Diversity, community distribution and growth promotion activities of endophytes associated with halophyte Lycium ruthenicum Murr

3 Biotech - Tập 9 - Trang 1-12 - 2019
Yong-Hong Liu1,2, Yong-Yang Wei1, Osama Abdalla Abdelshafy Mohamad1,3, Nimaichand Salam4, Yong-guang Zhang1, Jian-Wei Guo1,5, Li Li1, Dilfuza Egamberdieva1,6, Wen-Jun Li1,4
1Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, People’s Republic of China
2University of Chinese Academy of Sciences, Beijing, People’s Republic of China
3Department of Biological, Marine Sciences, and Environmental Agriculture, Institute for Post Graduate Environmental Studies, Arish University, Arish, Egypt
4State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-Sen University, Guangzhou, People’s Republic of China
5Key Laboratory of Crops with High Quality and Efficient Cultivation and Security Control, Yunnan Higher Education Institutions, Honghe University, Mengzi, People’s Republic of China
6Department of Biotechnology and Microbiology, Faculty of Biology and Soil Science, National University of Uzbekistan, Tashkent, Uzbekistan

Tóm tắt

The purpose of this study was to investigate the composition, diversity, distribution, and growth promotion activity of endophytic bacteria isolated from L. ruthenicum Murr. Consequently, a total of 109 endophytic bacteria affiliated to 3 phyla, 12 orders and 36 genera were isolated using nine different selective media, from which, Actinobacteria was the dominant taxon containing seven orders at the phylum level; Micrococcales showed the highest diversity containing 12 genera at the family level. Based on PAST and SPSS analysis, species diversity and abundance were mostly isolated from nutritious soil condition (22 genera) and root tissue (27 genera). Furthermore, growth phase showed significant effect on the endophytic bacteria community (28 genera at dormancy and 17 genera at fluorescence stage). With regard to ex situ plant growth-promoting activities, Streptomyces dominated and exhibited broad ability in terms of their potential to grow on nitrogen-free media, synthesize cellulase and lipase enzymes. Characterization of potential plant-beneficial traits indicate that endophytic bacteria exhibited a number of positive activities, including potential diazotrophy (n = 66), phosphate-solubilizing (n = 6), production of lipase (n = 21) and cellulose (n = 35). Two strains, representing Bacillus sp. EGI 63071 and EGI 63106, were found to be effective in promoting the growth of Triticum aestivum (wheat: Xindong No.18) seedling under salt stress conditions.

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