Acta Agriculturae Boreali-Sinica ›› 2024, Vol. 39 ›› Issue (6): 94-105. doi: 10.7668/hbnxb.20195009

Special Issue: Biotechnology

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

Mapping QTLs Conferring Seed Yield Per Spike and Spike Axis Dry Weight in Castor

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

  1. College of Coastal Agricultural Sciences,Guangdong Ocean University,Zhanjiang 524088,China
  • Received:2024-03-23 Published:2024-12-28

Abstract:

The seed yield per spike and spike axis dry weight affect yield per plant.In order to reveal the genetic basis,QTLs were mapped with populations F2 and BC1 (F1×P2) derived from the cross combination 9048×16-201 using CIM and ICIM-ADD methods.A total of 7/10 (CIM/ICIM-ADD) QTLs were detected in the F2 population,including 3/6,3/3 and 1/1 QTLs conferring PSSY,PSADW and PBSADW respectively,with a contribution rate of 15.81%/24.09%,2.84%/8.65% and 6.49%/6.56%,respectively.And 1/3 QTLs were identified in the BC1 population,including 0/2 and 1/1 QTLs underlying PSSY and PBSADW,with a contribution rate of 0/10.28% and 11.60%/10.22% respectively.Among all the detected QTLs,qPSSY3.1 and qPBSADW3.1 were stable QTLs,and the latter was also the main-effect QTL,with contribution rates ranging from 3.76%—7.00% and 6.49%—11.60%,respectively.They overlapped in the marker interval RCM920—RCM950,forming a QTL cluster (i.e.,QTL-cluster4).Additionally,a dozen pairs of epistatic QTLs were detected with the epistatic effect of these traits accounting for more than 19% of the total contribution rate,indicating that the epistatic effect was an important genetic component of seed yield per spike and spike axis dry weight in castor.The results not only provided a reference for the understanding of the genetic structure of seed yield per spike and spike axis dry weight but also offered available molecular markers for marker-assisted selection.

Key words: Castor, Seed yield per spike, Spike axis dry weight, QTL mapping, Main-effect QTL

Cite this article

LIN Haihong, LU Jiannong, YIN Xuegui, HUANG Guanrong, ZHANG Liuqin, ZHANG Xiaoxiao, LIU Chaoyu, ZUO Jinying. Mapping QTLs Conferring Seed Yield Per Spike and Spike Axis Dry Weight in Castor[J]. Acta Agriculturae Boreali-Sinica, 2024, 39(6): 94-105. doi: 10.7668/hbnxb.20195009.

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