Desenvolvimento inicial e pós-colheita de alpínia

Abstract

Vase life longevity of cut flowers is related to pre and postharvest factors, being the pre-harvest factors are referring to floral ripening stage and the cultivation conditions, and the postharvest factors are attributed to the conservation conditions. Thus, this work was carried out with the purpose of evaluating the effects of different levels of shading, spectral quality of screens and spacing in the initial development of ‘Jungle Queen’ and ‘Jungle King’ gingers, and to analyze the influence of different gibberellic acid and carnauba wax concentrations in quality and postharvest longevity of ‘Red Ginger’. In the first experiment, rhizomes-seed were planted in 5 different environments (full sun, black screens with 30% and 50% shading, blue and red screens with 50% shading) and 2 spacing per plants (0.8 x 1.0 m and 0.8 x 1.5 m). Rhizomes-seed remained dormant from April to August, and the shooting of theses rhizomes began with the temperature increasing. The spacing did not influence the initial development of plants. Shading of 50%, associated with the black, blue or red screens, favored the initial development of ‘Jungle Queen’ and ‘Jungle King’ gingers. The second experiment consisted of pulsing for 24 hours in red ginger floral stems at concentrations 0, 5, 25, 50 and 100 mg L-1 of GA3, stored at temperature 18 ºC and 91% RH for 31 days. Concentration of 5 mg L-1 of GA3 prolonged the commercial durability, promoted lower changes in the soluble sugars levels in bracts and reduced peroxidase and polyphenoloxidase activities in bracts and in the base of floral stems. The third experiment tested the spraying of carnauba wax in the red ginger inflorescences at concentrations 0.0; 1.5; 3.0; 6.0; 9.0; 12.0 and 15.0 wax. It can be recommended for red ginger inflorescences spraying carnauba wax in concentrations up to 3%.