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• W2247244401 abstract "A comprehensive genetic and optimisation of the growth conditions study of fifteen Pleurotusspecies and strains from Belgian Coordinated Collections of Microrganisms/ Mycotheque del’ Universite Catholique de Louvain (Agro) Industrial Fungi and Yeasts Collection wascarried out. The optimal environmental conditions for the Pleurotus strains were determinedby establishing variability in growth response and primordium development on agar mediaover a range of growth parameters: osmotic potential (− 0.5 MPa to − 5.0 MPa), temperature(5 to 40 °C) and pH (2 to 12). The maximum growth rates and the optimum conditions forgrowth varied for the different strains. A Pleurotus ostreatus strain able to grow and fruit atelevated temperatures (25 °C) was identified that has potential for cultivation in the tropics.Nine strains were identified with high growth rates. Primordia were produced at low pH (4 to6), at suboptimal growth temperatures (£ 25 °C), and under moderate water stress (−0.5 to−3.5 MPa). An investigation into the effect of micro-solute concentration changes on thegrowth response of the Pleurotus species was carried out on agar media using microconcentrationsof polyethylene glycol (PEG) 6000, potassium chloride (KCl) and sodiumchloride (NaCl). The solutes at micro-concentrations ranging from 0.35 g l-1 to 1.00 g l-1 forPEG 6000, 1.50 g l-1 to 3.85 g l-1 for KCl and 0.60 g l-1 to 1.54 g l-1 for NaCl produced a twoto three fold increase in the growth rate of the Pleurotus strains, which has potentialapplication in oyster mushrooms (Pleurotus species) spawn production and cultivation. Theoptimum micro concentrations of combined KCl and NaCl solutes of 2.70 g l-1 KCl: 1.08 g l-1NaCl or 3.85 g l-1 KCl: 1.54 g l-1 NaCl at 20 °C; and 1.50 g l-1 KCl: 0.60 g l-1 NaCl or 2.70 g l-1 KCl: 1.08 g l-1 NaCl for both 25 °C and 30 °C; of PEG 6000 of 0.90 g l-1 (20 °C) and 0.65 gl-1 (25 and 30 °C) were identified. Development of alternative spawn substrate protocols wasdone by varying the boiling, soaking periods for the substrates (maize [Zea mays] grain,maize cobs, pumpkin seeds [Cucurbita sp.] and bean seeds [Phaseolus vulgaris]). Maizegrain, pumpkin seeds and maize cobs with a water content of 35 to 39 %, 41 to 47 % and 64% respectively have potential use as alternative substrates to wheat (Triticum aestivum) grainin Pleurotus species spawn production. The feasibility of creating novel media formulationsfor culturing Pleurotus strains was investigated by developing various whole wheat grain andcrushed wheat grain mixtures. The novel media formulations of 1:3 (w/v) to 1:5 (whole wheatgrain: distilled water) and 1:3 to 1:15 (crushed wheat grain: distilled water) were determinedto be optimal for use as low-cost alternative media for culturing Pleurotus species for spawnproduction and cultivation purposes. An investigation in the use of Tyndallisation as a meansof sterilising the growth media for spawn production was carried out by modifying primarilythe boiling times and number of days of incubation. Tyndallisation of 30 minutes boilingdaily for three days (wide-mouthed bottles) and 5 minutes boiling for four days (narrowmouthedbottles) were optimal for production of Pleurotus species spawn. Alternative singlesubstrates and substrate mixtures (1:1) were determined by growth and basidiome productionon thatch grass (Agropyron sp.), banana fronds (Musa sapientum), wheat straw, sage(Coleochloa setifera); banana + sage, banana + grass, banana + wheat straw and sage + grass.Grass and sage were the best substrates singly and in combination with banana. Biologicalefficiencies greater than 140 % were obtained. Positive and negative synergistic effects onprimordium development dependant on the strain and substrate mixture were noted. Geneticvariability of Pleurotus species and strains was investigated by sequencing the internaltranscribed spacer (ITS) region of ribosomal DNA. The 15 Pleurotus strains separated intofour clusters. The internal transcribed spacer sequences analysis suggested that strain 31674was misidentified as P. sajor-caju instead of P. ostreatus. The value of noting the history ofthe strain in phylogenetic analysis was proposed. This study recommends BCCM/MUCLstrain 31017 (P. sajor-caju) for spawn production and cultivation processes due to having thecharacteristics of high growth rate, high biological efficiency, prolific primordial formationand moderate xerotolerance which are highly desirable for spawn production and cultivationprocesses." @default.
• W2247244401 created "2016-06-24" @default.
• W2247244401 creator A5037980054 @default.
• W2247244401 date "2008-09-01" @default.
• W2247244401 modified "2023-09-26" @default.
• W2247244401 title "Optimisation of the growth conditions and genetic characterisation of Pleurotus species" @default.
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