1Vegetable Institute of Zhejiang Academy of Agricultural Sciences，Hangzhou 310021, Zhejiang, China; 2Horticulture Department of Zhejiang University, Hangzhou 310029, Zhejiang, China
Abstract：The changes of microorganisms population, bacterial community structure and 2, 4-DAPG producers community structure in rhizosphere soil of grafted watermelon〔Citrullus lanatus（Thunb.）Matsum. et Nakai〕plants were studied using the methods of microorganism culture, 16S rDNA PCR-RFLP and phl D gene PCR-RFLP, respectively. The results showed that the bacterial and fungal population in rhizosphere soil of grafted watermelon was increased and that of the actinomyces population was decreased; the grafted watermelon had one similar main 16S rDNA genotype in rhizosphere soil with the non-grafted watermelon, although the grafted watermelon with different stock had their unique 16S rDNA genotypes different from non-grafted watermelon; the grafted watermelon had different main 2, 4-DAPG producers phl D genotypes from non-grafted watermelon.
