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QTL analysis for cold tolerance at seedling stage using Hanareum2/Unkwang recombinant inbreeding lines in rice
한아름2호/운광 RIL 집단을 이용한 벼 내냉성 QTL 탐색
Korean J. Breed. Sci. 2017;49(4):334-343
Published online December 1, 2017
© 2017 Korean Society of Breeding Science.

Tae-Heon Kim1, Ji-Yoon Lee1, Su-Min Jo1, Jun-Hyun Cho1, Jong-Hee Lee2, You-Chun Song1, Dong-Soo Park1, Myung-Kyu Oh1, Dongjin Shin1*
김태헌1, 이지윤1, 조수민1, 조준현1, 이종희2, 송유천1, 박동수1, 오명규1, 신동진1*

1Department of Southern Area Crop Science, National Institute of Crop Science, RDA, Miryang, 50424, Korea,2Research Policy Bureau, RDA, Jeonju, 54875, Korea
1농촌진흥청 국립식량과학원 남부작물부, 2농촌진흥청 연구정책국
Abstract
Rice production is largely affected by various environmental conditions such as cold, heat and flooding. Here, to identify cold tolerant QTLs at seedling stage in rice, we generated RIL population derived from a cross between Hanareum 2 and Unkwang which are a highly cold sensitive and cold tolerant, respectively. We observed cold phenotype of this population in the growth chamber conditions and natural field conditions. For observation of cold tolerant phenotype of RIL population in the growth chamber, we treated cold stress (5~13°C) for 14 days and recovery for 4 days. When we examined the phenotype of RIL in the field conditions, temperature range in the field conditions was about 6 to 25°C in 2015~2016. We named QTLs as Seedling Cold Tolerant (SCT) in growth chamber and Cold induced Yellowing Tolerant (CYT) in the field, respectively. Three QTLs for SCT and 5 QTLs for CYT were detected on chromosome 1, 6, 7, 8, 10, 11 and 12. Among these QTLs, qSCT12 on chromosome 12 showed 26.3 LOD score with 25.5% of phenotypic variation. When qSCT11.1 and qSCT12 were combined, cold tolerant was most strongest in our experimental conditions. qCYT10 on chromosome 10 was identified in field experiment on both 2015 and 2016. These results may provide useful information for a marker-assisted breeding program to improve cold tolerance in rice.
Keywords : Rice, Quantitative trait loci, Cold tolerant, Marker-assisted selection


September 2018, 50 (3)
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