Acta Agriculturae Boreali-Sinica ›› 2023, Vol. 38 ›› Issue (5): 84-93. doi: 10.7668/hbnxb.20194275

Special Issue: Wheat Biotechnology

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

Major QTL Mapping and Candidate Gene Prediction of Spike Length in F2 Population of Wheat Keda 116 × Keda 101

GUO Yuan1,2, MA Zhihui1,2, WANG Shiyu1,2, NIU Zhipeng1,2, YANG Xiaoyu1,2, WEI Qing1,2, CHEN Anqi1,2, WANG Linsheng1,2   

  1. 1 College of Agriculture,Henan University of Science and Technology,Luoyang 471023,China
    2 Luoyang Key Laboratory of Crop Genetic Improvement and Germplasm Innovation,Luoyang 471023,China
  • Received:2023-05-22 Published:2023-10-28

Abstract:

Spike length is an important agronomic trait in wheat and is closely related to yield components.Studying wheat spike length genes and screening molecular markers linked to spike length genes can provide molecular support for wheat molecular marker-assisted breeding.The F2 population constructed with Keda 116 and Keda 101 as parents was used as test material to construct a genetic map covering the wheat genome by SSR molecular markers and to locate QTLs for spike length by combining the complete composite interval mapping method.A total of 434 pairs of primers with polymorphism between parents were screened from 3 234 pairs of primers,and the detection rate of polymorphic primers was 13.42%.A total of 28 molecular markers were screened for possible linkage to spike length by BSA mixed pool analysis,16 of these markers were verified to be tightly linked to the target gene by a population of 262 plants.The genetic map of wheat chromosome group was constructed by QTL-IciMapping software,and the average genetic distance between markers was 38.66 cM.A total of seven QTLs loci associated with spike length were detected,which were located on chromosomes 3B,4A,4B and 6B.The additive effect values of all the seven QTLs were positive and their contributions to the genetic variation of phenotypic traits ranged from 4.01% to 23.16%.Two major QTLs were mapped on chromosome 4B,explaining 17.59%-23.16% of the phenotypic variance.Among them,Qsl4B-2 was the most closely linked QTL locus with only 3.5 cM away from the nearest molecular marker,and the analysis found that it might be a new major QTL locus.Therefore,genes associated with spike length might exist on chromosome 4B.Within the marker interval of chromosome 4B from yzu397456 to yzu404917 and yzu409422 to yzu405167,there might be seven candidate genes regulating wheat spike length,which were consistently highly expressed in the spike.

Key words: Wheat, F2 population, Spike length, QTL, Candidate gene

Cite this article

GUO Yuan, MA Zhihui, WANG Shiyu, NIU Zhipeng, YANG Xiaoyu, WEI Qing, CHEN Anqi, WANG Linsheng. Major QTL Mapping and Candidate Gene Prediction of Spike Length in F2 Population of Wheat Keda 116 × Keda 101[J]. Acta Agriculturae Boreali-Sinica, 2023, 38(5): 84-93. doi: 10.7668/hbnxb.20194275.

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