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[Objective] To investigate the effects of hydrogen sulfide (H2S) on the structures of phyllosphere and rhizosphere microbial communities of soybean plants under drought stress. [Methods] High-throughput sequencing of the 16S rRNA gene was combined with bioinformatics analyses (α and β diversity, species composition, co-occurrence networks analysis, etc.) to study the phyllosphere and rhizosphere microbial communities of soybean plants before and after NaHS treatment. [Results] For the soybean plants under normal moisture conditions, the addition of NaHS decreased the diversity and increased the endemic species of phyllosphere microbial community. The addition of NaHS increased the diversity of rhizosphere microbial community of soybean plants under normal moisture conditions but not under severe drought. In addition, exogenous addition of NaHS altered the bacterial co-occurrence network, and the microbial communities in both phyllosphere and rhizosphere were so aggregated that neither rhizobium inoculation nor NaHS addition had significant influences on them. The addition of NaHS mildly affected the relative abundance of operational taxonomic unit (OTU) in the phyllosphere and decreased the relative abundance of OTU in the rhizosphere, which was particularly pronounced under severe drought. Rhizobium inoculation and NaHS addition enriched different microbial taxa in both phyllosphere and rhizosphere. [Conclusion] Under drought stress, H2S had an insignificant modulating effect on the microbial community structure in the phyllosphere but a pronounced effect on the microbial community structure in the rhizosphere of soybean plants. H2S reduced the relative abundance of total OTU in the rhizosphere and altered the bacterial co-occurrence network, thus influencing soybean adaptation to drought stress.
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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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