자포니카 벼의 담수발아 내성에 대한 QTL 분석

• 영문명: QTL Analysis for Tolerance to Anaerobic Germination in Japonica Rice (Oryza Sativa L.)
• 발행기관: 한국육종학회
• 저자명: 김진희(Jinhee Kim) 모영준(Youngjun Mo) 하수경(Su-Kyung Ha) 김우재(Woo-Jae Kim) 김보경(Bo-Kyeong Kim) 정지(웅Ji-Ung Jeung) 정종민(Jong-Min Jeong)
• 간행물 정보: 『한국육종학회지』Vol.51 No.4, 415~423쪽, 전체 9쪽
• 주제분류: 농수해양 > 기타농수해양
• 파일형태: PDF
• 발행일자: 2019.11.30

영문 초록

Hypoxia caused by water seeding of rice inhibits germination and often leads to serious problems in seedling establishment and early growth. To solve this problem, it is necessary to develop rice cultivars that can stably germinate and grow under anaerobic environments. In this study, we performed QTL analysis on anaerobic germination (AG) tolerance using 139 recombinant inbred lines (RILs) derived from a cross between Milyang23 and Gihobyeo, and identified two QTLs (qAG2.1, qAG2.2) on chromosome 2. The LOD scores at qAG2.1 and qAG2.2 were 3.30 and 5.31, respectively. The phenotypic variances explained by the QTLs were 9.19% and 14.99%, respectively. The japonica cultivar Gihobyeo provided alleles for AG tolerance at both QTLs. While the chromosomal location of qAG2.2 overlapped with previously identified QTLs for AG tolerance, qAG2.1 was detected in a locus that has not been reported previously. The RILs carrying favorable type alleles for the AG tolerance at both QTLs (qAG2.1 + qAG2.2) expressed 41.0% survival rate under the AG condition, which was significantly higher than those of the RILs carrying single QTL, qAG2.1 (22.0%) or qAG2.2 (26.2%). As the favorable alleles for the two QTLs found in this study derived from the japonica cultivar Gihobyeo, it is expected that they would accompany less linkage drag such as shattering and lodging compared to those derived from indica or landraces. The result of this study would provide useful information for improving AG tolerance of japonica rice cultivars that can be used for water seeding cultivation.

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키워드

AG tolerance Quantitative trait locus Rice Direct seeding Abiotic stress