Abstract
Aroma volatile changes of netted muskmelons (Cucumis melo L. cv. Earl’s Together) during growth, maturation and ripening stages were investigated in relation to ethylene and respiration production. While melons exhibited a small respiration peak 48 days after pollination (DAP), ethylene production was negligible throughout the developmental stages. Thus, this cultivar should be classified as a non-climacteric type. Using headspace SPME, 27 aroma volatile compounds were identified (10 esters, 8 aldehydes, 7 alcohols, 1 sulfur compound and 1 terpene). Among them, (Z)-6-nonenal, nonanal, (E,Z)-2,6-nonadienal and (E)-2-nonenal were largely and mainly found in immature fruits, and they were still major to the later stages. However, from 45 DAP many esters appeared and their percentages increased as fruits were ripening. Two major ester formation genes, alcohol dehydrogenase and alcohol acyl transferase transcriptions were up-regulated to some extent. For that reason, it may be possible to form ester compounds in non-climacteric melons through ethylene independent pathways.
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