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  Eur.J.Hortic.Sci. 80 (5) 240-248 | DOI: 10.17660/eJHS.2015/80.5.6
ISSN 1611-4426 print and 1611-4434 online | © ISHS 2015 | European Journal of Horticultural Science | Original article

Mushroom supplement added to casing to improve postharvest quality of white button mushroom

M. Adibian1 and Y. Mami2
1Higher Educational Complex of Saravan, Iran
2Department of Horticulture Science, Faculty of Agriculture, University of Guilan, Iran

SUMMARY
This project was done to study the effects of supplementing casing with ground corn and soybean seed applied at: 0 (control), 17, 34 and 51 g per 5 kg peat on color, weight loss, electrolyte leakage rate, total soluble solids, vitamin C, total phenol and antioxidant capacity of Agaricus bisporus. There were significant differences between supplemented and non-supplemented casings. Analyses of phenolic compounds revealed that mushrooms grown on casing supplemented with corn at 51 g per 5 kg peat contained more phenols than other treatments. The lowest amount of antioxidants in mushrooms was observed in the control. In addition, treatment of 51 g per 5 kg soybean and corn caused the highest total soluble solids. The color parameters for the color change of the materials were quantified by the hunter L (whiteness/darkness), a (redness/greenness) and b (yellowness/blueness) system. There were significant differences in mushrooms L*, a* and b* values in storage times of 8, 12 and 16 days among different supplements. Mushrooms supplemented with 51 g soybean and corn appeared to have higher L* values compared with other treatments. Amounts of protein content, electrolyte leakage, vitamin C and weight loss were significant if levels go up or down with storage time. The highest vitamin C, protein and antioxidant capacity were obtained with 34 and 51 g soybeans and 34 g corn, respectively. Results suggest that adding supplements in the casing increased the nutritional quality and shelf-life of mushrooms.

Keywords Agaricus bisporus, compost, corn, shelf-life, soybean

Significance of this study

What is already known on this subject?

  • Supplementation at casing to increase postharvest quality was a suitable practice in production of Agaricus bisporus. This is due to extra nutrition provided by supplements at this stage is directly utilized by mushroom mycelia for increased quality. The carbon units supplied to the compost in oil supplementation of the compost at casing were utilized to synthesize mannitol and fatty acids.
What are the new findings?
  • Supplementing with 34 g soybean and 51 g corn improved some quality indices of A. bisporus more than control and other treatments. Mushrooms supplemented with 51 g soybean and corn appeared to have higher L* values.
What is the expected impact on horticulture?
  • Supplementing substrate at casing is a relatively easy and low-cost cultural practice that may be successfully used to enhance yields, BE, nutritive values, post-harvest quality and maximize utilization of substrate.

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E-mail: mami_yad_1658@yahoo.com  

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Received: 5 December 2014 | Revised: 21 February 2015 | Accepted: 24 April 2015 | Published: 23 October 2015 | Available online: 23 October 2015

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