Genetic Variation in Salt Stress Response and Germplasm Resource Evaluation among <i>Lycium</i>Accessions

• 作者: Panpan Xu Wei An Yue Yin Yuejin Zhang Zixin Mu
• 来源期刊: 美国植物学期刊(英文)
• 学科: 数学
• 关键词: Lycium Germplasm Screening Salt Stress Ionic Homeostasis Genetic Diversity
• 年，卷（期）: mgzwxqkyw_2020,（11）
• 页码范围: 1765-1783
• 页数: 19页
• 分类号: O17

摘要

Genetic<span style="font-family:;" "=""><span style="font-family:Verdana;"> variation between naturally occurring ecotypes can be helpful to elucidate the mechanism controlling salt stress response in different environments. The salt stress response of 20 natural accessions or cultivars of </span><i><span style="font-family:Verdana;">Lycium</span></i><span style="font-family:Verdana;"> was characterized at a physiological level, following exposed to 300 mM NaCl for 15 days. It is shown that salt stress increased Na</span>^{<span style="font-family:Verdana;">+</span>}<span style="font-family:Verdana;">, betaine and malondialdehyde (MDA) content, as well as the relative permeability of plasma membranes, but decreased K</span>^{<span style="font-family:Verdana;">+</span>}<span style="font-family:Verdana;">, chlorophyll and glutathione (GSH) content, as well as K</span>^{<span style="font-family:Verdana;">+</span>}<span style="font-family:Verdana;">/Na</span>^{<span style="font-family:Verdana;">+</span>}<span style="font-family:Verdana;"> ratio compared with their respective control value in most of the varieties, though the increasing or decreasing extent has a clear genetic diversity. The physiological response was utilized to evaluate the salt-tolerant capacity of these varieties by principal component analysis and clustering analysis, and in which total chlorophyll, K</span>^{<span style="font-family:Verdana;">+</span>}<span style="font-family:Verdana;">/Na</span>^{<span style="font-family:Verdana;">+</span>}<span style="font-family:Verdana;"> ratio and partially GSH have the maximum weight relatively. These varieties could be categorized into four sub-groups, means greatly resistance (Heiguo, Ninqi No. 2 and Beifang), moderately resistant, sensitive, and mostly sensitive (Ninqi No. 7) to salt stress. Our results provide a theoretical basis and practical guidance for the </span><span><span style="font-family:Verdana;">improvement of saline-alkali land and rational u