Acta Agriculturae Boreali-Sinica ›› 2022, Vol. 37 ›› Issue (1): 50-57. doi: 10.7668/hbnxb.20192749

Special Issue: Rice Biotechnology

• Crop Genetics & Breeding·Germplasm Resources·Biotechnology • Previous Articles     Next Articles

QTL Analysis of Rice Cold Tolerance at Germination and Bud Stage Utilizing Indica-Japonica RIL Population

CHEN Ziqi, WANG Weiping, ZHAO Hongqiang, WANG Hao, HAN Xiao, YANG Luomiao, XIN Wei, LIU Hualong, ZHENG Hongliang, WANG Jingguo   

  1. Key Laboratory of Germplasm Enhancement,Physiology and Ecology of Food Crops in Cold Region, Ministry of Education,Northeast Agricultural University,Harbin 150030,China
  • Received:2021-11-01 Published:2022-02-28

Abstract:

To map QTLs that control cold tolerance at germination and bud stages,to explore the genetic mechanism,a recombinant inbred line(RIL)population was used as experimental material.The RIL population contained 189 lines derived from the cross between Caidao,a japonica rice variety that had strong cold tolerance and was adopted as the female parent,and WD,a indica rice variety that had weak cold tolerance and was used as the male parent.The QTLs that control cold tolerance at germination and bud stage were mapped between four phenotypic indexes and 978 Bin markers by IciMapping 4.2.The four phenotypic indexes included relative germination rate,average germination days,seedling rate and cold tolerance level.The results showed that two pairs of epistatic QTLs related to cold tolerance at bud stage were mapped.The LOD scores were 5.70 and 5.55 and the phenotypic contribution rates were 13.22% and 39.87%,respectively.In addition,five and five QTLs that were related to cold tolerance at germination and bud stage were mapped,respectively.These QTLs were located on chromosomes 1,3,5 and 8.The LOD score and phenotypic contribution rate of these QTLs ranged from 2.55 to 7.07 and from 6.41% to 17.17%,respectively.qLTG3 had the highest phenotypic contribution rate among the five germination stage QTLs and was also related to cold tolerance at germination stage.qCTP1-2 had the maximum of phenotypic contribution rate among the five bud stage QTLs.qCTB1,qCTP1-2 and qLTG8 had not been reported.The QTLs and epistatic QTLs detected will provide a reference for the genetic research and improvement of cold tolerance in rice.

Key words: Rice, Germination stage, Bud stage, Cold tolerance, QTL

Cite this article

CHEN Ziqi, WANG Weiping, ZHAO Hongqiang, WANG Hao, HAN Xiao, YANG Luomiao, XIN Wei, LIU Hualong, ZHENG Hongliang, WANG Jingguo. QTL Analysis of Rice Cold Tolerance at Germination and Bud Stage Utilizing Indica-Japonica RIL Population[J]. Acta Agriculturae Boreali-Sinica, 2022, 37(1): 50-57. doi: 10.7668/hbnxb.20192749.

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