Effects of salt stress levels on nutritional quality and microorganisms of alfalfa-influenced soil

作者：Qiang Lü, GenTu Ge, Duowen Sa, Zhijun Wang, Meiling Hou, Yu Shan Jia · 发表于：PeerJ · 年份：2021 · DOI：10.7717/peerj.11729 · 被引用次数：54 · 研究领域：Soil Carbon and Nitrogen Dynamics、Plant Stress Responses and Tolerance、Plant responses to water stress

Background Globally, there is a large amount of salinized land. These soils have varying degrees of salt stress, causing ionic toxicity and osmotic stress on plants. However, it is not clear how different degrees of salt stress affect plant nutrients and microbial communities. Thus, a comprehensive understanding of plant major nutrients and microbial communities response to salt stress is desirable. Results We analyzed the main nutrients of the salt-tolerant ZhongMu No. 3 alfalfa variety planted in a salt stress environment. In mild and moderate group, the protein content and fatty acid content of alfalfa were the highest, indicating the best nutritional value. The severe group of salt stress affected the growth and development of alfalfa, as manifested by a decrease in the nutritional quality of alfalfa. Pseudomonas and Sphingobacterium that from alfalfa stem and leaf endophytes also increased with an increase in salt stress. In contrast, Sphingomonas , Methylobacterium , and Rhizobium decrease with increasing salt stress. Methylobacterium and Rhizobium have extremely significant differences in response to salt stress, and Exiquobacterium also shows significant differences. Conclusions Soil salinity would be an important factor beyond which alfalfa nutrient quality and microbial community structure change. This study identified key levels of salt stress that may affect the nutrient quality and microbial community structure. These findings enhance our understanding of the eff...