カキ‘刀根早生’果実の流通中の熟柿化現象の原因究明と防止技術の開発

概要

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　Field grown ‘Tonewase’ Japanese persimmon had beencultivated as a leading persimmon variety in WakayamaPrefecture without any problem until 1993. Thereafter,however, a rapid fruit softening during postharvest distribution occurred and its rate increased every year coinciding with retardation of the temperature decrease in September which is the ripening season for the fruit. This produced a serious loss to the Prefecture. We clarified the mechanism of this fruit softening and developed a completely suppressible technique based on that mechanism.　In ‘Tonewase’ persimmon fruit, water stress acted as aprimary signal that triggered stress-ethylene production inthe tissue of calyx through stimulating the expression of oneof the ACC synthase genes, DK-ACS2, a stress responsibleethylene biosynthetic gene. This ethylene diffused into pulptissue of the fruit, where transcription of DK-ACS1 forripening-ethylene production was activaled through a positivefeedback system, which in turn caused rapid fruitsoftening.　This fruit softening derived from stress-ethylene wascompletely suppressed by packaging the fruit in perforatedpolyethylene bags or by using carton boxes laminated witha thin layer of plastic film. These techniques that alleviated water loss from fruit completely solved the rapid softening problem during postharvest distribution in ‘Tonewase’ fruit.
岡山大学農学部の論文