Effect of Oxygen on Upgradation of Wheat Straw withPleurotus sajor cajuat High Partial Pressure of Carbondioxide

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Abstract
Zadrazil, F. and Puniya, A.K. 1993. Effector oxygen on upgradation of wheat straw with Pleurotus sajor caju at high partial pressure of carbondioxide. J. Appl. Anim. Res., 4: 73–82. The aim of this experiment was to study the efficiency of fungal upgrading of wheat straw with Pleurotus sajor caju. The hypothesis, that fungal mineralization can be lowered and efficiency of enzymatic degradation increased, was tested. The influence of different gas concentrations (carbondioxide, 50%; oxygen, 0–50%; nitrogen, 50-0%; v/v) on primordia formation and degradation pattern of wheat straw by P. sajor caju were studied. The cultures were gassed in three different ways i.e. A: for 20 days, B: for 40 days and C: incubated by passive air exchange for first 20 days and exposed to gas mixtures for the next 20 days. Lignin degradation increased in all variants with increasing oxygen concentrations. The highest loss of lignin (39.7%) was in cultures grown with passive air exchange through cotton stopper. The in vitro digestibility increased with increasing oxygen (0–40%) concentration. The highest increase in digestibility (23.20%) was in group C at 40% oxygen, over untreated sterile straw (28.47% = O). The efficiency of lignin degradation (Loss of lignin: Loss of organic matter) and changes in digestibility (IVD: LOM) of wheat straw were markedly increased in all variants depending on oxygen and other treatment parameters.