ADAPTABILITY OF UV IRRADIATED MUTANT OF TRICHODERMA HARZIANUM TO CARBENDAZIM

Abstract

Trichoderma harzianum, a potential bioagent used against different seed and soil borne plant pathogens is highly
susceptible to the most widely used fungicide carbendazim. UV irradiated mutants of T. harzianum was developed
by exposing T. harzianum to 30 W UV-irradiation for 10, 20, 30, and 40 min at 20 cm distance. Different
concentrations of carbendazim (10, 20, 30, 50, 100 ìg/ml) were tested for sensitivity against wild and mutants of
T. harzianum (Th-W, Th-M-1, Th-M-2, Th-M-3, Th-M-4). Mutant of T. harzianum Th-M-2 and Th-M-3 showed
minimum growth inhibition at 10 ìg/ml concentration of carbendazim. Mutants T. harzianum (M-1, M-2, M-3,
M-4) showed better inhibition as compared to wild T. harzianum (Th-W) at any concentration of the fungicide
carbendazim.