Lignin is the second most abundant renewable aromatic polymer on earth.Its biodegradation is the rate-determining step in the carbon cycle.White rot fungi are the only known organisms that can completely break down the lignin to carbon dioxide and water.The ligninolytic system of Phanerochaete chrysosporium,a white rot fungus,has been widely studied as a model strain.White rot fungi was studied for the degradation of lignin at first.The degradation of lignin by white rot fungi mainly depended on the l...