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The maximum level of ethylene production is closely related to fruit ripening and storage potential in Asian pears. In a previous study, we identified two markers (A and B) linked to high and moderate ethylene production during fruit ripening, respectively, by restriction fragment-length polymorphism analysis of two 1-aminocyclopropane-1-carboxylate (ACC) synthase genes ( PPACS1  and  PPACS2 ). In this study, a total of 152 cultivars were categorized into four marker types (AB, Ab, aB, and ab); types AB and Ab show high levels, aB a moderate level, and ab a low level of ethylene production during fruit ripening. A large number of ab and aB cultivars but few AB and Ab cultivars were observed. It suggests that there has been a decrease in high ethylene producers by artificial selection because of short shelf life. The ab cultivars are a good genetic resource for production of new cultivars with a long shelf life. Such information on marker types is useful for breeding strategies aimed at improving storage ability in Asian pears.

hortscience

Identification of Climacteric and Nonclimacteric Phenotypes of Asian Pear Cultivars by CAPS Analysis of 1-Aminocyclopropane-1-Carboxylate Synthase Genes