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Effects of Application Method of GA4+7+BA on Tree Growth and Fruit Characteristics of 'Gala' Apple  

SaGong, Dong-Hoon (Apple Research Station, National Institute of Horticulture & Herbal Science, Rural Development Administration)
Yoon, Tae-Myung (Department of Horticulture, Kyungpook National University)
Choi, Seak-Won (B&L AGRO, Gyeongbuk Institute for Bio-Industry)
Publication Information
Horticultural Science & Technology / v.28, no.4, 2010 , pp. 552-560 More about this Journal
Abstract
$GA_{4+7}$+BA, a plant growth regulator for induction of feathering in young apple tree and increasing fruit size, was applied by various methods on 'Gala'/M.9 apple trees in high density orchard for 4 years to investigate its effect on fruit and shoot growth. $GA_{4+7}$+BA($80-300mg{\cdot}L^{-1}$) increased fruit length, fruit weight, and L/D ratio regardless of application methods, but it did not affect soluble solid content, acidity, leaf area, and chlorophyll. Seed number was not affected by $GA_{4+7}$+BA application, however, more immature seeds was observed in treated 'Gala' fruit. Shoot growth was increased when spraying $GA_{4+7}$+BA at tree crown but not affected when spraying at fruit directly. More significant fruit growth was observed when $GA_{4+7}$+BA was applied on the fruits between late of May and early of June when fruit cell division ended; however, high concentration of $GA_{4+7}$+BA resulted in lower fruit storability because of lower firmness. Hence, more attention should be paid when applying high concentration of $GA_{4+7}$+BA to small sized fruit cultivars like 'Gala'.
Keywords
fruit firmness; Malus domestica Borkh.; return bloom; seed number; weight loss;
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