Strategy of endophytic bacterial communities in alfalfa roots for enhancing plant resilience to saline–alkali stress and its application

IF 5.1 1区 农林科学 Q1 SOIL SCIENCE
Dihe Yang, Lu Tang, Jiaxin Chen, Yimeng Shi, Hao Zhou, Hong Gao, Jian Jin, Changhong Guo
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Abstract

Soil salinization is an abiotic stress factor that can harm plant growth. Root endophytic bacteria may be associated with the resilience of plants to saline–alkaline stress. This study investigated the diversity, composition, and function of endophytic bacterial communities in alfalfa roots under saline–alkali stress, and screened a key bacterial strain associated with saline–alkali resistance. 16 S rRNA amplicon sequencing showed that high levels of saline alkalinity significantly reduced the diversity of endophytic bacterial communities and the relative abundance of beneficial bacterial taxa, such as Rhizobiales and Pseudomonas. Long durations of saline–alkali significantly decreased the abundance of predicted functional genes related to nitrogen metabolism in the alfalfa root endophytic bacterial community. Additionally, we isolated a key strain Pseudomonas with saline-alkali tolerance which could colonise roots and considerably improve physiological characteristics and plant growth. We found that colonization with Pseudomonas can considerably enhance plant resistance to saline-alkali stress and that the composition and function of the endophytic bacterial communities in roots likely contribute to plant tolerance to saline-alkali stress.

Abstract Image

苜蓿根部内生细菌群落增强植物抗盐碱胁迫能力的策略及其应用
土壤盐碱化是一种会损害植物生长的非生物胁迫因素。根部内生细菌可能与植物对盐碱胁迫的恢复能力有关。本研究调查了盐碱胁迫下紫花苜蓿根部内生细菌群落的多样性、组成和功能,并筛选出一种与抗盐碱能力相关的关键细菌菌株。16 S rRNA 扩增子测序表明,高盐碱度显著降低了内生细菌群落的多样性以及有益细菌类群(如根瘤菌和假单胞菌)的相对丰度。长时间的盐碱显著降低了苜蓿根部内生细菌群落中与氮代谢相关的预测功能基因的丰度。此外,我们还分离出了一株耐盐碱的关键假单胞菌,它能在根部定殖,大大改善生理特性和植物生长。我们发现,假单胞菌的定殖可大大增强植物对盐碱胁迫的抵抗力,根部内生细菌群落的组成和功能可能有助于植物对盐碱胁迫的耐受性。
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来源期刊
Biology and Fertility of Soils
Biology and Fertility of Soils 农林科学-土壤科学
CiteScore
11.80
自引率
10.80%
发文量
62
审稿时长
2.2 months
期刊介绍: Biology and Fertility of Soils publishes in English original papers, reviews and short communications on all fundamental and applied aspects of biology – microflora and microfauna - and fertility of soils. It offers a forum for research aimed at broadening the understanding of biological functions, processes and interactions in soils, particularly concerning the increasing demands of agriculture, deforestation and industrialization. The journal includes articles on techniques and methods that evaluate processes, biogeochemical interactions and ecological stresses, and sometimes presents special issues on relevant topics.
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