Qualidade pós-colheita de Rosa Hybrida L. cv avalanche tratadas com produtos naturais

Abstract

The discussion about the use of natural products have been increasing by considering their non-toxic properties. Also, the concern about the use of the chemicals has been increasing, particularly with regard to people health and the effect on the environment. In the floriculture agribusiness the use of chemicals is intense, aimed to produce flowers with quality. In this experiment objective to evaluate the effect of natural products with preservative properties to improve the quality of roses after harvest.For that, roses cultivar 'Avalanche'were treated with a solution containing essential oils of peppermint, eucalyptus, clove, lemongrass and cinnamon and different doses of methyl jasmonate (125, 250, 500 and 1000 μmL-1), and a control (pure water). The solutions were sprayed on flower buds and after the treatments, the flowers were storage at low temperature (4° C) for 2 or 6 days, and then were transferred to a dark room on 16° C. In each 2 days, the flowers were evaluated observing the fresh mass, water absorption, and visual quality, which was measured by a range of notes, for darkness, turgidity and peduncle slope. Samples were collected in order to determinate the total sugars. Both in essential oils experiment as methyl jasmonate, it was observed that two days of storage at low temperature promote higher quality of the buds until the 10th day after harvest. The use of essential oil of eucalyptus helped in Botrytis cinerea control and maintenance of the quality. The use of the methyl jasmonate sprayed on flower stalks was not effective in maintaining postharvest quality of the flowers.