热研5号四倍体与3种柱花草的耐盐性比较分析

Comparative Analysis of Salt Tolerance of Four Cultivars of Stylosanthes

柱花草是豆科柱花草属多年生草本植物,是优良的热带牧草。本试验采用盆栽法对热研5号四倍体、热研2号、热研5号及西卡4种柱花草进行盐胁迫处理,通过观测其在盐胁迫下的一系列生理生化反应,并通过综合评价得出其耐盐性强弱,实验结果表明,当盐质量百分比为0.90%时,各生理生化指标开始受到影响,盐质量百分比达1.20%时各生长指标开始受到明显的影响,盐质量百分比达到1.80%时,大部分幼苗受到严重的影响,开始死亡。综合各项指标表明:在所选4种柱花草中,西卡的耐盐性最强,热研5号四倍体次之,热研2号耐盐性最差,4种柱花草在盐质量百分比小于0.90%时均能良好生长,当盐质量百分比达到1.80%时难以生存,热研5号四倍体和二倍体的耐盐性没有明显差异。

Stylosanthes guianensis is a perennial herb plant,and belongs to the genus Stylosanthes,the family Leguminous,and it is an excellent tropical pasture.Four Stylosanthes cultivars,tetraploids of Reyan No.5,Reyan No.2,Reyan No.5,and Seca,were treated with salt in potting to observe their physiological and biochemical responses based on which a comprehensive assessment was made for their salt tolerance under salt stress.The results showed that the physiological and biochemical indexes of these cultivars were influenced by the salt concentration of 0.90%,and that the growth indexes were influenced by the salt concentration of 1.20%.Most seedlings were seriously influenced and died when treated with salt at the concentration of 1.8%.Comprehensive analysis indicated that Seca showed the strongest salt tolerance,followed by the tetraploids of Reyan No.5,and that Reyan No.2 was the weakest in salt tolerance.All plants of the Stylosanthes cuhivars grew well when treated with salt at the concentration of lower than 0.90%,but hardly survived when treated with salt at the concentration of 1.80%.Meanwhile,there were no obvious differences between tetraploid and diploid of Reyan No.5.