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Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (11): 2171-2184.doi: 10.16420/j.issn.0513-353x.2020-0760

• Original article • Previous Articles     Next Articles

Screening and Culture Characteristics of Biocontrol Strains of Postharvest Anthracnose of Mango

ZHANG Xiaoyong, LI Shujiang, YAN Kai, WENG Guiying, ZHANG Yunxia, LONG Qiaofang, LIANG Wen, JIANG Qinna, YANG Youlian()   

  1. School of Biological Sciences and Technology,Liupanshui Normal University,Liupanshui,Guizhou 553004,China
  • Received:2021-04-22 Revised:2021-08-27 Published:2021-12-02
  • Contact: YANG Youlian E-mail:yangyoulianl@163.com

Abstract:

Bacillus strains were isolated from Gentiana rhodantha stems with highly antifungal activity resist mango anthracnose was screened by confrontation culture with Colletotrachum gloeosporioides. The fungistatic effect of mycelial growth and conidia germination was measured by in vivo experiment. The control efficiency of antagonistic strain against anthracnose was tested by surface coating method using wounded mango fruit. The structure of the antifungal substances in fermentation broth of antagonistic bacteria was detected by high performance liquid chromatography-mass spectrometry(HPLC-MS),and single factor experiment was used to study on the optimal growth and fermentation conditions,respectively. Based on morphological,physiological and 16S rDNA and gyrB sequences analysis,the strain SB023 which significant antifungal activity against mango anthracnose was identified as Bacillus velezensis. The mycelial growth and spore germination of pathogen were significantly inhibited by the fermentation broth of strain SB023. The control effect of SB023 to against anthracnose of mango reached 100% then coated with 0.1% Tween-80,2% sodium alginate and 10% fermentation broth. The main antifungal substances were Surfactin C,Bacillomycin D,Bacillomycin L and Iturin A in broth. The fermentation study showed that the optimal culture medium for KMB with yeast extract,maltose,magnesium sulfate,initial pH 7.0 and incubated at 28-30 ℃.

Key words: mango, anthracnose, Bacillus velezensis, antagonistic bacteria, antifungal substance, fermentative conditions

CLC Number: