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Biodiversity and plant growth promoting traits of culturable endophytic actinobacteria associated with Jatropha curcas L. growing in Panxi dry-hot valley soil

文献类型： 外文期刊

作者： Qin, Sheng 1 ; Miao, Qian 1 ; Feng, Wei-Wei 1 ; Wang, Yu 1 ; Zhu, Xiao 1 ; Xing, Ke 3 ; Jiang, Ji-Hong 1 ;

作者机构： 1.Jiangsu Normal Univ, Key Lab Biotechnol Med Plant Jiangsu Prov, Xuzhou 221116, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing 210014, Jiangsu, Peoples R China

3.Jiangsu Normal Univ, Sch Life Sci, Xuzhou 221116, Jiangsu, Peoples R China

关键词： Endophytic actinobacteria;Diversity;ACC deaminase;Plant growth-promoting;Jatropha curcas L.

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

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收录情况： SCI

摘要： One of the proposed mechanisms through which plant growth-promoting endophyte (PGPE) enhances plant growth is the production of 1-aminocyclopropane-1-carboxylic acid deaminase (ACCD). However, information about the endophytic actinobacteria with ACC deaminase activity associated with native plants is still very scarce. In this study, a total of 257 endophytic actinobacterial isolates were obtained using actinobacteria-selective media from surface sterilized roots, stems, leaves and seeds of the oil-seed plant Jatropha curcas L. collected from dry-hot valley soil. Morphological and the 16S rRNA sequence analysis showed that most of the isolates belong to the Streptomyces genus and other non-Streptomyces strains distributed onto 13 genera, with several new species. 19 strains were found to have ACC deaminase activity and they belong to the genera Streptomyces, Nonomuraea, Micrococcus and Kibdelosporangium. The functional ability of the ACC deaminase producing isolates to produce indole-3-acetic acid (IAA), siderophores, mineral phosphate solubilization and growth on nitrogen free semisolid medium was also determined. Seven strains were selected to inoculate the axenically grown seedlings and they resulted in a significant increase in the seedling fresh weight, the seedling length, the root length and the leaf area of the endophytes-treated seedlings compared to the control. This is the first report on the diversity and characterization of endophytic actinobacteria associated with important oilseed plant J. curcas L. Our results demonstrate that some endophytic actinobacterial strains have the promising PGP attributes to be developed as biofertilizers to enhance soil fertility and promote the plant growth. (C) 2015 Elsevier B.V. All rights reserved.

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