The Effect of IBA and Tryptophan on Yield Quality and Postharvest of Button Mushroom (Agaricus bisporus)

Mushroom (Agaricus bisporus) has a short shelf life, and browning, weight loss, and microbial contamination are significant changes that occur after mushroom harvesting, reducing their economic value. Vitamins, hormones, and amino acids improve mushroom growth and increase the yield. To investigate the effect of IBA and tryptophan on growth and yield of button mushroom and its post-harvest life, this study was done in two separate experiments in the mushroom factory post-harvest storage. The experiment was performed as a factorial experiment based on a randomized complete block design with three replications, including three levels of 0, 1, and 2 mM IBA and three levels of 0, 3150, 6300 mg/kg of the amino acid tryptophan. The results showed that the nutritional supplements used in this study effectively increased vegetative growth and yield as well as cap diameter, ion leakage and two hardnesses measured in T1 and base diameter, water loss and total weight.   1 mM IBA treatment had the highest dry weight, water loss and total weight and 2 mM IBA treatment had the highest base diameter and cap and ion leakage. In general, although the yield was higher in 6300 mg/kg tryptophan treatment but vegetative and post-harvest traits at 3150 mg/kg tryptophan were the highest. On the other hand, the use of lower concentrations of IBA is recommended due to better or equal results with higher concentrations.