Analysis of QTLs Related to Resistance to Brown Planthopper in Rice

DH 집단을 이용한 벼멸구 저항성 연관 QTLs 분석

  • Kim, Suk-Man (Department of Agronomy, Kyungpook National University) ;
  • Qin, Yang (Department of Agronomy, Kyungpook National University) ;
  • Sohn, Jae-Keun (Department of Agronomy, Kyungpook National University)
  • 김석만 (경북대학교 농업생명과학대학) ;
  • 친양 (경북대학교 농업생명과학대학) ;
  • 송재근 (경북대학교 농업생명과학대학)
  • Received : 2009.07.27
  • Published : 20090900

Abstract

This study was conducted to develop a japonica-type rice cultivar with brown planthopper (BPH) resistance using DNA markers. A doubled haploid (DH) population consisting of 120 pure-lines was established by anther culture of $F_1$ hybrids between 'Samgang', a Tongil type BPH resistance cultivar, and 'Nagdong', a japonica cultivar. To determine the map position of genes responsible for BPH resistance in rice, a genetic map was constructed based on 120 DH lines. A total of 162 molecular markers were classified into 12 linkage groups, covering 1,884 Kosami centimorgan (cM) with an average of 11.6 cM. Five QTLs (qBPR3, qBPR6, qBPR7, qBPR8, and qBPR12) associated with BPH resistance were identified and mapped on chromosomes 3, 6, 7, 8, and 12, respectively, using the genetic map constructed in this study. To analyze the relationship between BPH resistance and agronomic traits, a total of eight QTLs related to the agronomic traits were detected on 12 rice chromosomes. In an analysis of relationships, three QTLs (qBPR3, qBPR7, and qBPR8) showed a linkage with tested agronomic traits. A QTL (qBPR3) located on chromosome 3 (RM282-3023) was closely linked to culm length (qCL3). The QTL (qBPR8) for BPH resistance on the short arm of chromosome 8 also overlapped the region detected in culm length (qCL8).

벼멸구 저항성 유전자의 mapping, 벼멸구 저항성 관련 QTL 분석, 주요 농업형질과 벼멸구 저항성과의 관계 분석 등에 관한 연구를 수행 하여 얻은 결과는 다음과 같다. 벼멸구 저항성을 가진 통일형 벼인 '삼강'과 자포니카형 벼인 '낙동'을 교배하여 양성된 $F_1$의 약을 배양하여 육성된 120 DH 계통을 유전자 지도 작성을 위한 mapping 재료로 이용 하였다. Maker 검정에서 양친에 다양성을 나타낸 SSR 73, STS 89개 등 총 162개의 marker를 이용하여 전체 길이가 1,884 cM이고 평균 marker간 거리가 11.6 cM인 연관지도를 작성하였다. 유전자지도 작성에 이용된 120 DH 계통에 대한 벼멸구 저항성 정도를 조사하여 저항성 관련 QTL을 분석한 바, 3번, 6번, 7번, 8번 그리고 12번 염색체에서 1개씩 총 5개의 QTL을 확인하고 이들을 qBPR3, qBPR6, qBPR7, qBPR8, qBPR12로 명명하였다. 간장, 수장, 수수 및 출수일수에 대한 QTL을 분석하여, 총8개의 QTL이 7개의 염색체에 위치하는 것으로 확인되었다. 벼멸구 저항성과 주요 농업형질관련 QTL과의 연관관계를 분석한 바, 3번 염색체 상의 벼멸구 저항성 QTL(qBPR3)이 간장 및 수수 관련 QTL(qCL3, qNP6)과 연관되어 있었으며, 7번 염색체 상의 qBPR7은 분상질립 관련 QTL qPGC7.1과 qPWBP7.2과 그리고 8번 염색체상의 벼멸구 저항성 QTL 역시 간장관련 QTL(qCL8)과 연관되어 있는 것으로 나타났다.

Keywords

Acknowledgement

Supported by : 농촌진흥청

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