Abstract

This study examines the role of glycolysis in respiration of banana fruits stimulated by ethylene.Monoiodoacetate inhibited the respiration of banana peel sections in the absence of ethylene, and the inhibitory effect was strengthened in the presence of the gas (100μl/l). The experiment of incorporation of glucose-1-14C, and glucose-6-14C to carbon dioxide showed a conversion of the pathway from HMP to EMP with the advance of age in peel sections. But the period of alternation of the pathway did not coincide with that of the respiratory increase. However the incorporation rate of each penetrated glucose-14C to carbon dioxide changed with the increase of the respiration rate of peel sections.While the content of reducing sugar increased continuously in pulp and peel, the levels of glycolytic intermediates such as G-1-P, G-6-P, F-6-P, F-1, 6-diP, dihydroxyacetone P and pyruvate corresponded to respiratory changes of climacteric in pulp tissue. Especially, the change of F-1, 6-diP content was remarkable among the intermediates. Although the respiration of peel sections decreased after removal of ethylene, the levels of G-6-P and F-6-P were higher in this tissue than in the tissue in which the respiration was continuously enhanced with ethylene. On the contrary, this tendency was reversed for F-1, 6-diP, dihydroxyacetone P and pyruvate.These results suggest that the respiration climacteric with ethylene may be related to the enhancement of glycolysis and the step between the F-6-P and F-1, 6-diP may be concerned with a regulation of this pathway in pulp and peel of banana fruits.An alternation of temperature caused a change of respiration in green banana fruits. While the respiration was stimulated at 30°C, the levels of G-6-P and F-6-P decreased and other intermediates (F-1, 6-diP, dihydroxyacetone P, phosphoenol-pyruvate, and pyruvate) had no change. This data indicates a difference of metabolism of glycolysis between the respiration climacteric and activated respiration by temperature alternation.

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