Impact of substrate on the nutrient profile of Hypsizygus ulmarius (Bull.) Redhead, Elm Oyster fungus from Nigeria

Abstract

This study described the impact of different agricultural substrates on the nutrient compositions of Hypsizygus ulmarius (Bull.) Redhead, an elm oyster fungus, from Nigeria. This mycoorganism was grown on different local organic wastes. H. ulmarius carpophores were harvested on substrates such as rice bran (A), banana leaves (B), oil palm fibre (C), corn husks (D), sawdust + rice bran (E), oil palm fibre + rice bran (F) and saw dust (G). The experimental set up was completely randomized block design in three replicates. The data obtained were subjected to analysis of variance and the test of significance was subjected to Duncan’s multiple range test at 5% level of probability. Results showed that the substrates used had a significant impact on the nutrient contents of this macrofungus (P ≤ 0.05). The samples grown on rice bran (RB) had the highest calorie content (291.10), while those grown on banana leaves (BL) had the lowest (273.37) calories. The mineral content of the H. ulmarius was also influenced by the local substrate used. The highest levels of selenium (1.96 mg/100 g) and phosphorus (91.67 mg/100 g) were found in sporophores that were grown on banana leaves while the lowest values were found in fruit bodies grown on oil palm fibre (OPF), with 0.88 mg/100g of selenium and 80.94 mg/100 g of phosphorus. The highest vitamin D content was recorded in BL substrates (20.69 mg/100 g) followed closely by SDRB substrates (20.61 mg/100g) while the lowest was recorded on OPF substrates (14.51 mg/100 g). The implications of these observations on H. ulmarius on the nutrient values were discussed.