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2016 Vol.34, Issue 5 Preview Page
Differences in Softening of ‘Shigyoku’ and ‘Heukboseok’ Grapes during Harvest Period Appears to be Related to Differences of Pedicel Vascular Bundle

과경 유관속 조직의 차이에 따른 ‘자옥’과 ‘흑보석’포도의 수확기 과실 연화

MyungHee Jung1
,
Jin Pyo Oh1
,
JunHyeok Kim1
,
YoSup Park1
,
YongHee Kwon2
,
Hee-Seung Park1*
정 명희1
,
오 진표1
,
김 준혁1
,
박 요섭1
,
권 용희2
,
박 희승1*
1Department of Integrative Plant Science, School of Bioresource and Bioscience, Chung-Ang University
2Fruit Research Division, National Institute of Horticultural & Herbal Science
1중앙대학교 생명자원공학부 식물시스템과학전공
2농촌진흥청 국립원예특작과학원 과수과
*교신저자. *Corresponding Author. 
31 October 2016. pp. 692-700
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Abstract

The objective of this study was to determine the differences in fruit growth, fruit quality, and particularly the pedicel vascular bundles of ‘Shigyoku’ and ‘Heukboseok’ grapes, which appeared to be different in softening at harvest. ‘Shigyoku’ grape matured faster (by about 20 days) than ‘Heukboseok’ grape with slight fruit enlargement after veraison. However, fruit of ‘Heukboseok’ grapes showed remarkable enlargement in both the primary and secondary fruit enlargement periods. Hypodermal cell layers were not different after veraison in ‘Shigyoku’ grape, but degradation of the hypodermis cell wall continued in ‘Heukboseok’ grape, resulting in a gradual decline in firmness. The numbers of hypodermal cell layers in ‘Shigyoku’ and ‘Heukboseok’ grapes were 14.2 and 9.0, respectively. The average content of soluble solids in ‘Shigyoku’ grape (19.5°Brix) was significantly (p ≤ 0.01) higher than that of ‘Heukboseok’ grape (17.0°Brix). Xylem of the pedicel did not differ between the two varieties. However, average phloem area after veraison of ‘Shigyoku’ grape (19044.8 μm2) was about 1.8 fold greater than that of ‘Heukboseok’ grape (10509.4 μm2), based on the number of cells constituting the phloem. The cell number and area of the phloem might affect the accumulation of sugars, the main constituents of the cell wall, thus maintaining the firmness of grapes until late maturity. Therefore, the increased softening of ‘Heukboseok’ grapes at harvest might due to their phloem structure.

Keywords
cell division
cell size
firmness
global warming
phloem
xylem

본 연구는 수확기 과실의 연화 정도에 차이를 보이는 ‘자옥’과 ‘흑보석’ 포도를 대상으로 과실 발달과 과실 품질 및 특히, 과경 유관속조직의 차이를 비교하고자 실험하였다. ‘자옥’ 포도는 ‘흑보석’ 포도에 비해 성숙이 20일 정도 빠르고 변색기 이후의 과실 비대가 크지 않으나 ‘흑보석’ 포도는 1차 과실비대기와 2차 과실 비대기 모두 비대 양상이 두드러졌다. 변색기 이후 ‘자옥’ 포도의 아표피를 구성하는 세포층수는 변화가 없었으나 ‘흑보석’ 포도에서는 아표피층의 세포벽 분해가 계속 진행되어 점진적으로 경도가 하락하였으며 최종적으로 두 품종의 아표피를 구성하는 세포층수는 14.2와 9.0층으로 조사되었다. 가용성 고형물 함량은 ‘자옥’ 포도가 평균 19.5°Brix로 ‘흑보석’ 포도의 평균 17.0°Brix 보다 높은 것으로 조사되었다. 과경의 물관부는 품종간 차이를 보이지 않았으나 변색기 이후 체관부의 평균 면적은 ‘자옥’ 품종이 19044.8μm2, ‘흑보석’ 품종이 10509.4μm2로 ‘자옥’ 품종이 약 1.8배 정도 큰 것으로 나타났으며 이는 체관부를 구성하는 세포 수의 차이인 것으로 조사되었다. 체관부 세포의 수와 면적은 세포벽의 주 구성성분인 당을 축적하는데 영향을 미치는 것으로 생각되며, 경도를 늦은 성숙기까지 높게 유지하는데 유리하게 작용하는 것으로 판단되었다. 따라서 상대적으로 ‘흑보석’ 포도가 수확기에 쉽게 물러지는 것은 체관부의 역할이 큰 것으로 생각되었다 .

키워드
경도
물관부
세포 분열
세포 크기
체관부
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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :한국원예학회
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 34
  • No :5
  • Pages :692-700
  • Received Date : 2016-05-10
  • Revised Date : 2016-05-12
  • Accepted Date : 2016-07-01
  • DOI :https://doi.org/10.12972/kjhst.20160072
Journal Informaiton Horticultural Science and Technology Horticultural Science and Technology
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