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Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (4): 893-906.doi: 10.16420/j.issn.0513-353x.2021-0051

• Research Notes • Previous Articles     Next Articles

Identification of the Pathogens Causing Root Rot on Allium tuberosum and Study on Their Biological Characteristics

GAO Xiaomei1,*(), LÜ Guozhong2, LI Yang1, AO Jing1, LIU Xiaohui1, SUN Yulu1   

  1. 1. Microbial Research Institute of Liaoning Province,Chaoyang,Liaoning 122000,China
    2. Dalian Minzu University,Dalian,Liaoning 116600,China
  • Received:2021-06-15 Revised:2021-11-16 Online:2022-04-25 Published:2022-04-25
  • Contact: GAO Xiaomei E-mail:gaoxiaomei8115@163.com

Abstract:

Chinese chive(Allium tuberosum)root rot is one of the main diseases of continuous cropping chive in greenhouse. In order to explore the main pathogens of chive root rot disease in Liaoning Province,45 isolates of the genus Fusarium were generated from diseased chive roots and finally identified as F. oxysporum,F. proliferatum and F. solani based on their morphological characteristics and EF-1a,Histone3,rDNA-IGS sequences analysis. These three Fusarium species were confirmed to be the pathogenic agents of the disease according to Koch’s rule. Studies on the biological characteristics of the three pathogens showed that the most suitable growth temperature is about 30 ℃;the optimal growth pH value are at pH 7-8;full dark is conducive to the mycelial growth of the three species;their mycelia can be killed at 75 ℃ for 10 min;their conidia can not germinate at 56 ℃ for 10 min. These pathogens have the highest utilization rate of rhamnose as carbon source and sodium nitrate and glycine as nitrogen source. In summary,F. oxysporum,F. proliferatum and F. solani are the principal pathogenic fungi causing root rot of A. tuberosum,of which F. oxysporum is the most dominant pathogenic species because of its wide distribution and stronger pathogenicity.

Key words: Chinese chive, root rot, Fusarium, identification, biological characteristics

CLC Number: