Published online by Cambridge University Press: 15 July 2005
Introduction. A recent laboratory study demonstrated a negative correlation between the ethylene production of fruit during ripening and the length of their commercial life. The aim of our work was to determine whether there is a putative relationship between ethylene production of fruit during ripening and the length of the growth period before ripening. A positive answer would make this an important parameter for early selection in breeding programs. Materials and Methods. Four banana varieties representing a broad range of growth period lengths were studied. Ethylene biosynthesis was examined through ethylene productionand content in free 1-aminocyclopropane-1-carboxylic acid (ACC)—the immediate precursor of the hormone—during fruit development and ripening. Fruit ripening was totally achieved on the plant. Results. Ethylene production started to be detected at the breaker stage. It peaked at the “fully dark-yellow–extremities included” stage for all varieties. Two varieties, i.e., Sowmuk and IDN 110, presented the highest production levels [(26 and 19) µL ethylene·h–1·kg–1 of fresh weight at peak, respectively). Galéo and Grande Naine had lower ethylene yields. The two most productive varieties also presented a drastic increase in free ACC at ripening onset. Conclusion. There is no relationship between ethylene production of bananas ripened on the plant and the length of the fruit growth period prior to ripening onset.