不同盐浓度下3种结缕草的耐盐性比较研究

A comparison of salt resistance of three kinds of Zoysiaat different salt concentrations

以大穗结缕草、沟叶结缕草和日本结缕草为试材,研究了不同浓度NaCl(0.20%,0.40%,0.60%,0.80%)处理40d后对3种草坪草叶片中保护酶(POD,SOD,CAT)活性、丙二醛、脯氨酸、叶绿素及可溶性蛋白含量的影响,以确定各自的耐盐性强弱。结果表明,随盐浓度增加,3种草坪草叶片中的保护酶活性、丙二醛、脯氨酸含量呈上升趋势。在0.80%盐浓度下,大穗结缕草叶片中的保护酶活性较高而丙二醛、脯氨酸含量较低;低盐浓度下(<0.40%),3种草坪草叶片的叶绿素含量、可溶性蛋白含量随盐浓度升高而升高,高盐浓度下(>0.60%),随盐浓度升高而下降。在0.80%盐浓度下,大穗结缕草叶片的叶绿素及可溶性蛋白含量较高且下降值较小。表明大穗结缕草具有较高的耐盐性。

To determine the difference in salinity resistance of Zoysia species, Z. macrostachya, Z. metrella and Z. japonica were used to study the effects on leaf protective enzymes （POD, SOD, CAT）, MDA, proline, chlorophyll, and soluble protein content under different salinity treatments （0, 0.20%, 0.40%, 0.60% and 0.80%） after a 40 days incubation. As the salt concentration increased, the changes in activities of leaf protective enzymes and the proline content increased. At 0.80 % salt concentration, leaf protective enzymes of Z. macrostachya had higher activity and lower MDA and proline contents. At lower salt concentrations （〈0.40%）, as the salt concentration increased, the total chlorophyll content and the soluble protein content of all Zoysia species increased, while they decreased at higher concentrations （〉0.60%）. At 0.80% salt concentration, the total chlorophyll and soluble protein contents of Z. macrostachya were higher, and the decline was smaller than in the other Zoysia species. This showed that Z. macrostachya had the highest salt resistance of the three Zoysia species.