Chemical and biochemical changes in the rice straw substrate related to the morphogenesis, cropping patternand yield of Pleurotus florida (Block & Tsao.)

Shashirekha, M. N. and Rajarathnam, S. and Zakia, Bano (2001) Chemical and biochemical changes in the rice straw substrate related to the morphogenesis, cropping patternand yield of Pleurotus florida (Block & Tsao.). Journal of Horticultural Science & Biotechnology, 76 (3). pp. 332-337.

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Abstract

Growth and yield of Pleurotus ¯orida on rice straw were studied as a function of temperature. At an ambient temperature of 208C, a maximum bioconversion ef®ciency (yield to substrate ratio, both on a dry-weight basis) of 14.5% was recorded. The net yield was observed over 2±3 ¯ushes, with an inter¯ush period of ca. 7.d. Increase in bioconversion ef®ciency (BCE) decreased left-over spent substrate and increased the loss of growth substrate as CO and H2O. An increased solubility of the growth substrate was observed with increase in BCE. In general, increase in2 sugars, amino acids, and decrease in phenols, cellulose, hemicellulose and lignin were observed; however amino acids decreased at high levels of BCE. Likewise, the decrease in lignin content was not important above a 10% increase in BCE. Flush co-ordinated operation of the degradatory enzymes in the rice straw substrate was studied. Whilst CMC- ase, b-glucosidase, hemicellulase and protease showed a continuous increase over all the ¯ushes, laccase showed a decline only after the ®rst ¯ush, re¯ecting the possible non-requirement for lignin degradation thereafter. The growth of the fruiting primordium into a mature fruiting body took 72.h was characterized by an active increase in cellulase(s), hemicellulase(s) and, protease in particular. Laccase activity declined. This observation is associated with the requirement for carbohydrates and protein for growth and development of the fruiting bodies. Hexosamine content in the rice straw substrate increased until the end of spawnrun and declined thereafter, in accordance with the fructi®cation.

Item Type:	Article
Uncontrolled Keywords:	rice straw, morphogenesis, cropping, Pleurotus florida
Subjects:	600 Technology > 08 Food technology > 29 Microbiological food > 03 Mushroom
Divisions:	Fruit and Vegetable Technology
Depositing User:	Somashekar K S
Date Deposited:	06 May 2025 11:03
Last Modified:	06 May 2025 11:03
URI:	http://ir.cftri.res.in/id/eprint/19328

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