盖氏假单胞菌PG-9对苹果根系内生细菌α多样性的影响

盖氏假单胞菌PG-9对苹果根系内生细菌α多样性的影响见表9。施用盖氏假单胞菌PG-9后，其ACE、Chao1、Shannon、Simpson指数分别为115.30±21.01a、110.88±18.42a、1.02±0.42a、0.64±0.16a。其中ACE、Chao1指数分别比对照降低3.14%和6.71%，说明PG-9菌株处理丰富度低于对照。Shannon指数比对照提高30.77%，说明PG-9菌株处理多样性高于对照。均与对照间差异不显著（P>0.05）。结果说明，施用盖氏假单胞菌PG-9在2年内对根系内生细菌α多样性无明显影响。

The effect of Pseudomonas fluorescens strain PG-9 on the alpha diversity of endophytic bacteria in apple roots is shown in Table 9. After application of Pseudomonas fluorescens strain PG-9, the ACE, Chao1, Shannon, and Simpson indices were 115.30±21.01a, 110.88±18.42a, 1.02±0.42a, and 0.64±0.16a, respectively. The ACE and Chao1 indices were reduced by 3.14% and 6.71%, respectively, compared to the control, indicating that the abundance of endophytic bacteria was lower in the PG-9 treatment. The Shannon index was increased by 30.77% compared to the control, indicating that the diversity of endophytic bacteria was higher in the PG-9 treatment. However, these differences were not significant compared to the control (P>0.05). These results suggest that the application of Pseudomonas fluorescens strain PG-9 had no significant effect on the alpha diversity of endophytic bacteria in apple roots within 2 years.