• G S Rawla

      Articles written in Proceedings – Plant Sciences

    • Influence of trace elements and organic growth factors on the growth ofPenicillium crustosum Thom

      S S Chahal G S Rawla

      More Details Abstract Fulltext PDF

      Penicillium crustosum requires Fe, Zn, Cu, Mo, B and d (+) biotin for its growth. It does not require the following trace elements and organic growth factors: Mn, Ca, Co, W, Ga, Sc, thiamine HC1, pyridoxine HC1,i-inositol, adenine sulphate, ascorbic acid, folic acid, guanine HO, nicotinamide, riboflavin, uracil, choline chloride and xanthine. In the deficiency of essential trace elements the mycelial dry weight is reduced, the contents of mycelial tips get vacuolised and exhausted, septa are formed at shorter intervals and sporulation is inhibited. Biotin deficiency also causes similar symptoms besides formation of distinct septa in conidiophoral apparatus with vacuolised contents.

    • Cellulase production byPenicillium pinophilum, Aspergillus quadricinctus andGliomastix murorum

      J K Sethi G S Rawla

      More Details Abstract Fulltext PDF

      Penicillium pinophilum, Aspergillus quadricinctus andGliomastix murorum secreted a complete extra-cellular cellulase complex comprising of endo-β-glucanase, exo-β-glucanase and β-glucosidase. The enzyme production was optimum with absorbent cotton and a combination of ammonium sulphate, urea and peptone inPenicillium pinophilum, with carboxymethylcellulose-7 MT and ammonium chloride inAspergillus quadricinctus, and with absorbent cotton and peptone inGliomastix murorum. The biosynthesis of cellulase was repressed by sugars in the presence of cellulose and only negligible amounts of cellulolytic enzymes were produced when sugars formed the sole carbon sources.

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