Influência da temperatura na respiração, produção de etileno e longevidade de inflorescências de esporinha

Abstract

RESUMOO objetivo do trabalho foi avaliar a influência da temperatura na respiração e produção de etileno em inflorescências de esporinha (Consolida ajacis), e se a produção de CO 2 poderia ser utilizada como indicador da longevidade das flores. As hastes foram colhidas, colocadas em vasos e armazenadas em temperatura de 5, 10, 15, 20, 25, 30, 35, e 40 o C até a completa senescência das flores. Ocorreu variação temporal similar na respiração e produção de etileno em função da elevação da temperatura, com produção máxima de 1. ABSTRACT INFLUENCE OF TEMPERATURE ON RESPIRATION, ETHYLENE PRODUCTION AND LONGEVITY OF Consolida ajacis INFLORESCENCESThe goal of this experiment was to evaluate the influence of temperature on respiration and ethylene production of cut flowers of Consolida ajacis and to determine if the CO 2 production could be used as index to predict the flower longevity. The inflorescences were harvested and stored at 5, 10, 15, 20, 25, 30, 35, e 40 o C until complete senescence. The flower respiration and ethylene production showed similar temporal variation with the increase on the temperature, reaching maximal production of 1854 mL CO 2 kg -1 h -1 and 11.28 mL C 2 H 4 kg -1 h -1 under 30 o C e 40 o C, respectively. The Q 10 factor between 5 and 30 o C ranged from 1.11 to 2.89, similar to other horticultural products. The flower longevity was negative related to the increase of temperature between 5 and 30 o C. The estimated vase life was reduced from 11.9 to 4.1 days when the storage temperature was increased from 5 to 30 o C. Flowers kept at 35 and 40 o C had similar longevity to those stored at 30 o C.