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The 16S rRNA high-throughput sequencing analysis was conducted on the rhizosphere soil of Cassava South China No.12 under treatment without fertilization (CK), organic fertilizer (T1), conventional fertilization applied with organic fertilizer (T2), and reduced chemical fertilizer applied with organic fertilizer (T3) by using the Illumina Nova 6000 sequencing platform to study the effects of chemical fertilizer application combined with organic fertilizer on the growth of cassava and the bacterial diversity and community structure in cassava rhizospheric soil. T3 not only significantly increased the height and stem thickness of cassava, but also improved the yield of cassava, compared to CK. Cluster analysis was performed on the sequences based on 97% similarity, the OTUs numbers of CK, T1, T2 and T3 are 3603, 1688, 1276 and 3317 respectively. Different fertilization methods altered the diversity and richness of soil bacteria, with the species diversity ranked from highest to lowest as CK>T3>T1>T2. Based on PCoA and cluster analysis, the community composition of CK and T3 was similar, the community composition of T1 and T2 was similar. The dominant phylum in cassava rhizospheric soil under different fertilization treatments were Proteobacteria, Bacteroidetes, Acidobacteria, Firmicutes, Actinobacteria and Chloroflexi. The relative abundance of Proteobacteria, Bacteroidetes and Actinobacteria increased under T3 treatment, while the relative abundance of Firmicutes and Chloroflexi decreased. Redundancy analysis results indicated that available potassium was the main factor affecting the bacterial community in the cassava rhizosphere soil. In summary, the study demonstrates that reduced chemical fertilizer application combined with organic fertilizer not only increases the yield of cassava, but also changes the community structure and diversity of the bacterial in the rhizosphere soil. The results would provide a solid theoretical foundation for the development of a green, efficient, and sustainable cassava industry.
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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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