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Coupling of the chemical niche and microbiome in the rhizosphere:implications from watermelon grafting

Frontiers of Agricultural Science and Engineering 2016年第3期3卷 249-262页

作者： Yang SONG Chen ZHU Waseem RAZA Dongsheng WANG Qiwei HUANG Shiwei GUO Ning LING Qirong SHEN Jiangsu Provincial Coordinated Research Center for Organic Solid Waste Utilization Nanjing Agricultural University Nanjing Institute of Vegetable Science

Grafting is commonly used to overcome soilborne diseases. However, its effects on the rhizodeposits as well as the linkages between the rhizosphere chemical niche and microbiome remained unknown. In this paper,significant negative correlations between the bacterial alpha diversity and both the disease incidence(r = – 0.832,P = 0.005) and pathogen population(r = – 0.786, P = 0.012)were detected. Moreover, our results showed that the chemical diversity not only predicts bacterial alpha diversity but also can impact on overall microbial community structure(beta diversity) in the ***, some anti-fungal compounds including heptadecane and hexadecane were identified in the rhizosphere of grafted watermelon. We concluded that grafted watermelon can form a distinct rhizosphere chemical niche and thus recruit microbial communities with high diversity. Furthermore, the diverse bacteria and the antifungal compounds in the rhizosphere can potentially serve as biological and chemical barriers, respectively, to hinder pathogen invasion. These results not only lead us toward broadening the view of disease resistance mechanism of grafting, but also provide clues to control the microbial composition by manipulating the rhizosphere chemical niche.

关键词： rhizodeposits rhizosphere microbiome diversity mi seq sequencing watermelon grafting

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