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Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study aims to explore potential new bacterial species and bioactive substances in true mangrove plants, which can enrich the diversity of mangrove microorganisms and provide strain resources for the development of new active products. A total of 22 samples were collected from three true mangrove plants of Kandelia candel, Bruguiera gymnorrhiza, Rhizophora stylosa, and their habitats, in Guangxi coastal area. Then 22 samples were divided according to different parts such as roots, stems, leaves, flowers, fruits and soils. Eight different culture media were used to isolate culturable bacteria, and 16 S rRNA gene sequences were used to identify bacteria and analyze diversity. For cultured bacteria, the antibacterial and enzyme activities of fermented crude extracts were screened with Kirby-Bauer method and spot planting method, respectively. The results were as follows:（1）Based on sequencing results of 16 S rRNA gene, a total of 35 strains of culturable bacteria were isolated, belonging to 28 genera and 23 families. Bacillus accounted for 14.3% of the total bacteria, which was the dominant bacteria. Meanwhile, 11 potential new bacterial species were found.（2）Four strains of bacteria showed antibacterial activities, 16 strains had enzyme activities, and Bacillus was the dominant strain in enzyme activities. The above results show that Guangxi true mangrove plants are rich in bacterial diversity, and some bacteria show antibacterial activities and enzyme activities. The new bacterial species and active strains had certain development potential in the new antibiotics and enzymes application. [ABSTRACT FROM AUTHOR]