Science Links Japan | Effects of Ethephon Applications on the Ripening of 'Hayward' Kiwifruit on the Vine.

Effects of Ethephon Applications on the Ripening of 'Hayward' Kiwifruit on the Vine.

Accession number;99A0922078

Title;Effects of Ethephon Applications on the Ripening of 'Hayward' Kiwifruit on the Vine.

Author; OHARA HITOSHI (Chiba Univ., Fac. of Hortic.) OKAMOTO SATOSHI (Chiba Univ., Fac. of Hortic.) KISHIDA KEIKO (Chiba Univ., Fac. of Hortic.) OKAWA KATSUYA (Chiba Univ., Fac. of Hortic.) MATSUI HIROYUKI (Chiba Univ., Fac. of Hortic.) HIRATA NAOMI (Chiba Univ., Fac. of Hortic.) TAKAHASHI EIKICHI (Chiba Univ., Fac. of Hortic.)

Journal Title;Journal of the Japanese Society for Horticultural Science

Journal Code:F0626A

ISSN:0013-7626

VOL.66;NO.2;PAGE.273-281(1997)

Figure&Table&Reference;FIG.2, TBL.3, REF.17

Pub. Country;Japan

Language;Japanese

Abstract;Effects of ethephon application on the fruit ripening of 'Hayward' kiwifruit [Actinidia deliciosa (A. Chev.) C. F. Liang and A. R. Ferguson var. deliciosa] on the vine were investigated. In 1990, when 200ppm ethepon (dissolved with 50% ethanol) was applied at approximately 6-, 5-, 4-, 3-, 2- and 1-week prior to commercial harvest, the 4- and 3-week treatments made the fruits edible. Brix, flesh firmness, and titratable acidity of the fruits were about 13%, 0.6-1.2kg/cm2 and 1.1-1.2%, respectively. On the other hand, 50% ethanol application was ineffective on fruit ripening. When ethephon was applied at various concentrations 3 weeks before commercial harvest, the 50 and 100ppm treatments were ineffective on fruit ripening, whereas the 500ppm treatment hastened fruit ripening more than the 200ppm treatment. In 1991, when fruits were treated with 200ppm ethephon, they did not ripen as fast and uniformly as they did in 1990. We attribute the difference to the lower air temperature and shorter duration of sunshine during the 1991 experiments. From the above results, we postulated that the air temperature and duration of solar radiation after ethephon application strongly affect the kiwifruit ripening on the vine. (author abst.)

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