Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Effects of Calcium Concentrations of Coating Bag on Pericarp Structure and Berry Cracking in 'Kyoho' Grape (Vitis sp.)

괘대봉지의 칼슘 코팅농도가 '거봉'포도의 과피구조와 열과에 미치는 영향

  • Choi, Hyo-Min (Department of Horticultural Science, Chungbuk National University) ;
  • Son, In-Chang (Department of Horticultural Science, Chungbuk National University) ;
  • Kim, Dae-Il (Department of Horticultural Science, Chungbuk National University)
  • Received : 2010.02.12
  • Accepted : 2010.05.03
  • Published : 2010.08.31
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Abstract

The effects of calcium concentrations of coating bag treatment to reduce berry cracking were investigated through the changes of pericarp structure and berry cracking rate in 'Kyoho' grape. The soluble solids and anthocyanin contents in harvested grapes were highest at $18.1^{\circ}Brix$ and $2.56{\mu}g{\cdot}cm^{-2}$ in non bagging group compared with those of calcium coating bag treatments. The firmness of pericarp was lowest in non bagging group ($1.18kg{\cdot}5mm^{-1}{\O}$) compared with bagging treatments (1.23, 1.24, 1.27, $1.35kg{\cdot}5mm^{-1}{\O}$) which increased effectively in proportion to calcium concentration. As a result of histological observation of the fruit skin, the bagging with higher calcium concentration developed thicker epidermal and sub-epidermal layer of cell wall than that of non bagging. Moreover, the strengthened berry skin of calcium treatments effectively decreased berry cracking rate under critical turgor pressure. However, the 9% calcium coating bag treatment which was the most effective for cracking reduction seriously decreased marketability of harvested grape with white color staining on berry skin caused by eluted calcium from the coated paper bag. Based on our results, we recommend that 6% calcium coating bag be available for berry cracking reduction and higher quality production.

칼슘 코팅 봉지의 괘대처리가 포도 '거봉'의 과피 강화 및 열과 경감에 미치는 영향을 구명하고 효과적인 열과 방지용 괘대봉지 개발에 필요한 기초자료를 얻기 위해 실험을 수행하였다. 무대구의 가용성당함량과 안토시아닌 함량은 각각 $^18.1{\circ}Brix$, $2.56{\mu}g{\cdot}cm^{-2}$로 칼슘코팅 괘대구에 비해 높았다. 과피의 경도는 무대구에서 $1.18kg{\cdot}5mm^{-1}{\O}$으로 괘대 처리구의 12.3, 1.24, 1.27, $1.35kg{\cdot}5mm^{-1}{\O}$ 보다 낮았으며 고농도의 칼슘코팅 봉지를 사용할수록 경도가 증가하는 경향을 확인할 수 있었다. 과피의 형태적 관찰을 수행한 결과, 고농도의 칼슘코팅 괘대구일수록 표피 및 아표피층의 세포벽 두께가 증가하여 과피가 구조적으로 강화되었으며, 한계 팽압 하에서의 열과 발생률은 고농도의 칼슘코팅한 봉지를 처리할수록 열과 발생이 감소하여 열과 경감에 효과적임을 알 수 있었다. 하지만 처리구 중 열과 경감에 가장 효과적이었던 9% 칼슘 코팅 괘대구에서는 칼슘에 의한 과피 미려도 저하가 문제되었다. 따라서 열과 경감효과와 과실의 상품성을 고려했을 때 '거봉' 포도의 경우에는 6%의 칼슘코팅 봉지 처리가 바람직한 것으로 나타났다.

Keywords

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