干旱区生态环境知识资源中心(Arid): Comparative Analysis of Plant Growth-Promoting Rhizobacteria's Effects on Alfalfa Growth at the Seedling and Flowering Stages under Salt Stress

Arid

DOI	10.3390/microorganisms12030616
	Comparative Analysis of Plant Growth-Promoting Rhizobacteria's Effects on Alfalfa Growth at the Seedling and Flowering Stages under Salt Stress
	Ma, Xixi; Huang, Cuihua; Zhang, Jun; Pan, Jing; Guo, Qi; Yang, Hui; Xue, Xian
通讯作者	Xue, X
来源期刊	MICROORGANISMS
EISSN	2076-2607
出版年	2024
卷号	12 期号:3
英文摘要	Alfalfa (Medicago sativa L.), a forage legume known for its moderate salt-alkali tolerance, offers notable economic and ecological benefits and aids in soil amelioration when cultivated in saline-alkaline soils. Nonetheless, the limited stress resistance of alfalfa could curtail its productivity. This study investigated the salt tolerance and growth-promoting characteristics (in vitro) of four strains of plant growth-promoting rhizobacteria (PGPR) that were pre-selected, as well as their effects on alfalfa at different growth stages (a pot experiment). The results showed that the selected strains belonged to the genera Priestia (HL3), Bacillus (HL6 and HG12), and Paenibacillus (HG24). All four strains exhibited the ability to solubilize phosphate and produce indole-3-acetic acid (IAA) and 1-aminocyclopropane-1-carboxylate (ACC) deaminase. Among them, except for strain HG24, the other strains could tolerate 9% NaCl stress. Treatment with 100 mM NaCl consistently decreased the IAA production levels of the selected strains, but inconsistent changes (either enhanced or reduced) in terms of phosphate solubilization, ACC deaminase, and exopolysaccharides (EPS) production were observed among the strains. During the various growth stages of alfalfa, PGPR exhibited different growth-promoting effects: at the seedling stage, they enhanced salt tolerance through the induction of physiological changes; at the flowering stage, they promoted growth through nutrient acquisition. The current findings suggest that strains HL3, HL6, and HG12 are effective microbial inoculants for alleviating salt stress in alfalfa plants in arid and semi-arid regions. This study not only reveals the potential of indigenous salt-tolerant PGPR in enhancing the salt tolerance of alfalfa but also provides new insights into the mechanisms of action of PGPR.
英文关键词	PGPR saline-alkali soil phosphate solubilization indole-3-acetic acid (IAA) 1-aminocyclopropane-1-carboxylic (ACC) deaminase salt tolerance flowering stage
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:001192509100001
WOS关键词	PHOSPHATE SOLUBILIZATION ; ACC DEAMINASE ; BACTERIA ; SOIL ; DIVERSITY ; DROUGHT ; FUNGI ; ACID
WOS类目	Microbiology
WOS研究方向	Microbiology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404919
推荐引用方式 GB/T 7714	Ma, Xixi,Huang, Cuihua,Zhang, Jun,et al. Comparative Analysis of Plant Growth-Promoting Rhizobacteria's Effects on Alfalfa Growth at the Seedling and Flowering Stages under Salt Stress[J],2024,12(3).
APA	Ma, Xixi.,Huang, Cuihua.,Zhang, Jun.,Pan, Jing.,Guo, Qi.,...&Xue, Xian.(2024).Comparative Analysis of Plant Growth-Promoting Rhizobacteria's Effects on Alfalfa Growth at the Seedling and Flowering Stages under Salt Stress.MICROORGANISMS,12(3).
MLA	Ma, Xixi,et al."Comparative Analysis of Plant Growth-Promoting Rhizobacteria's Effects on Alfalfa Growth at the Seedling and Flowering Stages under Salt Stress".MICROORGANISMS 12.3(2024).