Acta Agriculturae Boreali-Sinica ›› 2023, Vol. 38 ›› Issue (6): 36-44. doi: 10.7668/hbnxb.20194396

Special Issue: Biotechnology

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

QTL Mapping and Candidate Gene Identification of Effective Spike Number in Ricinus communis L.

HUANG Guanrong, YIN Xuegui, LU Jiannong, ZHANG Liuqin, LIU Chaoyu, ZHANG Xiaoxiao, LIN Haihong, ZUO Jinying   

  1. College of Coastal Agricultural Sciences,Guangdong Ocean University,Zhanjiang 524088,China
  • Received:2023-08-20 Published:2023-12-28

Abstract:

Effective spike number is an important component of castor yield.In order to reveal the genetic basis and mining candidate genes of effective spike number,the QTLs conferring effective spike number per plant(ESNPP)and number of effective primary branch spike(EPBSN)were mapped by genotyping with SSR primers and by the 2 detection methods(CIM and ICIM-ADD)in the populations F2 and BC1 (F1×P2)derived from 2 parents with significant phenotypic differences,and QTL remapping was conducted in S1 population by the same method.A total of 9/5(CIM/ICIM-ADD,the same below) QTLs were identified in the F2 population,including 3/2 and 6/3 underlying ESNPP and EPBSN,with a phenotypic variation explained(PVE)of 6.70%/11.87% and 25.15%/13.87%,respectively.The mapping results in BC1 population were generally consistent with those in F2 population.Among them, qESNPP3.1 and qEPBSN3.1 were stable QTLs with contribution rates close to 10%,and the latter was detected again in S1 population with a PVE of 13.27%;the stable QTLs were overlappingly located in the marker interval RCM915—RCM950,and together constituted a main-effect QTL cluster underlying the effective spike number.Two candidate genes,Rc-US03g04880 and Rc-US03g05950,were annotated from the marker interval,which were differentially expressed in multiple branching tissues of both parents.The above results provided essential molecular markers for marker-assisted selection of the effective spike number and necessary candidate genes for its genetic and physiologic mechanism study in castor.

Key words: Castor, Effective spike number, QTL mapping, Candidate gene, Main-effect QTL

Cite this article

HUANG Guanrong, YIN Xuegui, LU Jiannong, ZHANG Liuqin, LIU Chaoyu, ZHANG Xiaoxiao, LIN Haihong, ZUO Jinying. QTL Mapping and Candidate Gene Identification of Effective Spike Number in Ricinus communis L.[J]. Acta Agriculturae Boreali-Sinica, 2023, 38(6): 36-44. doi: 10.7668/hbnxb.20194396.

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