Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
권호 표지

Fruit Quality Characteristics and Pithiness Tissue Occurrence with Fruit Gravities in 'Niitaka' Pear Fruit

'신고' 배의 비중에 따른 과실 품질 특성과 바람들이 발생

  • Cho, Joon-Shik (Department of Horticulture, Institute of Agricultural Science and Technology, Chonnam National University) ;
  • Kim, Wol-Soo (Department of Horticulture, Institute of Agricultural Science and Technology, Chonnam National University) ;
  • Lee, Sang-Hyun (Korean Pear Research Organization, Chonnam National University)
  • 조준식 (전남대학교 농업생명과학대학 원예학과) ;
  • 김월수 (전남대학교 농업생명과학대학 원예학과) ;
  • 이상현 (전남대학교 배수출연구사업단)
  • Received : 2009.10.06
  • Accepted : 2010.04.22
  • Published : 2010.08.31
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Abstract

The primary objective of this study was to determine the relationship between fruit quality characteristics and pithiness fruit occurrence for confirming occurrence factors of pithiness tissues in 'Niitaka' pears ($Pyrus$ $pyrifolia$ Nakai). Fruits were harvested 4 times in 1 week intervals from 160 days after full bloom (DAFB) to 181 DAFB. Harvested fruits were separated with the specific gravity by Archimedes laws. Also, with specific gravity level in pear fruit, sugar content, acidity, and texture profile analysis (TPA) were investigated. Final verifiability of pithiness fruit was approved by eye observation at 90 days after storage. Also, in ASS (Alcohol Soluble Solid) and AIS (Alcohol Insoluble Solid), calcium contents were investigated. Although the differences in sugar and organic acid content were not significant in fruits divided by gravity, flesh hardness was depressed in fruits that showed low gravity. These results were more conspicuous in late harvested fruits (at 174 and 181days after full bloom) which showed low gravity, representing less content of AIS content and calcium in ASS and AIS when compared with early harvest fruits. Fruits of lower gravity below 1.0 measured with dipping induced the progression of pithiness symptom up to 76%. Consequently, harvest timing is a more concise factor in pithiness fruit occurrence although those symptom also affected by storage condition. Furthermore, the cause of pithiness fruit occurrence by late harvest is due to the lower cell wall binding calcium.

본 연구는 '신고' 배 품질저하의 주요원인으로 대두되고 있는 바람들이과의 확인을 위하여 과실 비중에 따른 배 과실의 품질특성과 바람들이 발생과의 관계를 구명하기 위하여 수행되었다. 수확된 과실들의 바람들이 증상 구분은 아르키메데스법을 이용 비중에 따라 구분하였고 과실들의 물성과 당함량을 측정되었다. 최종적인 바람들이과의 확인은 저장한 후 저장 90일째에 각각의 과실을 칼로 잘라 육안으로 확인하였다. 알코올 수용성 분획(Alcohol Soluble Solid)과 알코올불용성 분획(Alcohol Insoluble Solid)에서의 칼슘함량을 조사하였다. 비중에 따라 구분한 배 과실 group간 당함량과 산함량의 차이는 나타나지 않았으나 물성의 차이는 뚜렷했으며 특히 경도는 비중이 낮은 group일수록 낮게 나타났다. 수확시기가 늦을수록 비중이 낮은 과실이 많아졌으며 이러한 현상은 만개 후 174일과 181일에 수확한 과실들에서 더욱 뚜렷하게 나타났다. 수확기가 늦어질수록 비중이 낮은 과실과 정상과의 알코올불용성물질의 차이는 크게 나타났다. 또한, 비중이 낮은 과실과 정상과에서의 알코올불용성분획과 알코올수용성 분획에서의 칼슘함량은 수확시기가 늦어질수록 낮았으며, 알코올불용성분획에서 비중이 낮은 과실이 정상과보다 칼슘 함량이 낮았다. 결과적으로 비중이 낮아짐에 따라 나타나는 배 과실의 바람들이과 발생은 저장기간과 조건에 영향도 있지만 그보다 수확시기가 늦을수록 높아졌다. 수확시기가 늦을수록 세포벽에 결합되어 있던 칼슘의 함량이 감소되면서 세포벽의 견고성이 약화되어 바람들이 발생이 높아졌다.

Keywords

References

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