Study on enhancement the antagonistic of <i>Trichoderma koningiopsis</i> against <i>Rhizoctonia solani</i> causing sheath blight in rice by gamma irradiation treatment

Diep Bang Tran; Huyen Thanh Tran; Dang Sang Hoang; Xuan An Tran; Phuong Thao Hoang; Xuan Tung Nguyen; Hong Nhung Tran; Xuan Vinh Le

doi:10.15625/2615-9023/20976

Author affiliations

Authors

Tran Bang Diep Hanoi Irradiation Centre, Minh Khai, Tu Liem, Ha Noi, Vietnam
Tran Huyen Thanh Hanoi Irradiation Centre, Minh Khai, Tu Liem, Ha Noi, Vietnam
Hoang Dang Sang Hanoi Irradiation Centre, Minh Khai, Tu Liem, Ha Noi, Vietnam
Tran Xuan An Hanoi Irradiation Centre, Minh Khai, Tu Liem, Ha Noi, Vietnam
Hoang Phuong Thao Hanoi Irradiation Centre, Minh Khai, Tu Liem, Ha Noi, Vietnam
Nguyen Xuan Tung Hanoi Irradiation Centre, Minh Khai, Tu Liem, Ha Noi, Vietnam
Tran Hong Nhung Hanoi Irradiation Centre, Minh Khai, Tu Liem, Ha Noi, Vietnam
Le Xuan Vinh Hanoi Irradiation Centre, Minh Khai, Tu Liem, Ha Noi, Vietnam

DOI:

https://doi.org/10.15625/2615-9023/20976

Keywords:

Antagonistic, gamma irradiation, mutant, Rhizoctonia solani, Trichoderma koningiopsis.

Abstract

As targeted mutagenesis techniques become more prevalent for various filamentous fungi, the use of physical mutagen to induce random genetic variations across whole-genome remains an ideal option for genetic improvement. The aim of this study was to investigate the use of gamma radiation to enhance the antagonistic ability of Trichoderma against plant pathogenic fungi. The spore suspensions of Trichoderma koningiopsis VTCC 31435 was irradiated at doses ranging from 0 to 2500 Gy using a gamma Co-60 source at the Hanoi Irradiation Center. The results showed that the number of surviving spores depends on the irradiation dose. Spore numbers decreased sharply in the dose range of 100 to 1200 Gy, at higher doses, the variation in spore numbers was less pronounced. The required radiation dose to kill 90% of the total number of fungal spores (D10) of the T. koningiopsis VTCC 31435 strain was approximately 250 Gy. At a dose of 2500 Gy, the number of fungal but surviving spores decreased by about 7 Log units compared to the non-irradiated. After irradiation, morphological changes, as well as growth characteristics, were observed in some of the radiation-resistant obtained colonies. Using cellophane membrane assay and dual culture methods, five potential radiation-resistant mutants with better antagonistic ability against the fungus Rhizoctonia solani, which causes sheath blight in rice, were identified Notably, among these, the potential mutant VTCC(a) I-1 exhibited the highest antifungal activity of media-permeable metabolites (I_CMA) and mycelial growth inhibition activity (I_MG) against R. solani. The I_CMA and I_MG values of this mutant increased by 154.12% and 148.68%, respectively, compared to the wild-type strain and remained stable for at least six consecutive generations. The research results suggest that gamma irradiation may have potential applications in enhancing the antagonistic abilities against pathogenic fungi and other beneficial biological properties in Trichoderma sp.

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