Mining rhizobacteria from indigenous halophytes to enhance alfalfa(Medicago sativa L.)growth and soil reclamation in saline soils of Northwest China

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外文标题：Mining rhizobacteria from indigenous halophytes to enhance alfalfa(Medicago sativa L.)growth and soil reclamation in saline soils of Northwest China

外文摘要：Enhancing the growth of alfalfa(Medicago sativa L.)through inoculation with rhizobacteria represents a sus-tainable strategy for reclaiming saline soils.However,the lack of suitable strains and practical application guidelines poses significant challenges to the utilization of Plant Growth-Promoting Rhizobacteria(PGPR)in salt-affected soils of Northwest China.In this study,we selected four PGPR strains derived from indigenous halo-phytes based on their growth-promoting characteristics.These strains underwent further selection via a petri dish assay.Subsequently,the effects of the selected PGPR strains on alfalfa growth and soil fertility were rigorously examined through pot trials.The results demonstrated that Bacillus filamentosus HL3,B.filamentosus HL6,Bacillus subtilis subsp.stercoris HG12,and Paenibacillus peoriae HG24 significantly produced indole-3-acetic acid(IAA),solubilized phosphorus,and fixed nitrogen(except for B.filamentosus HL6,which did not significantly fix ni-trogen).Compared to non-inoculated plants,B.filamentosus HL6 and B.subtilis subsp.stercoris HG12 significantly enhanced seed germination,root elongation,and seedling biomass in a 150 mmol/L NaCl saline solution.In saline-alkaline soils,PGPR inoculation under brackish water irrigation did not restore alfalfa growth to the levels observed under freshwater irrigation.Principal Component Analysis(PCA)condensed ten indicators into two indices,explaining 86.85％of the variance.Using these two indices as weights,an evaluation model for the PGPR-alfalfa symbiosis indicated that B.subtilis subsp.stercoris HG12 had the most substantial effect under freshwater irrigation,while co-inoculation with B.subtilis subsp.stercoris HG12 and B.filamentosus HL6 had the most significant impact on alfalfa growth and soil improvement under brackish water irrigation.Available phosphorus was identified as the primary factor influencing alfalfa growth,contributing 82.3％to the growth variation.These findings provide suitable microbial strains for the utilization of saline-alkali land and underscore the potential of applying indigenous PGPR-alfalfa symbiotic techniques to improve soil fertility and crop yield in the arid regions of Northwest China.

外文关键词：

Plant Growth-Promoting Rhizobacteria(PGPR)Medicago sativa(alfalfa)Salt stressNitrogen fixationPhosphate solubilization

作者：

XiXi Ma、Jing Pan、Qi Guo、CuiHua Huang、Jun Zhang、Hui Yang、Xian Xue

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作者单位：

Drylands Salinization Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China

University of Chinese Academy of Sciences,Beijing 100049,China

Institute of Biology,Gansu Academy of Sciences,Lanzhou,Gansu 730000,China

关键词：

Plant Growth-Promoting Rhizobacteria(PGPR) Medicago sativa(alfalfa) Salt stress Nitrogen fixation Phosphate solubilization

出版年：

2024

DOI：

10.1016/j.rcar.2024.09.004

寒旱区科学(英文版)

中国科学院寒区旱区环境与工程研究所,科学出版社有限责任公司

寒旱区科学(英文版)

影响因子：0.237

ISSN：1674-3822

年,卷(期)：2024.16(5)