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2019 Vol.37, Issue 4 Preview Page

Research Article

Defoliation and Fruit Coloration in ‘Fuji’/M.9 Apple Affected by Cu-EDTA and Fe-EDTA Foliar Spray
Heon-Kyu Lim1†
,
Hyunsuk Shin2†
,
In-Chang Son3
,
Youngjae Oh14
,
Keumsun Kim1
,
Hyeondae Han1
,
Sewon Oh1
,
Daeil Kim1*
1Department of Horticultural Science, Chungbuk National University
2Department of Horticultural Science, Gyeongnam National University of Science & Technology
3Planning and Coordination Division, National Institute of Horticultural and Herbal Science, Rural Development Administration
4Department of Horticultural Science, IFAS Gulf Coast Research and Education Center, University of Florida
* Corresponding Author
† These authors contributed equally to this work.
31 August 2019. pp. 448-454
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Abstract

The objective of this study was to determine whether two chelate compounds (Cu-EDTA and Fe-EDTA) applied as a foliar spray could effectively defoliate ‘Fuji’/M.9 apple trees and improve fruit quality and fruit coloration. Foliar spray with these two chelate compounds at 30 days before harvest significantly defoliated fruit cluster leaves, which improved light interception of ‘Fuji’/M.9 apple trees. However, Cu-EDTA non-selectively defoliated bourse shoot leaves and true leaves, which are involved in photosynthesis during the late period of fruit growth. Cu-EDTA markedly reduced fruit weight, soluble solids content, and fruit coloration compared to Fe-EDTA. Regarding Fe-EDTA concentration, 3% Fe-EDTA was more effective at enhancing fruit coloration but lowered fruit weight compared to 1% Fe-EDTA. Consequently, we found that 1% Fe-EDTA induced more selective defoliation of fruit cluster leaves than Cu-EDTA and was more effective in improving fruit quality and fruit coloration of ‘Fuji’ apple trees.

Keywords
abscission
anthocyanin
chemical defoliation
coloration, leaf
coloration, leaf

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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :원예과학기술지
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 37
  • No :4
  • Pages :448-454
  • Received Date : 2019-02-07
  • Revised Date : 2019-04-23
  • Accepted Date : 2019-05-03
  • DOI :https://doi.org/10.7235/HORT.20190045
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