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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (2): 270-278.doi: 10.3724/SP.J.1006.2009.00270

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS • Previous Articles     Next Articles

QTL Mapping for Grain Yield and Spike Related Traits in Common Wheat

ZHANG Kun-Pu1,2, XU Xian-Bin3,TIAN Ji-Chun1,*   

  1. 1State Key Laboratory of Crop Biology/Group of Quality Wheat Breeding, Shandong Agricultural University,Tai'an 271018,China;2Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101,China;3Dezhou Academy of Agricultural Sciences, Dezhou 253015,China
  • Received:2008-06-11 Revised:2008-09-03 Online:2009-02-12 Published:2008-12-11
  • Contact: TIAN Ji-Chun

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Abstract:

Grain yield and spike related traits are complex traits in wheat (Triticum aestivum L.). They are often influenced by environmental factors and show a high genotype-environment interaction. Thus, determination of the number, locations, effects of these polygenes is desired for obtaining optimal genotypes in breeding practice. To detect QTLs associated with wheat yield, such as grain yield, spike length, grains pe spike, spikelets per spike, compactness, fertile spikelets per spike, thousand-grain weight, and grain diameter a set of 168 doubled haploid (DH) lines derived from the cross between Huapei 3 and Yumai 57 were used with 305 SSR markers covering the whole wheat genome. The DH population and the parents were evaluated for grain yield and spike related traits in 2005 and 2006 cropping seasons in Tai’an, Shandong province and in 2006 cropping season in Suzhou, Anhui province. QTL analyses were performed using the software of QTLNetwork version 2.0 based on the mixed linear model. A total of 27 additive QTLs and 13 pairs of epistatic QTLs were detected for grain yield and spike related traits. Of these, eight additive QTLs had significant interactions with environments. Many of the traits shared the same QTL, which was consistent with its high phenotypic correlations and showed tight linkages or pleiotropisms. The Xwmc215–Xgdm63interval on chromosome 5D had the same direction of additive effects on grain yield, grains pr spike, spikelets per spike, compactness, and fertile spikelets per spike with high contribution, which showed pleiotropisms and could be used in marker-assisted selection. And the favorable alleles were contributed by Yumai 57. The QTLs for thousand-grain weight were located on different intervals from the QTLs for grains per spike, which was beneficial to genetic recombinant for them in wheat breeding programs.

Key words: Common wheat(Triticum aestivum L.), Grain yield, Marker-assisted selection, QTL mapping, Spike related trait

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