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Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (3): 7-15.DOI: 10.7522/j.issn.1000-694X.2021.00001

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Identification of root exudates from continuous cropping potato in dry land and their allelopathy to Fusarium oxysporum

Kuizhong Xie1,2(), Huizhen Qiu1(), Xinyuan Hu2, Aihua Luo2   

  1. 1.College of Resources and Environmental Sciences / Gansu Provincial Key Lab. of Aridland Crop Science,Gansu Agricultural University,Lanzhou 730070,China
    2.Potato Research Institute,Gansu Academy of Agricultral Sicences,Lanzhou 730070,China
  • Received:2020-10-26 Revised:2021-01-04 Online:2021-05-26 Published:2021-05-26
  • Contact: Huizhen Qiu

Abstract:

In order to reveal the relationship between Fusarium wilt and allelochemicals of potato continuous cropping. The root exudates of continuous cropping potato were collected by hydroponics and long-term field experiments. The results showed that 30 kinds of organic acids were detected in 48 compounds secreted by potato roots. Comparing the relative organic acids contents of rotation, 5 years continuous cropping and 10 years continuous cropping, it was found that there was significant difference between malic acid and palmitic acid. The allelopathic effects of malic acid and palmitic acid on Fusarium oxysporum were studied by exogenous addition method. The results showed that malic acid and palmitic acid promoted the growth of F. oxysporum in the concentration range of 0.10-0.50 and 0.05-0.10 mmol·L-1, respectively.The results from the pot experiment showed that malic acid and palmitic acid could significantly promote potato Fusarium wilt in the concentration range of 0.05-0.50 mmol·L-1. The results showed that malic acid and palmitic acid were allelochemicals secreted by potato roots, and the promoting effect of malic acid and palmitic acid on F. oxysporum was the main cause of potato Fusarium wilt.

Key words: potato, root exudates, malic acid, palmitic acid, allelopathy, Fusarium oxysporum, Fusarium wilt

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