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Chinese Journal of Biological Control ›› 2022, Vol. 38 ›› Issue (3): 555-564.DOI: 10.16409/j.cnki.2095-039x.2021.05.022

• RESEARCH REPORTS • Previous Articles    

Influence of Plant Growth Regulators on Sporulation and Conidia Characteristics of the Entomopathogenic Fungus Beauveria bassiana

CAO Weiping1, ZHEN Wei2, CHEN Dan1, FENG Shuo1, SONG Jian1   

  1. 1. Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences/IPM Center of Hebei Province/Key Laboratory of Integrated Pest Management on Crops in Northern Region of North China, Ministry of Agriculture, Baoding 071000, China;
    2. Hebei Xiaowutai Mountain National Nature Reserve, Zhangjiakou 075700, China
  • Received:2021-05-12 Published:2022-06-20

Abstract: Entomopathogenic fungus Beauveria bassiana plays an important role in biological control of agricultural and forest pests. Fermentation period and sporulation quantity were regarded as the main evaluation indexes of B. bassiana fermentation. Influence of plant growth regulators on the conidial production of B. bassiana strain JG-17 was investigated. The results showed that the conidial production was significantly increased by spraying ethephon solution on the fungal colony at the vegetative growth stage. The sporulation in the fungal colony treated with 100 ng/cm2 of ethephon on the 8th day of cultivation was 6.28 times of that in the control. No significant differences were observed in heat resistance, UV resistance and virulence against target pests of the conidia between the ethephon treatment and the control. A reasonable application of ethephon to the culture of B. bassiana can effectively improve the sporulation efficiency of B. bassiana. The results provide a new idea to improve mass production efficiency of fungal pesticides

Key words: Beauveria bassiana, plant growth regulators, ethephon, conidial production, stress tolerance

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