铝胁迫下柠檬酸对多年生黑麦草种子萌发和幼苗生理特性的影响

Effects of citric acid on germination and seedlingphysiological characteristics of perennialryegrass under aluminum stres

摘要:

为探究柠檬酸处理对多年生黑麦草铝毒害的缓解作用,以多年生黑麦草品种维多利亚为试材,采用培养皿滤纸发芽法,研究柠檬酸不同浓度(0.2,0.5,0.8,1.1,1.5mmol/L)对250mg/L和500 mg/L浓度铝胁迫下多年生黑麦草种子萌发和幼苗特性的影响。结果表明:柠檬酸不能提高铝胁迫下多年生黑麦草的发芽势、发芽率及发芽指数,但能促进铝胁迫下其地上部分以及地下部分的生长,同时还能提高幼苗叶片SOD活性,使其 MDA 含量和相对电导率下降,柠檬酸浓度为0.8mmol/L时对缓解铝胁迫对多年生黑麦草的毒害作用最适宜。

Abstract:

In order to investigate the mitigation effect of citric acid treatment on aluminum toxicity in perennialryegrass,perennial ryegrass ‘Victoria’ was used as a test material to study the seed germination and seedlingcharacteristics treated with different concentrations (0.2,0.5,0.8,1.1,1.5 mmol/L) of citric acid under250 mg/L and 500mg/L of aluminum stress by using the culture dish filter paper germination method.The resultsshowed that citric acid could not increase the germination potential,germination rate and germination indexunder aluminum stress,but it could promote the growth and SOD activity,decrease MDA content and relativeconductivity of seedling leaf.In general,the addition of exogenous citric acid could alleviate the toxicity of aluminumstress on perennial ryegrass to a certain extent