Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
권호 표지

Effects of Bagging Periods on Pericarp Characteristics and Berry Cracking in 'Kyoho' Grape (Vitis sp.)

괘대시기가 '거봉' 포도의 과피 특성과 열과에 미치는 영향

  • Son, In-Chang (Department of Horticultural Science, Chungbuk National University) ;
  • Kim, Dae-Il (Department of Horticultural Science, Chungbuk National University)
  • Received : 2010.01.04
  • Accepted : 2010.02.09
  • Published : 2010.06.30
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Abstract

The berry growth and pericarp characteristics were characterized to confirm the effects of bagging periods on berry cracking during berry development in 'Kyoho' grape. The berry weight was the highest at 13.4 g in late period of bagging treated at 7 to 9 weeks after full bloom (WAFB) as compared with the lowest of 12.3 g in total period bagging. The berry cracking rate under critical turgor pressure in the non-bagging control was 53.3%, while those of bagging treatments were decreased in the order of 42.7%, 37.3%, 33.3%, and 18.7% in bagged during 3 to 9, 3 to 5, 5 to 7, and 7 to 9 WAFB, respectively. In the results of observation on histological characteristics of pericarp, berry lenticels of whole bagging treatments had smaller and normal shape compared with non-bagging control treatment. Especially on the pericarp of late period bagged during 7 to 9 WAFB, suberization around stomata and micro-cracking were not observed and structural strength of pericarp was increased with thicker sub-epidermal layer and cell wall. Therefore, the results indicate that bagging treatment for two weeks just before the veraison when the day length and daylight is relatively longer and stronger can effectively reduce berry cracking by strengthening structure of pericarp in 'Kyoho' grape.

과립 비대기 동안의 괘대시기가 '거봉' 포도의 열과에 미치는 영향을 구명하기 위하여 포도 과립의 생육 및 과피의 특성 변화를 조사하였다. 포도 과립중은 만개후 7-9주간 괘대한 후기 처리구에서 13.4g으로 가장 높았으며, 전기간 괘대구가 12.3g으로 가장 낮았다. 한계팽압에서 포도 과립의 열과율이 무대구에서 53.3% 이상 발생하여 가장 높았던 반면, 처리구에서는 전기간 괘대구(42.7%), 초기 괘대구(37.3%), 중기 괘대구(33.3%), 후기 괘대구(18.7%)의 순으로 열과가 경감되었다. 과피의 조직학적 특성을 관찰한 결과, 무대 처리에 비해 괘대 처리구에서 과피 표면의 과점의 크기가 작았으며 형태가 건전하였다. 특히 후기 괘대구에서는 기공 주변이 코르크화와 미세균열이 관찰되지 않았으며, 과피의 아표피층과 세포벽의 두께가 증가하여 과피가 구조적으로 강화되었다. 따라서 상대적으로 일조시간이 길고 광도가 높은 변색기 직전에 2주간 괘대처리가 '거봉' 포도의 과피 구조를 강화시켜 열과 겸감에 효과적임을 확인할 수 있었다.

Keywords

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