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Fruit Growth, Sugar, and Acid Characteristic in Leafy and Leafless Fruits of Satsuma Mandarin

온주밀감에서 유엽과와 직과의 생장과 당산 특성

  • Kim, Sat-Byul (Faculty of Bioscience and Industry, Jeju National University) ;
  • Oh, Eun Ui (Faculty of Bioscience and Industry, Jeju National University) ;
  • Park, Jae Hyun (Faculty of Bioscience and Industry, Jeju National University) ;
  • Yun, Su-Hyun (Citrus Research Station, National of Horticultural & Herbal Science) ;
  • Oh, Hyun Woo (Jeju Special Self-governing Province Agricultural Research & Extension Services) ;
  • Kang, Jong Hoon (Jeju Special Self-governing Province Agricultural Research & Extension Services) ;
  • Koh, Sang Wook (Citrus Research Station, National of Horticultural & Herbal Science) ;
  • Oh, Hyun Jeong (Biotechnology Regional Innovation Center, Jeju National University) ;
  • Song, Kwan Jeong (Faculty of Bioscience and Industry, Jeju National University)
  • 김샛별 (제주대학교 생물산업학부) ;
  • 오은의 (제주대학교 생물산업학부) ;
  • 박재현 (제주대학교 생물산업학부) ;
  • 윤수현 (국립원예특작과학원 감귤시험장) ;
  • 오현우 (제주특별자치도농업기술원) ;
  • 강종훈 (제주특별자치도농업기술원) ;
  • 고상욱 (국립원예특작과학원 감귤시험장) ;
  • 오현정 (제주대학교 생명과학기술혁신센터) ;
  • 송관정 (제주대학교 생물산업학부)
  • Received : 2012.07.02
  • Accepted : 2012.09.14
  • Published : 2012.12.31

Abstract

The study was conducted to investigate the effect of fruit bearing type with leafy (LY) and leafless (LS) fruits on fruit growth, sugar, and acid characteristics in satsuma mandarin. Fruit growth including fruit length, diameter, shape index (diameter/length), weight, and size distribution was not different between LY and LS fruits at ripening time. Total soluble solids (TSS) concentration of the fruit juice increased and acidity decreased continuously and then TSS:acidity ratio increased with fruit development from 100 days after anthesis to ripening time. Soluble sugar was continuously increased, whereas organic acid decreased. Theses tendencies were related to the increase of sucrose and decline of citric acid, respectively. However, there was no effect of fruit bearing type on TSS, acidity, and TSS:acidity ratio, and soluble sugar and organic acid composition in fruit juice. Also, photosynthetic rate and chlorophyll index with SPAD value were not different between leaves adjacent to LY and LS fruits. The results indicated that fruit growth and sugar and acid characteristics were not affected by fruit bearing type with leafy and leafless fruits in satsuma mandarin.

본 연구는 온주밀감에서 유엽과와 직과의 착과 형태에 따른 과실의 생장과 당산 특성을 구명코자 수행하였다. 과실의 종경, 횡경, 과형지수(횡경/종경), 과중 및 크기 분포를 포함하는 수확기 과실의 생장에 있어서 유엽과와 직과에 따른 차이는 없었다. 만개 후 100일부터 수확기까지 과실 발육과 더불어 지속적으로 과즙의 총가용성고형물의 농도는 증가하고 산도는 감소하여 당산비는 증가하였다. 유리당은 지속적으로 증가한 반면 유기산은 감소하였다. 이들 경향은 각각 자당의 증가와 구연산의 감소와 관계되었다. 그러나 착과 형태가 과즙의 총가용성고형물, 산도, 당산비, 유리당 및 유기산 조성에 미치는 영향은 나타나지 않았다. 또한 유엽과와 직과에 가장 인접한 잎에서의 광합성율과 SPAD 값에 의한 엽록소 지수 간에도 차이가 없었다. 본 연구결과는 온주밀감에서 유엽과와 직과의 착과 형태에 따른 과실의 생장과 당산 특성에 차이가 없음을 나타내었다.

Keywords

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