Loss of Lingin and Cellulose Components of Wood of Swietenia Mahagoni and Shorea Robusta due to Decay by Trametes Scabrosa (Pers.) G. H. Cunn, Phellinus Badius (Berk.) G. H. Cunn, and Daedalea Flavida Lév.

Sandhya Santra, Balen Nandi

Abstract


The decay of wood of mahagony (Swietenia mahagoni) and sal (Shorea robusta) caused by Trametes scabrosa, Phellinus badius, and Daedalea flavida was investigated on the basis of quantitative estimation of lignin and cellulose. The lignin and cellulose contents of sound wood of both host species were above 30% and 60%, respectively, of the extractive-free dry weight of wood. Percentage of lignin in decayed wood became much less than that in sound wood, particularly in sapwood, whereas the precentage of cellulose decreased only slightly during the process of decay. Results revealed that the test fungi primarily utilized the lignin portion and only a small amount of cellulose and proved to be "white rot" fungi. From wood of S. mahagoni, maximum amount of lignin was removed by T. scabrosa and cellulose by D. flavida, whereas with S. robusta maximum amount of lignin was utilized by D. flavida and maximum cellulose by P. badius.

Keywords


<i>Swietenia mahagoni</i>;<i>Shorea robusta</i>;white rot;lignin;cellulose;chemical analysis;decay;biodegradation;fungi;<i>Trametes scabrosa</i>;<i>Phellinus badius</i>;<i>Daedalea flavida</i>

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