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JXB Advance Access published online on July 10, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erl026
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© 2006 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received January 25, 2006
Accepted April 13, 2006

RESEARCH PAPER

Dissecting a wheat QTL for yield present in a range of environments: from the QTL to candidate genes

S. A. Quarrie 1 * *, S. Pekic Quarrie 2, R. Radosevic 2, D. Rancic 2, A. Kaminska 3, J. D. Barnes 3, M. Leverington 4, C. Ceoloni 5, and D. Dodig 6

1 Kraljice Natalije 39, 11000 Belgrade, Serbia
2 Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Belgrade-Zemun, Serbia
3 Environmental and Molecular Plant Physiology, IRES, School of Biology, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
4 John Innes Centre, Norwich Research Park, Colney Lane, Norwich NR4 7UH, UK
5 Department of Agrobiology and Agrochemistry, University of Tuscia, Via S. Camillo De Lellis, 01100 Viterbo, Italy
6 ARIS, Centre for Agricultural and Technological Research (CATR), Grljanski put bb, 19000 Zajecar, Serbia

* To whom correspondence should be addressed.
S. A. Quarrie, E-mail: quarrie{at}eunet.yu


  Abstract

Previous studies with 95 bread wheat doubled haploid lines (DHLs) from the cross Chinese Spring (CS)xSQ1 trialled over 24 yearxtreatmentxlocations identified major yield quantitative trait loci (QTLs) in homoeologous locations on 7AL and 7BL, expressed mainly under stressed and non-stressed conditions, respectively. SQ1 and CS contributed alleles increasing yield on 7AL and 7BL, respectively. The yield component most strongly associated with these QTLs was grains per ear. Additional results which focus on the 7AL yield QTL are presented here. Trials monitoring agronomic, morphological, physiological, and anatomical traits revealed that the 7AL yield QTL was not associated with differences in flowering time or plant height, but with significant differences in biomass at maturity and anthesis, biomass per tiller, and biomass during tillering. In some trials, flag leaf chlorophyll content and leaf width at tillering were also associated with the QTL. Thus, it is likely that the yield gene(s) on 7AL affects plant productivity. Near-isogenic lines (NILs) for the 7AL yield QTL with CS or SQ1 alleles in an SQ1 background showed the SQ1 allele to be associated with >20% higher yield per ear, significantly higher flag leaf chlorophyll content, and wider flag leaves. Epidermal cell width and distance between leaf vascular bundles did not differ significantly between NILs, so the yield-associated gene may influence the number of cell files across the leaf through effects on cell division. Interestingly, comparative mapping with rice identified AINTEGUMENTA and G-protein subunit genes affecting lateral cell division at locations homologous to the wheat 7AL yield QTL.

Keywords: AINTEGUMENTA; comparative genetics; G-protein {beta} subunit; gene function; wheat; yield components; yield QTL.

*Visiting Professor at the Schools of Biology and Agriculture, Food and Rural Development, Newcastle University, Newcastle NE1 7RU, UK.


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