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http://dx.doi.org/10.12972/kjhst.20160054

Effects of Tree-spray of Calcium Agent, Coating Agent, GA4+7 + BA and Paper Bagging on Russet Prevention and Quality of 'Gamhong' Apple Fruits  

Moon, Young-Ji (Department of Horticultural Science, Kyungpook National University)
Nam, Ki-Woong (Department of Horticultural Life Science, Hankyung National University)
Kang, In-Kyu (Department of Horticultural Science, Kyungpook National University)
Moon, Byung-Woo (R&D center, M.Horticultural Technique Research Institute)
Publication Information
Horticultural Science & Technology / v.34, no.4, 2016 , pp. 528-536 More about this Journal
Abstract
This study was conducted to examine the effect of 0.4% of $CaCl_2$, $2H_2O$, $1mg{\cdot}L^{-1}$ of Calmodulin (CaM)-SH, 250-folds of coating agent (WE-36), 1,000-folds of $GA_{4+7}+BA$ and 3 types of paper bagging treatments on russet incidence and fruit quality attributes of 'Gamhong' apple. The pattern of russet occurrence was slightly different for 4 years (from 2012 to 2015) in 'Gamhong' apple. The russet occurrence was lowest in $GA_{4+7}+BA$ treatment at 20 days after full bloom (DAFB), compared with other treatments. The $GA_{4+7}+BA$ treatment increased fruit weight at 20 DAFB, while the other fruit quality attributes were not influenced. The russet occurrence was lower not only in a single bag application than in untreated ones but also in yellow bagging and discolored bagging applications than in a white bagging application. The russet occurrence in a bagging application was lower at 20 DAFB than at 30 and 40 DAFB, while fruit quality attributes were not affected by bagging applications. The russet incidence was lower in $GA_{4+7}+BA$ twice treatments at 20 and 30 DAFB, and calcium coated bag at 30 DAFB after $GA_{4+7}+BA$ treatment at 20 DAFB than in untreated fruit. The rate of russet incidence was lowest at equator region in $GA_{4+7}+BA$ treatment, compared with the other fruit regions. Overall, the results suggest that one and/or two applications of $GA_{4+7}+BA$ (1,000-folds) treatment at 20 DAFB should reduce the risk of russet incidence in 'Gamhong' fruit.
Keywords
calmodulin; fruit weight; plant growth regulator; temperature;
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