The Potential Effects on Microbiota and Silage Fermentation of Alfalfa Under Salt Stress

文献类型： 外文期刊

第一作者： Lu, Qiang

作者： Lu, Qiang;Sa, Duowen;Ge, Gentu;Wang, ZhiJun;Jia, Yushan;Wang, Zhen;Hou, Meiling

作者机构：

关键词： alfalfa; salt stress; silage; fermentation quality; microbial community

期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：6.064； 五年影响因子：6.843 ）

ISSN：

年卷期： 2021 年 12 卷

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收录情况： SCI

摘要： This study investigated the fermentation quality of alfalfa grown in different salt stress regions in China. Following the production of silage from the natural fermentation of alfalfa, the interplay between the chemical composition, fermentation characteristics, and microbiome was examined to understand the influence of these factors on the fermentation quality of silage. The alfalfa was cultivated under salt stress with the following: (a) soil content of <1 parts per thousand (CK); (b) 1-2 parts per thousand (LS); (c) 2-3 parts per thousand (MS); (d) 3-4 parts per thousand (HS). The pH of the silage was high (4.9-5.3), and lactic acid content was high (26.3-51.0 g/kg DM). As the salt stress increases, the NA(+) of the silages was higher (2.2-5.4 g/kg DM). The bacterial alpha diversities of the alfalfa silages were distinct. There was a predominance of desirable genera including Lactococcus and Lactobacillus in silage produced from alfalfa under salt stress, and this led to better fermentation quality. The chemical composition and fermentation characteristics of the silage were closely correlated with the composition of the bacterial community. Furthermore, NA(+) was found to significantly influence the microbiome of the silage. The results confirmed that salt stress has a great impact on the quality and bacterial community of fresh alfalfa and silage. The salt stress and plant ions were thus most responsible for their different fermentation modes in alfalfa silage. The results of the study indicate that exogenous epiphytic microbiota of alfalfa under salt stress could be used as a potential bioresource to improve the fermentation quality.

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