重和干重受到显著抑制;不同材料间耐盐性存在明显差异,10d株高、14d株高、鲜重和干重变化率能一致地反映出不同材料的耐盐性;通过筛选鉴定,18份材料中,‘通系5’(wxwx)和‘4A’(WXWX)为较耐盐的玉米自交系,‘苏玉947’(WXWX)和‘登海9号’(WXWX)为较耐盐的玉米单交种。

Response of two different-genotype maize at seedling stage to salt stress and evaluation of their salt tolerance

Two different-genotype maize(ordinary maize-WXWX and waxy maize-wxwx)were used as test materials,and their seeds’ germination vigor and germination rate,their plant height at 6,10 and 14 days and their fresh/dry plant weight at 14 days were investigated under 250 mmol/L NaCl stress in order to study the response of the seedling-stage maize to salt stress and test for the salt tolerance of maize materials.The results showed that maize was sensitive to salt stress,and the germination vigor,plant height and fresh/dry plant weight were significantly depressed under salt stress;Various maize materials had significantly different salt tolerances which could be reflected conformably by the change rates of 10 d or 14 d plant height and 14 d fresh/dry plant weight.The tests indicated that among the 18 maize materials ’Tongxi 5’(wxwx)and ’4A’(WXWX)were relatively salt-tolerant inbred lines,and ’Suyu 947’(WXWX)and ’Denghai 9’(WXWX)were relatively salt-tolerant interlinear hybrids.