EFFECT OF OYSTER MUSHROOMS SPENT SUBSTRATE ON ARBUSCULAR MYCORRIZAL SYMBIOSIS IN FINGER MILLET (Eleusine coracana G.)
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Date
2019-09-17
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UNIVERSITY OF AGRICULTURAL SCIENCES, GKVK BENGALURU
Abstract
Spent mushroom substrate (SMS) is the substrate left after harvesting of
mushrooms. Experiment was conducted to study the effect of oyster mushrooms spent
substrate on Arbuscular mycorrhizae (AM) inoculum production. Hypsizygous ulmarius
showed significantly higher yield and bio-efficiency. Hypsizygous ulmarius spent
substrate shown higher nutrient content and narrow C: N ratio. Two oyster mushrooms
(Pleurotus eous and Hypsizygus ulmarius) spent substrates were incorporated to pots with
sterilized sand: soil as substrate and another set with unsterilized sand: soil as a substrate
with AM fungi Glomus mosseae and Glomus fasciculatum. Sorghum was used as a host
plant. Both the SMS were found to enhance mycorrhizal associations like percent root
colonization and AM spores in substrate. Among the two SMS, Hypsizygus ulmarius
SMS significantly increased number of spores and percent root colonization of Glomus
fasciculatum compared to Pleurotus eous SMS. Increased mycorrhizal association
characteristics was there in sterilized substrate compared to in unsterilized substate. The
effect of oyster mushroom spent substrate and AM fungi with and without recommended
dose of phosphorus in Finger millet, showed higher plant growth parameters like plant
height, number of leaves, fresh and dry weight of shoots and roots in plants with H.
ulmarius SMS and G. fasciculatum with RD of P. Plants with H. ulmarius and G.
fasciculatum with RD of P showed higher uptake of N, P, K and Zn. Increased
mycorrhizal associations like number of spores and per cent root colonization were found
in plants with H. ulmarius SMS and G. fasciculatum