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Diversity and probiotic activities of endophytic bacteria associated with the coastal halophyte Messerschmidia sibirica

文献类型： 外文期刊

作者： Zhang, Chengwei 1 ; Tian, XueYing 2 ; Zhang, Cheng-Sheng 2 ;

作者机构： 1.Changahou Coll Informat Technol, Changahou 213164, Peoples R China

2.Chinese Acad Agr Sci, Marine Agr Res Ctr, Tobacco Res Inst, Qingdao 266101, Shandong, Peoples R China

3.Chinese Acad Agr Sci, Qingdao Res Ctr Special Crops, Qingdao 266101, Shandong, Peoples R China

关键词： Endophyte; Bacteria; 16S rRNA gene; Plant growth promotion; Anti-phytopathogen activity; Coastal saline soil

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.046； 五年影响因子：4.884 ）

ISSN： 0929-1393

年卷期： 2019 年 143 卷

页码：

收录情况： SCI

摘要： There is an increasing interest for exploitation and utilization of endophyte resources. However, little was known about endophytic bacteria (EB) associations with halophytes. It is hypothesized that EB from halophytes have evolved mechanisms that promote plant growth, while improving host-plant resistance to biotic and abiotic stress. The present study is the first to examine culturable EB colonization in Messerschmidia sibirica, a salt-secreting halophyte grown in coastal zone of Shandong peninsula in China. Total 198 EB strains were isolated from 450 samples of healthy M. sibirica leaf, stem, and root tissues. Phylogenetic analysis of 16S rRNA gene identified 40 EB genera, indicating a high degree of diversity. Pseudomonas alcaliphila had the highest colonization frequency in leaves and roots, whereas Bacillus subtilis was highest in stems. Diversity and species richness were greater in leaves and stems than in roots. Notably, cultivation-independent and -dependent analyses identified different bacterial species, especially when abundance is low, indicating the necessity of combining the two methods. Most (92.39%) strains exhibited at least one plant growth promotion trait. Respectively, 68.69%, 75.25%, 47.98%, 21.21%, and 48.48% of strains exhibited 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity, IAA secretion, siderophore production, and N-fixation, and P-solubilization. In addition, 13.64% of strains showed antimicrobial activity against one or more plant pathogens, including Phytophthora nicotianae, Alternaria alternata, Ralstonia solanacearum, Acidovorax citrulli, Pseudomonas syringae pv. lachrymans, and Erwinia carotovora subsp. Carotovora. Overall, our results supported the habitat-adapted symbiosis hypothesis, demonstrating that M. sibirica naturally harbors a diverse array of EB with different traits beneficial to the host plant.

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