Most significant genome regions involved in the control of earliness traits in bread wheat, as revealed by QTL meta-analysis
- 877 Downloads
Earliness is one of the most important adaptation traits in plant breeding. Our purpose was to identify the genome regions of bread wheat involved in the control of earliness and its three components: photoperiod sensitivity (PS), vernalization requirement (VR) and intrinsic earliness (IE). A QTL meta-analysis was carried out to examine the replicability of QTL across 13 independent studies and to propose meta-QTL (MQTL). Initial QTL were projected on a recent consensus map (2004). Quality criteria were proposed to assess the reliability of this projection. These criteria were based on the distances between markers in the QTL regions. Chromosomes of groups 2 and 5 had a greater incidence on earliness control as they carry the known, major genes Ppd and Vrn. Other chromosome regions played an intermediate role in earliness control: 4A [heading date (HD) Meta-QTL], 4B (HD MQTL), 2B (VR MQTL) and 5B (IE MQTL). Markers at this four MQTL should prove helpful in marker-assisted selection, to better control earliness.
KeywordsCommon Marker Head Date Photoperiod Sensitivity Vernalization Requirement Earliness Trait
We would like to thank M. Bernard and M. R. Perretant from the INRA Centre in Clermont-Ferrand, France, for kindly supplying data on the heading date and genotyping of the Eurêka × Renan population and genotyping data on Apache × Ornicar population, respectively. We are particularly grateful to A. J. Worland of JIC, Norwich, UK, and his team for generously supplying Mercia × Mercia (Ciano 67–2D) seeds. G. Charmet, INRA, Clermont-Ferrand and M. Rousset, INRA, Le Moulon, as well as the reviewers, are also thanked for their valuable comments and suggestions concerning this work.
- Glass GV (1976) Primary, secondary and meta-analysis of research. Educ Res 5:3–8Google Scholar
- Hanocq E, Sayers EJ, Niarquin M, Le Gouis J, Charmet G, Gervais L, Dedryver F, Duranton N, Marty N, Dufour P, Rousset M, Worland AJ (2003) A QTL analysis for earliness under field and controlled conditions in a bread wheat doubled-haploid population. In: Proceedings of the 12th EWAC conference, UK, p 57Google Scholar
- Law CN, Worland AJ, Giorgi B (1976) The genetic control of ear-emergence time by chromosome 5A and 5D of wheat. Heredity 36:49–58Google Scholar
- Law CN, Sutka J, Worland AJ (1978) A genetic study of day-length response in wheat. Heredity 41:185–191Google Scholar
- Maystrenko OI (1980) Cytogenetic study of the growth habit and ear emergence time on chromosome 2B of wheat. In: Proceedings of the 14th international congress of genetics, vol 1, pp 267–282Google Scholar
- Schlegel R (1996) A compendium of reciprocal translocations in wheat. Wheat Inf Serv 83:35–46Google Scholar
- Stelmakh AF (1990) Geographic distribution of Vrn genes in landraces and improved varieties of spring bread wheat. Euphytica 45:113–118Google Scholar
- Welsh JR, Keim DL, Pirasteh B, Richards RD (1973) Genetic control of photoperiod response in wheat. In: Proceedings of the 4th international wheat genetics symposium, Missouri, pp 879–884Google Scholar