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2014 Vol.32, Issue 1 Preview Page
Characterization of a Cold Tolerance-related Gene, BrCSR, Derived from Brassica rapa

배추 유래 저온 저항성 관련 유전자, BrCSR의 특성 분석

Jae-Gyeong Yu1
,
Young-Doo Park1
유 재경1
,
박 영두1
1Department of Horticultural Biotechnology, Kyunghee University
1경희대학교 원예생명공학과
*교신저자. *Corresponding Author. 
28 February 2014. pp. 91-99
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Abstract

The objective of this study is to identify cold-tolerance genes in Brassica rapa. In order to acheive this goal, we analyzed a KBGP-24K oligo chip data [BrEMD (B. rapa EST and Microarray Database)] using B. rapa ssp. pekinensis inbred line ‘Chiifu’ under cold stress condition (4°C). Among 23,929 unigenes of B. rapa, 417 genes (1.7%) were primarily identified as cold responsive genes that were expressed over 5-fold higher than those of wild type control, and then a gene which has unknown function and has full length sequence was selected. It was named BrCSR (B. rapa Cold Stress Resistance). BrCSR was transformed using expression vector pSL101 to confirm whether BrCSR can enhance cold tolerance in tobacco plants. T1 transgenic tobacco plants expressing BrCSR were selected by PCR and Southern hybridization analyses, and the function of BrCSR was characterized by expression level analysis and phenotype observation under cold stress condition. The expression level of BrCSR in transgenic tobacco plants increased up to about two folds in quantitative real-time RT-PCR assay and this was very similar to Northern blot hybridization analysis. Analysis of phenotypic characteristics clearly elucidated that transgenic tobaccos expressing BrCSR were more cold tolerant than wild type control under 4°C treatment. Based on these results, we conclude that the over-expression of BrCSR might be closely related to the enhancement of cold tolerance.

Keywords
microarray
Northern blot hybridization
over-express
transgenic tobacco

본 연구는 배추에서의 저온 저항성 유전자를 개발하는데 목적이 있으며 이를 위해 먼저 저온(4°C) 스트레스가 처리된 내혼계배추를 대상으로 한 KBGP-24K oligo chip의 결과[BrEMD(Brassica rapa EST and Microarray Database)]를 분석하였다. 그 결과 23,929개의 배추 unigene 중 저온 처리 시 대조군 대비 5배 이상 발현이 증가하는 417개(1.7%)의 저온 반응 유전자를 1차 선발하고, 이들 중 기능이 정확히 알려지지 않았으나 완전장을 갖추고 있는 BrCSR로 명명한 유전자를 선발하였다. 이 유전자의 저온 저항성을 분석하기 위하여 형질전환용 과발현 vector인 pSL101 binary vector를 제작하여 담배에 형질전환시켰다. BrCSR이 과발현된 T1 세대 담배 형질전환체들은 PCR과 Southern hybridization 분석에 의해 선발하였고, BrCSR의 기능은 저온 처리 시 유전자의 발현 수준 분석과 표현형 검정을 통해 확인하였다. Quantitative real-time RT-PCR과 Northern blot hybridization 분석 결과, 형질전환 담배에서 BrCSR의 발현이 대조군보다 약 2배 정도 높게 발현되었으며 실제로 4°C 처리 후 표현형 분석에서 BrCSR이 과발현된 형질전환체들이 대조군보다 우수한 저온 저항성을 보여 주었다. 위 결과들에 근거하여 BrCSR 유전자가 저온 환경 하에서 식물의 생장과 저항성 향상에 중요한 역할을 담당하고 있음을 확인할 수 있었다.

키워드
마이크로어레이
노던 혼성화
과발현
형질전환 담배
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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :원예과학기술지
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 32
  • No :1
  • Pages :91-99
  • Received Date : 2013-02-14
  • Revised Date : 2013-06-17
  • DOI :https://doi.org/10.7235/hort.2014.13025
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