| Plant height(Ph) and spike length(Sl) are important agronomic traits to improve wheat yield.In order to further explore major and stable QTLs controlling Ph and Sl,QTL mapping and genetic analysis were performed on the F8 recombinant inbred lines(RIL population) developed by crossing a durum wheat Ailanmai(Triticum turgidum L.) and a wild emmer wheat LM001(T.turgidum ssp.dicoccoides) based on a genetic linkage map constructed by 55K SNP array in wheat,combined with the phenotype of Ph and Sl in eight environments over five years.The Ph and Sl showed continuous variation with approximately normal distribution,suggesting they were suitable for QTL analysis.A total of 24 QTLs were detected in the RIL population.Among them,seven QTLs controlling Ph were detected on chromosomes 2A,2B,4B,5A,6A and 7A,explaining 7.46%- 20.03% of phenotypic variation(PVE); 17 QTL controlling Sl were detected on chromosomes 2A,2B,3A,4A,4B,5A and 6B,explaining 6.52%-17.10% of PVE. QPh.sicau-AM-4B, QPh.sicau-AM-7A, QSl.sicau-AM-2B.2 and QSl.sicau-AM-4B.4 can be detected both in single and multi-environment analysis,suggesting that they were major and stable QTLs controlling Ph or Sl,explaining 9.17%-20.03%,10.44%-14.48%,10.41%-16.29% and 7.54%-11.70% of PVE,respectively.Moreover,QTL pyramiding indicated that the polymerization of QPh.sicau-AM-4B and QPh.sicau-AM-7A(controlling Ph) or QSl.sicau-AM-2B.2 and QSl.sicau-AM-4B.4(controlling Sl) significantly improved Ph or Sl,indicating the QTLs controlling Ph or Sl had an additive effect in the RIL population.That may be an important reason why there were many transgressive inheritances in offspring of RIL population. |
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