DNA extraction and PCR conditions
For DNA preparation, a mycelium plug of each strain was placed on a cellophane disk sterilized by autoclaving in water and placed on the surface
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Biocontrol of rice sheath blight with Trichoderma
of yeast extract agar (5 g yeast extract, 5 g dextrose and 20 g agar L-1) for 2–3 days at room temperature. The fresh mycelium was scraped off and ground with a mortar and pestle in liquid nitrogen. Total DNA was extracted using the GenElute Plant Genomic DNA Miniprep Kit (Sigma-Aldrich, St. Louis, USA) according to manufacturer’s instructions.