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草业学报  2015 

油菜素内酯对干旱胁迫下羊草渗透调节及抗氧化酶的影响研究

DOI: 10.11686/cyxb2015001, PP. 93-102

Keywords: 油菜素内酯(BR),羊草,干旱胁迫,渗透调节,抗氧化酶

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Abstract:

受全球气候变化影响,我国牧区干旱现象日益严重,极大限制了草原生产力的提高。本文采用盆栽人工控水的方法,研究不同浓度油菜素内酯(BR)处理对羊草生长和抗旱特性的影响。结果表明干旱显著抑制植株的生长,而BR能有效减缓干旱胁迫对羊草造成的伤害。经过不同浓度的BR处理后,与干旱胁迫相比,株高、叶面积、干重、含水量、叶绿素a、叶绿素b、类胡萝卜素、根系活力、脯氨酸、可溶性蛋白、可溶性糖和5种抗氧化酶活性均随浓度增加而升高,但高浓度下又有降低的趋势,而丙二醛(MDA)和叶片电导率则相反,其中以BR浓度为0.1mg/L时的抗旱效果最好。研究发现适当浓度的BR提高羊草株高、叶面积和光合色素含量,促进干物质积累和根系活力,与其降低膜脂过氧化产物MDA与质膜透性,提高脯氨酸、可溶性蛋白、可溶性糖等渗透调节物质含量,增强超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)、抗坏血酸过氧化物酶(APX)、谷胱甘肽还原酶(GR)等抗氧化酶活性密切相关。

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