Physiological and morphological responses of Leymus chinensis to saline-alkali stress
Physiological and morphological responses of Leymus chinensis to saline-alkali stress
复制标题
羊草对盐碱胁迫的生理和形态响应
DOI：
10.1111/grs.12099
复制
发表时间：
2015-12-01
影响因子：
1.3
通讯作者：
Bao, Guozhang
中科院分区：
文献类型：
--
作者：
Liu, Binshuo;Kang, Chunli;Bao, Guozhang
在这项研究中，土壤含有四个不同浓度的盐种植羊草，这是采样超过120天之间的春季开始和秋季结束。在此期间，它的生理和形态特征进行了分析。超氧化物歧化酶和甜菜碱含量在中度盐碱胁迫（A3）下达到最大值，Na+、脯氨酸、丙二醛（MDA）、有机酸（OAs）、过氧化氢酶、过氧化物酶、可溶性蛋白和可溶性总糖含量随着盐碱胁迫的增加而线性增加。而K+含量和K+/Na+比值显著降低。在盐碱胁迫下，叶片中的K+、甜菜碱、OA和可溶性蛋白含量高于根茎，而脯氨酸、MDA、保护酶和可溶性总糖含量低于根茎。节密度随盐碱胁迫的增加而变化，各节指数在A3时最大。盐碱胁迫下，根茎生物量、叶片生物量和根冠比均呈现先减小后增大的趋势，而根系生物量的变化则呈现相反的趋势，比根长逐渐增大。根冠比、比根长与各生理指标间存在显著相关性。结果表明，在不同程度的盐碱胁迫下，L.中华绒螯蟹可能采用一系列适应性生理和形态反应，其生理反应主要与生物量和能量的分配、根长以及地上和地下器官间生物量的分配有关。
In this study, soil containing four different concentrations of salt was used to grow Leymus chinensis, which was sampled over 120 days between the beginning of spring and the end of fall. During this time, its physiological and morphological characteristics were analyzed. Maximal superoxide dismutase and betaine content were observed under moderate saline‐alkaline stress treatment (A3), and with increasing saline‐alkaline stress, there was a linear increase in the contents of Na+, proline, malondialdehyde (MDA), organic acids (OAs), catalase, peroxidase, soluble protein and total soluble sugar. However, the K+ content and the K+/Na+ ratio decreased significantly. Under saline‐alkaline stress, the K+, betaine, OA and soluble protein levels in the leaves were higher than those in the rhizomes, whereas the proline, MDA, protective enzyme and total soluble sugar levels in the leaves were lower than those observed in the rhizomes. The node density varied with increases in saline‐alkali stress, and each node index was maximal at A3. Under saline‐alkali stress, the rhizome biomass, leaf biomass and root–shoot ratio first decreased and then increased, whereas the change in root biomass showed a contrary tendency, and the specific root length increased gradually. There was a significant correlation between the root–shoot ratio, specific root length, and the physiological indexes. These results show that under different degrees of saline‐alkali stress, L. chinensis is likely to use a series of adaptive physiological and morphological responses; the physiological responses were primarily related to the allocation of biomass and energy, root length, and the allocation of biomass between the aboveground and belowground organs.