Lipid profile of Pleurotus sajor caju

Abstract

The lipid profile of Pleurotus sajor caju was studied in relation to mycelial and sporophore growth and different cultural factors. The growth was characterised by lipid synthesis during mycelial growth and utilisation during sporophore growth. The degree of unsaturation increased during mycelial growth and decreased during sporophore formation. The fatty acid composition of mycelium and sporophore was similar, linoleic acid (C,8.2) being the most dominant acid in both. C:N ratio had a significant (P<0.05) positive effect on mycelial dry weight; however, per cent total lipids was similar. Non-polar lipids became more unsaturated as the temperature was raised from 10" to 25°C and pH from 3.0 to 6.0, but declined when the cultures were aerated. Mycelial dry weight increased significantly (P<0.05) when the liquid medium was supplemented with lipids. In general, fatty acids with carbon chain length C,, and C,, stimulated the growth of mycelium. Supplementation of solid substrate (cotton seed hulls) with safflower oil, soybean oil or rice bran significantly (P<0.05) increased the yield of sporophores. Total lipids and ratio of non-polar to polar lipids were not affected by lipid supplementation.

Protein enrichment and digestibility of soft rush (Juncus effusus) and rice residues using edible mushrooms Pleurotus ostreatus and Pleurotus sajor-caju

“…These lipids are destined for construction of the mushroom cell wall and for income induction (Nair et al 1989). As there was no fructification, the lipids were excreted and maintained in the medium, raising its percentage.…”

Lipid metabolism of Pleurotus sajor caju

“…Utilisation of lipids has been shown to be an important factor in the stimulation of mycelial and sporophore growth in P. sajor caju (Nair et al, 1989). Our present work demonstrates that the biosynthesis of lipids in the mycelium differs from that in the sporophore.…”

“…tri-acylglycerol) stimulated extra-cellular lipase activity. Increased lipase activity in the presence of corn oil observed in this study could explain in part the stimulatory influence of vegetable oils on mycelium and sporophore growth (Nair et al, 1989).…”

“…bisporus (Holtz & Schisler, 1971, 1972, 1986Holtz & Smith, 1979). Nair et al (1989) showed that linoleic acid stimulated sporophore production in P. sajor caju. The evidence provided in the present investigation suggests therefore that linoleic acid was utilised as a source of acetate for lipid biosynthesis in the sporophore.…”

“…Significant stimulation in mycelial and sporophore growth of Pleurotus sajor caju was obtained by lipid supplementation of solid as well as liquid substrates (Nair et al, 1989). Increase in mycelial growth of P. sapidus and P. ostreatus in submerged cultures by the addition of corn oil (Kurtzman, 1976;Ginterova & Janotkova, 1981) and in commercial sporophore production of Agaricus bisporus by supplementation of mushroom compost with lipids (Schisler, 1967) have also been reported.…”