Isolation and identification of Streptomyces sp. HBERC-20716 and evaluatingits disease prevention and growth-promoting effects on cotton

doi:10.14088/j.cnki.issn0439-8114.2025.12.017

Abstract

Abstract: A strain of Streptomyces sp. HBERC-20716, which was independently isolated and preserved, was identified, and its efficacy against cotton fusarium wilt as well as its effects on photosynthesis and growth promotion at the cotton seedling stage were evaluated. Through morphological and 16S rRNA gene sequence analyses, the strain was identified as Streptomyces pluricolorescens. Results from indoor pot experiments demonstrated that Streptomyces pluricolorescens HBERC-20716 significantly inhibited the occurrence of cotton fusarium wilt, with a markedly lower seedling blight rate compared to the control. Treatment of cotton seedlings with the fermentation broth of Streptomyces pluricolorescens HBERC-20716 indicated its growth-promoting effect on cotton, as evidenced by plant height, fresh weight, root length, and root weight of the seedlings being significantly greater than those in the control. Measurements of photosynthesis parameters showed that Streptomyces pluricolorescens HBERC-20716 promoted photosynthetic performance, significantly increasing the net photosynthetic rate, transpiration rate, and stomatal conductance, while substantially reducing the intercellular CO₂ concentration.

Key words: Streptomyces pluricolorescens, cotton, photosynthesis, fusarium wilt, growth promotion, biological control

CLC Number:

LONG Tong, WAN Zhong-yi, WANG Xiao-gang, ZHANG You-chang, AI Lun-qiang, FENG Chang-hui. Isolation and identification of Streptomyces sp. HBERC-20716 and evaluatingits disease prevention and growth-promoting effects on cotton[J]. HUBEI AGRICULTURAL SCIENCES, 2025, 64(12): 99-103.

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