Identification of interior salt-tolerant bacteria from ice plant Mesembryanthemum crystallinum and evaluation of their promoting effects

文献类型： 外文期刊

第一作者： Zhang, Jian

作者： Zhang, Jian;Wang, Pengcheng;Tian, Hongmei;Jiang, Haikun;Wang, Yan;Yan, Congsheng;Zhang, Jian;Wang, Pengcheng;Tian, Hongmei;Jiang, Haikun;Wang, Yan;Yan, Congsheng;Jiang, Haikun

作者机构：

关键词： Salt-tolerance; Nitrogen-fixing bacteria; Ice plant; Vegetable crop; Saline condition

期刊名称：SYMBIOSIS （ 影响因子：2.268； 五年影响因子：2.471 ）

ISSN： 0334-5114

年卷期： 2018 年 76 卷 3 期

页码：

收录情况： SCI

摘要： Endophytic bacteria can stimulate host plant development. Insufficient information is available about NaCl-tolerant bacteria that colonize ice plants (Mesembryanthemum crystallinum) in their habitats. In this study, a culture-dependent method was used to isolate endophytic nitrogen-fixing bacteria from ice plants, and the resulting cultures were screened for salt-stress tolerance in vitro. A total of 17 salt-tolerant bacteria were obtained. The majority of the isolates grew well in 2.05 M NaCl with a maximum tolerance at 3.59 M. Most of the strains were Gram-positive bacteria with various plant growth-promoting traits. The 16 S rRNA gene sequences revealed that the 17 isolates were distributed within three genera and corresponded to the bacterial species Halomonas sp., Bacillus sp., and Planococcus sp. Inoculation of cabbage (Brassica olereacea) seeds with selected strains showed that the strain MC1 promoted seed germination, and the same strain significantly increased root dry weight under saline stress by 24.5%. Our study suggests that ice plants naturally accommodate a variety of salt-tolerant endophytic bacteria and that these bacteria are able to relieve abiotic stress during plant growth.

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