Effect of Gaseous H2S Fumigation on Aspergillusnige Inhibition and Postharvest Quality of Table Grape
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Abstract:
The effects of intermittent fumigation with gaseous hydrogen sulfide (H2S) on postharvest disease control and storage quality of the grape were studied. The table grape (Vitis vinifera L. cv Thompson Seedless) was fumigated intermittently by 500 μL/L H2S. The effects of H2S treatment on the disease index, lesion diameter, and fruit storage quality were analyzed. The disease-related enzymes were measured as well. The results showed that H2S intermittent fumigation significantly reduced the disease index of inoculated fruits and inhibited the expansion of lesion diameter. The weight loss, drop rate, decay rate as well as the firmness were reduced by H2S. The H2S intermittent fumigation delayed the soluble solids (TSS), titratable acid (TA) and ascorbic acid. The H2S treatment also decreased the rate of chlorophyll decomposition and maintained its content. The activities of defense enzymes, such as POD, PPO and PAL, were significantly enhanced by H2S fumigation treatment. These results suggested that the senescence improvement and the disease-resistance enhancement of postharvest grapes may be attributed to the induction of H2S. The H2S intermittent fumigation showed special prospects in disease resistance and quality improvement of postharvest fruits.
