EFFECT OF EUCALYPTUS CITRIODORA HOOK. LEAF LITTER EXTRACT ON THE LITTER-.DECOMPOSING ABILITY OF CERTAIN AILICROFUNGIA. TEJASVI AND M.U. CHARAYA
Trichoderma lignorum was the best decomposer of wheat straw in vitro followed by Aspergillus niger, Aspergillus terreus and Aspergillus flavus. Eucalyptus leaf extract had a positive effect on in vitro decomposition of wheat straw by A. terreus and A .flavus, while, it inhibited the in vitro decomposition of wheat straw by A. niger and T. lignorum. Strong inhibition of carboxymethylcellulase activity and polygalacturonase activity of T. lignorum by eucalyptus leaf extract might be responsible for strong inhibition of decomposition by T. lignorum. In case of A. niger, stimulation of CMCase activity largely affects the inhibitory effect on PG activity. Stimulation of both CMCase and PG activity in A. terreus might be responsible for increase in the rate of decomposition by the fungus in the presence of eucalyptus leaf extract. In case of A. flavus, CMCase activity was stimulated substantially and therefore, in spite of inhibition of its PG activity, the net rate of decomposition was increased. The differential effect of eucalyptus leaf litter extract on enzyme activities of the soil fungi might be a factor contributing to differential effects on rate of litter decomposition by these fungi.and more accurate.
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