Reguladores vegetais na pós-colheita de uvas 'itália'

Abstract

The grape is a fruit that must be harvested when it ripe, because it does not ripen post harvest. Post-harvesting of fruits has been observed differently in recent years, due to high consumption, exports and especially to the look of the consumer that requires more product quality. The objective of the present study was to evaluate the use of some plant regulators in post harvesting 'Itália' table grape. The treatments were: Treatment 1: Control (distilled water); Treatment 2: 100 ppm auxin; Treatment 3: 100 ppm gibberellic acid ; Treatment 4: 1000 ppb of 1-methylciclopropene(1-MCP); Treatment 5: 100 ppm salicylic acid; Treatment 6: 100 ppm ethylene. The evaluations were performed on day zero (experiment installation) at 7 days and 14 days of storage at 16ºC and 75% relative humidity (RH) (simulating the temperature of a supermarket). The results were evaluated by the Tukey test at 5% probability. The pH of the wort ranged from 3.11 to 4.30, ideal values for the absence of microbiological contaminations. Glucose and fructose are the reducing sugars found in grapes. It was observed that on the seventh day of evaluation and in the treatment T6, that is in the grapes that were treated with 100 ppm Ethylene, the grapes presented higher contents of these reducing sugars. The total soluble solids, expressed in ºBrix, obtained a greater accumulation in the seventh day of evaluation, where it obtained a significantly greater result in the treatment T6, being these the grapes that were treated with 100 ppm Ethylene. Similar results were obtained by Almeida et al., (2014), working with 'Italy' grapes and studying the effect of different plant regulators on fruit post-harvest. The results were evaluated by the Tukey test at 5% probability. The use of ethylene in post-harvest 'Itália' table grapes has increased its sweetness.