Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2021, Vol. 42 ›› Issue (4): 1099-1105.DOI: 10.3969/j.issn.1000-2561.2021.04.028

• Plant Protection & Bio-safety • Previous Articles     Next Articles

Identification and Biological Characteristics of the Pathogen Causing Postharvest Decay of Cowpea

HONG Xiaoyu1, LI Min1, GONG Deqiang1, GAO Zhaoyin1, YANG Yan2, WANG Yi3, HU Meijiao1,*()   

  1. 1. Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences / Key Laboratory of Integrated Pest Management on Tropical Crops, Ministry of Agriculture and Rural Affairs, Haikou, Hainan 571101, China
    2. Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
    3. School of Life and Pharmaceutical Sciences, Hainan University, Haikou, Hainan 570228, China.
  • Received:2020-05-05 Revised:2020-06-04 Online:2021-04-25 Published:2021-04-25
  • Contact: HU Meijiao

Abstract:

Cowpea is one of the most important winter vegetables in Hainan. The postharvest decay was occasionally found during storage of cowpea in 2019. The pathogen was confirmed to be Pythium aphanidermatum (Edson) Fitzp. based on cultural features, pathogenicity, morphological characteristics and molecular identification. In this study, the biological characteristics of P. aphanidermatum were preliminarily studied by the mycelium growth rate method. The results showed that the suitable temperature was 30 ℃ to 35 ℃, and the optimum temperature was 35 ℃. The lethal temperature was 50 ℃ for 10 min. The suitable pH value was 7.0 to 9.0, and the optimum pH value was 9.0. The optimal carbon source and nitrogen source were starch and peptone, respectively. Different light had no effect on the colony growth. To our knowledge, this is the first report of P. aphanidermatum caused postharvest decay of cowpea in China.

Key words: cowpea, Pythium aphanidermatum, identify, storage, biological characteristics

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