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The structural characteristics of the rhizosphere bacterial communities of cucumber plants under different proportions of mushroom residue and sawdust were analyzed, and it was found that mushroom residue and sawdust compound substrate could replace conventional commercial matrix peat (CK) cultivation cucumber, which providing a basis for the application of a new substrate cultivation mode. Compared with CK, cucumber cultivated with substrate composed of mushroom residue and sawdust in three different proportions significantly increased its yield, rhizosphere bacterial diversity and richness index, and also affected the metabolic function of rhizosphere bacteria, among which the ratio of mushroom residue to sawdust was 1∶1 (T2). At the classification level, the proportion of bacterial abundance in Proteobacteria of cucumber plants under the cultivation of mushroom residue and sawdust compound substrate was lower than that of CK, but the proportion of bacterial abundance of Bacteroidota was higher than that of CK, and Bacteroidota was the dominant bacterial phylum shared by mushroom residue and sawdust compound substrate cultivation. At the taxonomic level, unclassified_c__Gammaproteobacteria, Limnobacter and Chujaibacter were the dominant bacterial genera unique to the root system of cucumber plants under CK conditions. Bradyrhizobium, Brevundimonas, and Dokdonella were the dominant bacterial genera with a 1∶3 (T1) ratio of mushroom residue to sawdust. Under the conditions of 1∶1 (T2) and 3∶1 (T3) ratios of mushroom residue to sawdust, respectively, no dominant bacterial genus was found in the rhizosphere of cucumber plants. Through species Venn analysis, the ratio of mushroom residue to sawdust at the species classification level increased the number of rhizobacteria species in cucumber plants under the treatment of 1∶3 (T1), 1∶1 (T2) and 3∶1 (T3), and the richness and diversity of rhizosphere bacteria were improved.
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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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