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6/9/2011 8:08:53 PM
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Effect of environmental condition on antagonism between Trichoderma harzianum Rifai andRhizoctonia solani Kuhn
AbstractA series of laboratory experiments were conducted to study the effect of environmental parameters (temp. and pH) on the antagonism process between bio-control agent, Trichoderma harzianum Rifai and fungal pathogen, Rhizoctonia solani Kuhn. In particular on growth and antagonist activity of both fungi at different levels of temp. (15,25, 35 0C) and pH (4,6,8) along 7 days. The results revealed increasing the growth of R. solani at 25 and 35 0C, and reduced at 150Cthrough all levels of pH. In contrast, the growth of T. harzianum was increased significantly at 25 0C, compared with that at 15 and 350Cwhen using 6 and 8 pH.Successive development of T. harzianum varied with different levels of Temp. and pH and that could reflected its antagonist activity, as more inhibition to the growth of fungal pathogen was obtained at pH 4 for all ranges of temp. used in this experiment in comparison with that at pH 6.Microscopic photographs for antagonism process showed the twisting of T. harzianum mycelium around the mycelium of R. solani were coincided with collapsing and malformation of R. solani cell walls which possibly resulted from enzymatic secretion by bio-agent fungal eg. Chitinase and protease.A series of laboratory experiments were conducted to study the effect of environmental parameters (temp. and pH) on the antagonism process between bio-control agent, Trichoderma harzianum Rifai and fungal pathogen, Rhizoctonia solani Kuhn. In particular on growth and antagonist activity of both fungi at different levels of temp. (15,25, 35 0C ) and pH (4,6,8) along 7 days. The results revealed increasing the growth of R. solani at 25 and 35 0C, and reduced at 15 0C through all levels of pH. In contrast, the growth of T. harzianum was increased significantly at 25 0C, compared with that at 15 and 350C when using 6 and 8 pH.Successive development of T. harzianum varied with different levels of Temp. and pH and that could reflected its antagonist activity, as more inhibition to the growth of fungal pathogen was obtained at pH 4 for all ranges of temp. used in this experiment in comparison with that at pH 6.Microscopic photographs for antagonism process showed the twisting of T. harzianum mycelium around the mycelium of R. solani were coincided with collapsing and malformation of R. solani cell walls which possibly resulted from enzymatic secretion by bio-agent fungal eg. Chitinase and proteaseA series of laboratory experiments were conducted to study the effect of environmental parameters (temp. and pH) on the antagonism process between bio-control agent, Trichoderma harzianum Rifai and fungal pathogen, Rhizoctonia solani Kuhn. In particular on growth and antagonist activity of both fungi at different levels of temp. (15,25, 35 0C ) and pH (4,6,8) along 7 days. The results revealed increasing the growth of R. solani at 25 and 35 0C, and reduced at 15 0C through all levels of pH. In contrast, the growth of T. harzianum was increased significantly at 25 0C, compared with that at 15 and 350C when using 6 and 8 pH.Successive development of T. harzianum varied with different levels of Temp. and pH and that could reflected its antagonist activity, as more inhibition to the growth of fungal pathogen was obtained at pH 4 for all ranges of temp. used in this experiment in comparison with that at pH 6.Microscopic photographs for antagonism process showed the twisting of T. harzianum mycelium around the mycelium of R. solani were coincided with collapsing and malformation of R. solani cell walls which possibly resulted from enzymatic secretion by bio-agent fungal eg. Chitinase and protease.
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- Effect of environmental condition on antagonism between Trichoderma harzianum Rifai and Rhizoctonia solani Kuhn
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