4种牧草苗期耐盐性比较

Comparison of salinity tolerance of four herbages at the seedling stage

用不同NaCl溶液分别对梭罗草(Roegneria thoroldiana)、碱茅(Puccinellia distans)、中华羊茅(Festucasinensis)和垂穗披碱草(Elymus nutans)进行胁迫处理,研究它们在不同质量分数的NaCl胁迫下植物组织受伤害程度、叶片的叶绿素、可溶性糖、可溶性蛋白质、游离脯氨酸的含量及过氧化物酶、过氧化氢酶活性的变化。结果表明,在盐质量分数为0.2%时,4种供试牧草的抗盐性依次为碱茅>中华羊茅>梭罗草>垂穗披碱草;在质量分数为0.4%～1.0%时,抗盐性依次为碱茅>梭罗草>中华羊茅>垂穗披碱草。

In order to understand salinity tolerance of 4 herbages,seedlings of Roegneria thoroldiana,Puccinellia distans,Festuca sinensis and Elymus nutans were treated with different concentrations of NaCl solution;and the plant tissues damage degree,contents of chlorophyll,soluble sugar,soluble protein,free proline（Pro） and activities of peroxidase（POD）,catalase（CAT） in the seedlings were measured after 7 day treatments.Results showed that the order of salt resistance of the four herbages was P.distansF.sinensisR.thoroldianaE.nutans with the 0.2% of NaCl solution treatment.However,when the salt concentration increased to 0.4%~1.0%,the trend of salt resistance from strong to weak was P.distans,R.thoroldiana,F.sinensis and E.nutans.