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The study was aimed to develop organic fertilizers replacing chemical fertilizers and reveal the effect mechanism of fertilization on plant health, endophytic bacterial community structures in tomato roots. Five fertilization treatments were set up, no fertilization (CK), application with chemical fertilizer (T1), peanut cake fertilizer (T2), soybean cake fertilizer (T3) and tea cake fertilizer (T4) at the identical nitrogen level. Meanwhile, based on high-throughput sequencing technology, the endophytic bacterial community structure in tomato roots was analyzed. The numbers of endophytic bacterial communities in tomato roots at different taxonomic categories were all improved over CK. Meanwhile, except T4 treatment, the diversity and richness of endophytic bacteria community in tomato roots under T2 and T3 were all higher than those of T1. At the phylum or genus level, the endophytic bacterial composition and the percentage in tomato roots were all altered by different fertilizer treatments. Among them, not only the numbers of dominant endophytic bacterial were improved, but also the endophytic bacterial community structures were reshaped. Particularly, some beneficial bacterial genera, such as Rhizobium, Bacillus, Microbacterium, Castellaniella, with the function of growth promotion, plant resistance and quality improvement enriched in tomato roots under T2 treatment. Compared with CK, the diversity and richness of endophytic bacterial community in tomato roots were improved, and the endophytic bacterial composition in tomato roots could be reshaped by different fertilization. The highest diversity and richness of endophytic bacterial communities could be found in tomato roots under T2 treatment, followed by T3 treatment. The beneficial endophytic bacterial genera, such as Rhizobium, Bacillus, Microbacterium and Castellaniella enriched in tomato roots under T2 treatment only. It indicated that the effect of peanut cake fertilizer on plant health was better than those of chemical fertilizer, soybean and tea cake fertilizers under the identical nitrogen levels.
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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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