Assessment of the antifungal activity against plant pathogens of the Streptomyces murinus XKH6 strain isolated from soil growing Curcuma longa in Hung Yen province

Abstract

Streptomyces are evaluated to have strong antagonistic abilities against many species of plant pathogenic fungi. Species of the Streptomyces genus are commonly applied in the creation of biological products used in the control of agricultural diseases. In this article, from 6 actinomycete strains isolated from turmeric-growing soil in Hung Yen province, the XKH6 strain was selected for its simultaneous antifungal activity against five plant pathogenic fungi: Penicillium digitatum, Colletotrichum gloeosporioides, Aspergillus niger, Fusarium oxysporum, and Aspergillus flavus. Notably, the broth cultures of the XKH6 strain 100% effectively controlled the P. digitatum, C. gloeosporioides, and A. niger on artificial infection of orange and apple. Based on morphological characteristics and 16S rRNA sequence, the XKH6 strain was identified as belonging to the species Streptomyces murinus. XKH6 has 100% similarity with S. murinus on GenBank. The S. murinus XKH6 strain has the potential for application in the development of biological products for the control of the P. digitatum, C. gloeosporioides, and A. niger that cause crop diseases.