Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Time-based Expression Networks of Genes Related to Cold Stress in Brassica rapa ssp. pekinensis

배추의 저온 스트레스 처리 시간대별 발현 유전자 네트워크 분석

  • Lee, Gi-Ho (Department of Horticultural Biotechnology, Kyunghee University) ;
  • Yu, Jae-Gyeong (Department of Horticultural Biotechnology, Kyunghee University) ;
  • Park, Young-Doo (Department of Horticultural Biotechnology, Kyunghee University)
  • 이기호 (경희대학교 생명과학대학 원예생명공학과) ;
  • 유재경 (경희대학교 생명과학대학 원예생명공학과) ;
  • 박영두 (경희대학교 생명과학대학 원예생명공학과)
  • Received : 2014.04.02
  • Accepted : 2014.06.08
  • Published : 2015.02.28
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Abstract

Plants can respond and adapt to cold stress through regulation of gene expression in various biochemical and physiological processes. Cold stress triggers decreased rates of metabolism, modification of cell walls, and loss of membrane function. Hence, this study was conducted to construct coexpression networks for time-based expression pattern analysis of genes related to cold stress in Chinese cabbage (Brassica rapa ssp. pekinensis). B. rapa cold stress networks were constructed with 2,030 nodes, 20,235 edges, and 34 connected components. The analysis suggests that similar genes responding to cold stress may also regulate development of Chinese cabbage. Using this network model, it is surmised that cold tolerance is strongly related to activation of chitinase antifreeze proteins by WRKY transcription factors and salicylic acid signaling, and to regulation of stomatal movement and starch metabolic processes for systemic acquired resistance in Chinese cabbage. Moreover, within 48 h, cold stress triggered transition from vegetative to reproductive phase and meristematic phase transition. In this study, we demonstrated that this network model could be used to precisely predict the functions of cold resistance genes in Chinese cabbage.

식물은 다양한 생화학적 및 생리적 과정에 속한 유전자들의 발현 수준을 조절함으로써 저온 스트레스에 반응 및 적응을 할 수 있다. 이러한 스트레스 환경은 막 기능 손실, 세포벽의 변화, 대사 속도 변화 등과 같이 부정적인 영향을 초래한다. 따라서 본 연구는 배추(Brassica rapa ssp. pekinensis)에서의 시간 변화에 따른 저온 스트레스 반응 기작 관련 유전자 상호발현 네트워크를 구축하였다. 배추의 저온 스트레스 네트워크는 2,030개 node, 20,235개 edge, 및 34개 connected component로 구성되었으며, 구축된 네트워크는 배추에서 저온에 관여하는 유전자가 생육도 조절한다는 것을 보여 주었다. 구축한 네트워크를 이용하여 배추에서 저온 스트레스($4^{\circ}C$) 처리가 미치는 영향을 분석한 결과 WRKY 전사인자와 살리실산 신호에 의해 chitinase 부동 단백질이 활성화되고, 전신적 획득저항성을 작동하기 위해 기공 개폐 및 탄수화물 대사과정이 조절됨을 확인하였다. 또한 저온 처리 후 48시간 후에 저온 스트레스가 영양생장에서 생식 생장 및 분열 조직 단계의 변화를 초래하는 것으로 나타났다. 본 연구에서 구축한 네트워크 모델은 배추에서 저온 저항성 관련 유전자들의 발현 패턴을 정확히 유추하는 데 이용될 수 있을 것이다.

Keywords

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