Abstract
ABSTRACT: This study evaluated the use of immersion water from peach palm leaves (PPLDA) as a component of the culture medium for the maintenance of Pleurotus spp. and the use of agricultural waste, peach palm leaves, as inoculum support for the fungi. The performance of the inoculum based on peach palm leaves (PPL) for the production of Pleurotus spp. fruiting bodies was compared with that using wheat grains (WG) as inoculum support. PPLDA culture medium (immersion water of peach palm leaves, dextrose, and agar) showed a lower radial velocity of mycelial growth for both fungi than that obtained with the culture medium WDA (wheat extract, dextrose and agar), commonly used as maintenance medium for Pleurotus spp. However, the type of inoculum support does not significantly influence the linear velocity of P. ostreatus mycelial growth, reaching 6.71 mm/day on wheat grains and 6.18 mm/day on peach palm leaves. Thus, when the inoculum based on peach palm leaves is utilized, the immersion water used for preparing this support can be used for preparing the PPLDA maintenance culture medium, diminishing the production costs of Pleurotus mushrooms. Data also showed that when Pleurotus sajor-caju was cultivated on peach palm leaves, using PPL as inoculum support, the fruiting bodies production parameters (Y = 47%, BE = 3% and Pr = 0.2 g/day) did not differ from that obtained using WG.
Highlights
Brazil is the largest producer, consumer, and exporter of hearts of palm in the world
In order to check the capacity of the inoculum based on peach palm leaves (PPL) to produce fruiting bodies, an experiment was conducted comparing this inoculum with that based on wheat grains (WG), generally used in solid state cultivation of Pleurotus
Evaluation of immersion water in the composition of the maintenance culture medium Full colonization of the Petri dishes containing WDA maintenance culture medium occurred in 5 days for P. sajor caju and P. ostreatus, with a significantly higher radial velocity of growth than that obtained with PPLDA (Fig. 2)
Summary
Brazil is the largest producer, consumer, and exporter of hearts of palm in the world. One way to reduce this environmental impact is reusing the waste generated from this process as a substrate for the production of edible mushrooms, providing the opportunity of another source of income for farmers (Philippoussis, 2009). The use of such waste in mushroom production can utilized due to the fact that some fungi are able to decompose lignocellulosic residues. In order to check the capacity of the inoculum based on peach palm leaves (PPL) to produce fruiting bodies, an experiment was conducted comparing this inoculum with that based on wheat grains (WG), generally used in solid state cultivation of Pleurotus
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