Genetic Effect of Sterile Spikelet Number-related QTL-qSsnps-5D and Its Use in Wheat Varieties
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1.School of Agriculture,Ludong University/Key Laboratory of Molecular Module-Based Breeding of High Yield and Abiotic Resistant Plants in Universities of Shandong;2.Modern Breeding Technology Center,Liaocheng Academy of Agricultural Sciences,Shandong Liaocheng;3.Shandong Agricultural Technology Extension Center

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Shandong Provincial Key Research and Development Program(2019GNC106126),National Natural Science Foundation of China(31871612),Youth Innovation Science and Technology Program of Colleges and Universities in Shandong Province (2019KJF002),Yantai Science and Technology Planning Project(2020XCZX045)

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    Abstract:

    qSsnps-5D,derived from the backbone parental line Jing 411(J411),is a major stable QTL for sterile spikelet number per spike(SSNPS). This study aimed to decipher the genetic effect of this QTL and its use in wheat varieties. Two populations,including a recombinant inbred lines derived from the cross of Kenong 9204(KN9204)and Jing 411(KJ-RIL),and a natural mapping population comprised by 314 wheat authorized varieties or advanced lines,were involved. The experiment results showed that qSsnps-5D was confirmed in an interval of 3.41 Mb from 0.72 Mb to 4.13 Mb on chromosome 5D among 8 datasets. Excellent allele of qSsnps5D from J411 could increase spikes per plant but significantly decrease thousand kernel weight in both KJ-RIL and the natural mapping populations. However,the genetic effects of qSsnps-5D on kernel number per spike and yield per plant were differing between the two populations. Two close linkage markers of qSsnps-5D,i.e.,AX110565536 and AX-86170796 were used to specify the breeding utilization characteristics of qSsnps-5D in the natural mapping population. The excellent haplotype for qSsnps-5D(Hap-GG-CC)was often found(80.60%) in the foreign varieties. Among the Chinese varieties,higher rates of excellent haplotype(Hap-GG-CC)were found from varieties of Qinghai province,Sichuan province and Henan province,but the rates of haplotype HapGG-CC were lower in varieties of Shandong,Beijing,Shaanxi and Hebei. The rates of Hap-GG-CC in varieties released from 1980 s to present were constantly declined. To facilitate the application of qSsnps-5D in future molecular breeding programs,we developed a PCR-based InDel molecular marker named as 5D-1620921. Altogether,this study provided insights for the application of qSsnps-5D in molecular breeding programs of wheat.

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History
  • Received:December 03,2021
  • Revised:December 13,2021
  • Adopted:December 21,2021
  • Online: May 10,2022
  • Published:
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