한국작물학회지 (KOREAN JOURNAL OF CROP SCIENCE)

  • 제66권1호
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  • Pages.37-71
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  • 2021
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  • 0252-9777(pISSN)
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  • 2287-8432(eISSN)
한국작물학회 (The Korean Society of Crop Science)
권호 표지
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유채 두 계통에서 저온 스트레스에 반응하는 전사체 발현 비교 분석

Comparative Transcriptome Analysis of the Response of Two Lines of Rapeseed (Brassica napus L.) to Cold Stress

  • 이지은 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 김광수 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 차영록 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 안다희 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 변종원 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 강용구 (농촌진흥청 국립식량과학원 바이오에너지작물연구소)
  • Lee, Ji-Eun (Bioenergy Crop Research Institute, National Institute of Crop Science, RDA) ;
  • Kim, Kwang-Soo (Bioenergy Crop Research Institute, National Institute of Crop Science, RDA) ;
  • Cha, Young-Lok (Bioenergy Crop Research Institute, National Institute of Crop Science, RDA) ;
  • An, Da-Hee (Bioenergy Crop Research Institute, National Institute of Crop Science, RDA) ;
  • Byun, Jong-Won (Bioenergy Crop Research Institute, National Institute of Crop Science, RDA) ;
  • Kang, Yong-Ku (Bioenergy Crop Research Institute, National Institute of Crop Science, RDA)
  • 투고 : 2020.11.25
  • 심사 : 2021.02.03
  • 발행 : 2021.03.01
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초록

본 연구에서는 유채 두 계통에 0℃ 이하의 저온 스트레스를 처리하고 이에 따른 proline 함량 및 생존율 변화를 확인하고 이에 따른 저온에서의 유전자 발현 변화를 비교 분석하기 위해 수행되었으며, 결과는 다음과 같다. 1. 0℃ 이하의 저온 스트레스 처리 전 저온 순화 후 유채 'J8634-B-30' 계통에서 proline 함량이 2.02 mM/g FW로 증가하여 처리 전보다 8.7배 증가하였으며, 'EMS26' 계통에서는 0℃ 이하의 저온 스트레스 처리로 인한 proline 함량 변화를 보이지 않았다. 2. 저온 순화 전후 유채 두 계통의 전사체를 분석한 결과, 'J8634-B-30' 계통의 DEG는 발현이 유도된 DEG가 2,784개로, 발현이 억제된 DEG 2,299개보다 많았으며, 'EMS 26' 계통에서는 발현이 유도된 DEG가 2,199개로 발현이 억제된 DEG 3,632개로 적었다. 3. 저온 스트레스 처리에 의한 유채 두 계통의 상위 100개 DEG를 분석한 결과, 'J8634-B-30' 계통에서는 flowering-promoting factor (BnaA10g21640D) 유전자가 강하게 발현되었으며, 특히 proline 생합성 관련 유전자의 발현이 강하게 유도되었다. 'EMS26' 계통의 DEG에서는 식물체 생장과 관련된 유전자가 발현이 억제되었다. 4. 'J8634-B-30' 계통에서는 proline 생합성 관련 P5CSA(BnaA04g22810D, BnaC04g46630D) 유전자의 발현이 유도되었으며, proline 이화작용 관련 PDH (BnaAnng 37880D, BnaC04g31100D) 유전자 발현이 억제되어, 저온 처리에 의한 proline 함량 이 증가한 것으로 판단된다. 5. 저온 반응 관련 생리반응 경로 유전자 중 ABA 호르몬 수용체 PYL5 (BnaAnng40650D), PYL9 (BnaA07g38130D, BnaC06g17940D)는 'J8634-B-30' 계통에서만 발현이 유도되었다. 또한, ICE-CBF-COR 신호 회로 중 원형질막 안정화에 관여하는 COR413 유전자(BnaA08g15470D, BnaC03g61740D)에서도 'J8634-B-30' 계통에서만 발현이 유도되었다. 6. 이러한 저온 스트레스 반응과 관련된 유전자 발현 차이는 초기 저온 처리 후 두 유채 계통의 스트레스 반응에 관여했을 것으로 판단되며, 특이적인 발현 양상을 보인 유전자에 대해 향후 추가적인 기능을 분석하여 내동성 유채 품종 개발에 활용할 수 있을 것으로 판단된다.

Rapeseed is a typical winter crop, and its freezing stress tolerance is a major feature for winter survival. Therefore, it is important to comprehend clearly the physical and molecular mechanisms of rapeseed under freezing stress conditions. This study investigates the physical and transcriptome changes of two rapeseed lines, 'J8634-B-30' and 'EMS26', under cold acclimation and freezing temperature treatments. The proline content of 'J8634-B-30' at 5 ℃ increased 8.7-fold compared to that before treatment, and there was no significant change in that of 'EMS26' RNA-sequencing analysis revealed 5,083 differentially expressed genes (DEGs) of 'J8634-B-30' under cold acclimation condition. Among the genes, 2,784 (54.8%) were up-regulated and 2,299 (45.2%) were down-regulated. The DEGs of 'EMS26' under cold acclimation condition were 5,831 genes, and contained 2,199 up-regulated genes (37.7%) and 3,632 down-regulated genes (62.3%). Among them, only DEGs annotated in the cold response-related signaling pathways were selected, and their expression in the two rapeseed lines was compared. Comparative DEGs analysis indicated that cold response related signaling pathways are proline metabolism and ABA (Abscisic acid) signaling. And ICE (Inducer of CBF expression) - CBF (C-repeat-binding factor) - COR (Cold-regulated) signaling were the significantly differentially expressed transcripts in the two rapeseed lines. The major induced transcripts of 'J8634-B-30' induced P5CS (Δ'-pyrroline-5-carboxylate synthetase), which is related to proline biosynthesis, PYL (pyrabactin resistance-like protein, ABA receptor) and COR413 (cold-regulated 413 plasma membrane 1). In conclusion, these result provide a foundation for understanding the mechanisms of freezing stress tolerance in rapeseeds. Further functional studies should be performed on the freezing stress-related genes identified in this study, which can contribute to the transgenic and molecular breeding for freezing stress tolerance in rapeseed.

키워드

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