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Allelopathic effects of root exudates from watermelon and rice plants on Fusarium oxysporum f.sp. niveum

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Abstract

Root exudates have a key role in communication between plants and microbes in the rhizosphere. Fusarium wilt of watermelon, caused by Fusarium oxysporum f. sp. niveum (Fusarium oxysporum), drastically reduces watermelon yields in continuous cultivation systems, but it can be significantly alleviated using watermelon/aerobic rice intercropping system as shown by the research carried out in this laboratory. It is important to evaluate the interaction between root exudates from the two crops and the pathogen and thus to clarify the mechanism of disease suppressiveness in the intercropping system. The effects of phenolic acids, sugars and free amino acids in root exudates from watermelon (REW) and rice (RER) on the growth of Fusarium oxysporum were studied. The results obtained are listed as follows: (1) REW significantly increased spore germination and sporulation, whereas RER had inhibitory effects on those two parameters. (2) HPLC analysis showed that salicylic acid, p-hydroxybenzoic acid and phthalic acid were identified in exudates from both plants, but p-coumaric acid was only detected in rice and ferulic acid only in watermelon. Moreover, of the total rice exudates a high proportion (37.9 %) of p-coumaric acid was detected and the total amount of phenolic acids was 1.4-fold as high as that in watermelon. (3) Considerable differences in the components and contents of both sugars and amino acids were found between REW and RER exudates. (4) Exogenously applied alanine (Ala) increased spore germination and sporulation. In contrast, addition of exogenous p-coumaric acid reduced spore germination and sporulation, relative to controls. It was concluded that the rice root exudates had anti-fungal properties while that from watermelon promoted pathogen growth. This discovery provided a scientific basis for practicing watermelon/aerobic rice intercropping to control Fusarium wilt in watermelon.

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Acknowledgement

We gratefully acknowledge National Nature Science Foundation of China (30871599, 40871126) for its funding of this project and we also thank Dr Tony Miller at Rothamsted Research, UK for his careful revision of this manuscript.

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  1. Jiangsu Key Laboratory for State Organic Waste Utilization, Nanjing Agricultural University, Nanjing, China, 210095

    Wen-ya Hao, Li-xuan Ren, Wei Ran & Qi-rong Shen

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  1. Wen-ya Hao
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  4. Qi-rong Shen
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Correspondence to Qi-rong Shen.

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Responsible Editor: Harsh P. Bais.

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Hao, Wy., Ren, Lx., Ran, W. et al. Allelopathic effects of root exudates from watermelon and rice plants on Fusarium oxysporum f.sp. niveum . Plant Soil 336, 485–497 (2010). https://doi.org/10.1007/s11104-010-0505-0

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