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감귤 유전체 연구 동향 및 전망

Current status and prospects of citrus genomics

  • 김호방 ((주)바이오메딕 생명과학연구소) ;
  • 임상현 ((주)바이오메딕 생명과학연구소) ;
  • 김재준 ((주)바이오메딕 생명과학연구소) ;
  • 박영철 (제주특별자치도 농업기술원 감귤육종센터) ;
  • 윤수현 (국립원예특작과학원 감귤연구소) ;
  • 송관정 (제주대학교 생물산업학부 원예환경전공)
  • Kim, Ho Bang (Life Sciences Research Institute, Biomedic Co., Ltd.) ;
  • Lim, Sanghyun (Life Sciences Research Institute, Biomedic Co., Ltd.) ;
  • Kim, Jae Joon (Life Sciences Research Institute, Biomedic Co., Ltd.) ;
  • Park, Young Cheol (Agricultural Research and Extension Services, Jeju Special Self-Governing Province) ;
  • Yun, Su-Hyun (Citrus Research Institute, National Institute of Horticultural & Herbal Science) ;
  • Song, Kwan Jeong (Faculty of Bioscience and Industry, SARI, Jeju National University)
  • 투고 : 2015.12.16
  • 심사 : 2015.12.25
  • 발행 : 2015.12.31

초록

감귤은 전 세계적으로 가장 많이 생산되는 주요 과수작물이고 비타민 C와 구연산 및 감귤 고유의 플라보노이드를 비롯한 다양한 기능성 성분으로 인해 건강 기능성 식품 소재로도 각광받고 있다. 그러나 긴 유년기와 배우체 불임, 주심배 발생 및 고도의 유전적 잡종성 등 감귤 특유의 생식생물학적 특성으로 인해 교배를 통한 전통 육종의 품종개발에 있어서는 가장 어려운 작물에 속한다. 지구 온난화, 소비자 욕구 변화 등으로 인해 고품질 감귤의 안정적 생산과 품종 다양화를 위한 체계적 육종 프로그램의 도입이 시급한 실정이다. 감귤에서도 분자 육종 프로그램을 통한 품종 육성을 위해 세계적으로 가장 많이 재배되는 스위트 오렌지와 클레멘타인 만다린에 대한 고품질 표준 유전체 정보가 최근에 확보되었다. 표준유전체 서열을 기반으로 다양한 품종 및 교배집단들에 대한 유전체 해독, 비교유전체 분석, GBS 등을 통해 형질연관 마커 발굴, 유전자 기능 연구 등이 이루어질 것으로 전망된다. 아울러 다양한 전사체 분석이 이루어지고 있으며, 유전자 기능 및 유전자 co-expression 네트워크의 이해를 증진할 수 있을 것이다. 유전체 및 전사체 분석을 통해 확보한 대규모 SNP, InDel 및 SSR의 다형성 분자마커 big data를 이용한 고밀도 연관 및 물리 지도 작성이 이루어지고 있고, 궁극적으로 통합지도 작성이 이루어지게 될 것이다. 이를 통해 가까운 장래에 감귤 특이 주요 농업형질 연관 유전자의 정확도 높은 map-based 클로닝 및 빠르고 효율적인 분자표지 선발육종이 이루어질 것이다.

Citrus is an economically important fruit tree with the largest amount of fruit production in the world. It provides important nutrition such as vitamin C and other health-promoting compounds including its unique flavonoids for human health. However, it is classified into the most difficult crops to develop new cultivars through conventional breeding approaches due to its long juvenility and some unique reproductive biological features such as gamete sterility, nucellar embryony, and high level of heterozygosity. Due to global warming and changes in consumer trends, establishing a systematic and efficient breeding programs is highly required for sustainable production of high quality fruits and diversification of cultivars. Recently, reference genome sequences of sweet orange and clementine mandarin have been released. Based on the reference whole-genome sequences, comparative genomics, reference-guided resequencing, and genotyping-by-sequencing for various citrus cultivars and crosses could be performed for the advance of functional genomics and development of traits-related molecular markers. In addition, a full understanding of gene function and gene co-expression networks can be provided through combined analysis of various transcriptome data. Analytic information on whole-genome and transcriptome will provide massive data on polymorphic molecular markers such as SNP, INDEL, and SSR, suggesting that it is possible to construct integrated maps and high-density genetic maps as well as physical maps. In the near future, integrated maps will be useful for map-based precise cloning of genes that are specific to citrus with major agronomic traits to facilitate rapid and efficient marker-assisted selection.

키워드

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피인용 문헌

  1. Current status and prospects of molecular marker development for systematic breeding program in citrus vol.43, pp.3, 2016, https://doi.org/10.5010/JPB.2016.43.3.261