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Objective To elucidate the diversity and community composition of endophytic and rhizospheric bacteria associated with Apocynum venetum in northern Xinjiang and to screen the strains with efficient and specific degumming potential. Methods Samples of A. venetum were collected from four regions: Karamay, Fukang, Urumqi, and Turpan. The bacterial community structure was analyzed by 16S rRNA gene high-throughput sequencing. Pure-culture techniques were employed for strain isolation, and functional strains exhibiting xylanase and pectinase activities but lacking cellulase activity were screened by Congo red staining and enzyme activity assays. Results High-throughput sequencing identified 872 genera of bacteria belonging to 345 families of 38 phyla, among which Pseudomonadota and Actinomycetota were the dominant phyla. Bacterial abundance and diversity followed the order: rhizospheric soil>root>leaf>stem. Microbial abundance and diversity at the Turpan site were lower than those at the other sampling sites. A total of 361 bacterial strains were isolated in pure culture, belonging to 86 genera, 47 families of 4 phyla. Nine specific degumming strains were screened out, of which seven (77.78%) strains were endophytes derived from stems and leaves. The optimal functional strain, Bacillus rugosus (VFS.M1.04), showed xylanase and pectinase activities of 2 237 U/mL and 1 002 U/mL, respectively. Conclusion The community structures of endophytic and rhizospheric bacteria associated with A. venetum are significantly influenced by habitats and plant parts. Bacillus is the dominant functional genus, and the homologous screening strategy effectively enables the acquisition of elite strains with strong degumming capacity and no cellulose degradation from stem and leaf endophytes. This study provides valuable microbial resources and a theoretical basis for developing a green biological degumming process for A. venetum. These findings support the targeted exploitation of plant-associated microbial strains for sustainable fiber processing.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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