PJB-2019-475
ANTAGONISTIC ACTIVITIES AGAINST PHYTOPATHOGENIC FUNGI OF A NOVEL NATIVE TRICHODERMA HARZIANUM TH62, AND ITS GROWTH PROMOTION ON CELOSIA CRISTATA
Rui Miao
Abstract
Native Trichoderma Th62 isolated from rhizosphere soil of wild Chelidonium majus was identified via combination of morphological and molecular methods based on rDNA internal transcribed spacer region and elongation factor-1α gene sequences. Resistance of Th62 against five common soil-borne plant pathogens, Sclerotinia sclerotiorum, Fusarium oxysporum, Rhizoctonia solani, Alternaria alternate and Cytospora chrysosperma, was investigated separately. The results showed that Th62 had differential inhibitory effects on the five tested pathogens. The resistance of Th62 against S. sclerotiorum was the most significant, which reached a maximum of 57.41%, followed by Th62’s resistance against C. chrysosperma, A. alternate, R. solani and F. oxysporum, which were 50.83%, 38.33%, 34.03% and 26.92%, respectively. Even the fermentation metabolites of Th62 also had inhibitory effects against the five tested pathogens. Although the resistance of Th62 against each pathogen maintained on different levels with the prolongation of culture time, Th62 is undoubtedly a potential applicable biocontrol agent. Besides, Th62 not only increased the height, stem and biomass, but also has dramatically improved in photosynthetic efficiency of cockscomb (Celosia cristata L). It suggested that Th62 could promote growth of cockscomb by increased photosynthetic capacity and was a biofertilizer agent against to five soil-borne plant pathogens.
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