T. harzianum strain (T22) isolates selected for this study were obtained from NRRL (Agricultural Research Service Culture Collection) United States Department of Agriculture (USDA), New Orleans, Louisiana 70179. Cell suspensions of T. harzianum strain 22 were prepared by culturing the fungus in Czapek broth medium at 25°C for 7 days. The resulting culture was filtered through cheesecloth to separate mycelial fragments, washed by centrifugation (10,000 rpm for 15 min).
The Trichoderma was applied to the seeds in two different methods:
(1) In the first one the Trichoderma mycelia was air dried for 72 h and inoculated in loam based garden soil in concentrations of 2, 4 and 6 g of the powdered culture / kg of the soil before sowing time.
(2) In the second method, maize seeds were treated with the metabolic solution (as the culture supernatant of the fungus) in concentrations of 100, 200 and 300 μl for one hour before sowing.
T. harzianum strain (T22) isolates selected for this study were obtained from NRRL (Agricultural Research Service Culture Collection) United States Department of Agriculture (USDA), New Orleans, Louisiana 70179. Cell suspensions of T. harzianum strain 22 were prepared by culturing the fungus in Czapek broth medium at 25°C for 7 days. The resulting culture was filtered through cheesecloth to separate mycelial fragments, washed by centrifugation (10,000 rpm for 15 min).The Trichoderma was applied to the seeds in two different methods:(1) In the first one the Trichoderma mycelia was air dried for 72 h and inoculated in loam based garden soil in concentrations of 2, 4 and 6 g of the powdered culture / kg of the soil before sowing time.(2) In the second method, maize seeds were treated with the metabolic solution (as the culture supernatant of the fungus) in concentrations of 100, 200 and 300 μl for one hour before sowing.
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