羊草对盐碱胁迫的生理生化响应特征

研究羊草对盐碱胁迫生理响应特征,旨在找出羊草耐盐碱范围及其对盐碱地改良的应用潜力。通过模拟5组不同盐碱梯度土壤胁迫试验（p H值为7.61、8.05、8.33、8.73、9.37,电导率为0.109、0.301、0.437、0.486、0.591 m S/cm）,研究了羊草体内离子含量和运输能力、有机小分子渗透调节和保护酶活性变化。结果表明,盐碱胁迫由低到高,超氧化物歧化酶和甜菜碱在中度盐碱胁迫（p H值8.33,电导率0.437 m S/cm）积累最多,其他测定的耐盐碱物质,钠离子、脯氨酸、丙二醛、有机酸（草酸、柠檬酸、酒石酸）、过氧化物酶、过氧化氢酶、可溶性总糖、可溶性蛋白均呈直线增加。在...

Full description

Saved in:
Bibliographic Details
Published in农业工程学报 Vol. 30; no. 23; pp. 166 - 173
Main Author 刘滨硕 康春莉 王鑫 包国章
Format Journal Article
LanguageChinese
Published 吉林大学环境与资源学院地下水资源与环境教育部重点实验室,长春,130021 2014
Subjects
土壤
抗氧化酶
渗透调节
生化
盐分
盐碱胁迫
离子调节
羊草
抗氧化酶
saline-alkali stress
osmotic adjustment
离子调节
渗透调节
土壤
ion adjustment
羊草
antioxidant enzyme
biochemistry
盐分
生化
Leymus chinensis
盐碱胁迫
soils
salts
Online AccessGet full text
ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2014.23.021

Cover

More Information
Summary:研究羊草对盐碱胁迫生理响应特征,旨在找出羊草耐盐碱范围及其对盐碱地改良的应用潜力。通过模拟5组不同盐碱梯度土壤胁迫试验（p H值为7.61、8.05、8.33、8.73、9.37,电导率为0.109、0.301、0.437、0.486、0.591 m S/cm）,研究了羊草体内离子含量和运输能力、有机小分子渗透调节和保护酶活性变化。结果表明,盐碱胁迫由低到高,超氧化物歧化酶和甜菜碱在中度盐碱胁迫（p H值8.33,电导率0.437 m S/cm）积累最多,其他测定的耐盐碱物质,钠离子、脯氨酸、丙二醛、有机酸（草酸、柠檬酸、酒石酸）、过氧化物酶、过氧化氢酶、可溶性总糖、可溶性蛋白均呈直线增加。在盐碱胁迫条件下,羊草叶片中积累的钾离子、甜菜碱、有机酸、可溶性蛋白高于根茎,而脯氨酸、丙二醛、保护酶（超氧化物歧化酶、过氧化物酶、过氧化氢酶）、可溶性总糖叶片中含量低于根茎。根茎大量积累保护酶、脯氨酸及丙二醛有助于防止盐碱环境下根茎中膜过氧化,并保持根茎正常的渗透调节能力,从而有利于将K＋等养分运送到叶片。在盐碱胁迫下,羊草叶片主要积累甜菜碱和有机酸进行渗透调节。该试验结果表明,羊草根茎和叶片在不同盐碱胁迫条件下各耐盐碱生理指标均产生一系列适应性反应,使其在盐碱环境正常生长,进而降低土壤盐碱性。该研究可为耐盐碱饲草选育及根茎型禾草改良盐碱化草地提供理论和实践依据。
Bibliography:11-2047/S
Salinization of grassland is one of the main causes of the degeneration of Leymus chinensis grassland in north-eastern part of China. In this study, we sampled L. chinensis as experimental materials, simulated in five soil stresses under different salinization gradient intensity（p H values were 7.61, 8.05, 8.33, 8.72, 9.37, the corresponding electrical conductivity were 0.109, 0.301, 0.438, 0.486, 0.591 d S/m） during a 120-day period from the beginning of spring to the end of fall. Then we measured ion content and transport capacity, osmotic adjustment of small organic molecules and the change of protective enzymatic activities to understand the range and the mechanism of L. chinensis adapting to saline-alkali stress. The results illustrated that with the increase of saline-alkali stress, superoxide dismutase（SOD） and betaine were accumulated to the maximum under moderate saline-alkaline stress A3. The content of Na＋, proline, malonaldehyde（MDA）, organic acids（oxalic acid, citric acid, tartaric acid）
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2014.23.021