Theoretical and Applied Genetics

, Volume 104, Issue 6, pp 965-975

First online:

Comparative analysis of QTLs affecting domestication traits between two domesticated × wild pearl millet (Pennisetum glaucum L., Poaceae) crosses

  •  V. PoncetAffiliated withLaboratoire Evolution et Systématique, UPRESA 8079, bât. 362, Université Paris-Sud, 91405 Orsay Cedex, France
  • ,  E. MartelAffiliated withLaboratoire Evolution et Systématique, UPRESA 8079, bât. 362, Université Paris-Sud, 91405 Orsay Cedex, France
  • ,  S. AllouisAffiliated withJohn Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, UK
  • ,  K. DevosAffiliated withJohn Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, UK
  • ,  F. LamyAffiliated withLaboratoire Evolution et Systématique, UPRESA 8079, bât. 362, Université Paris-Sud, 91405 Orsay Cedex, France
  • ,  A. SarrAffiliated withLaboratoire Evolution et Systématique, UPRESA 8079, bât. 362, Université Paris-Sud, 91405 Orsay Cedex, France
  • ,  T. RobertAffiliated withLaboratoire Evolution et Systématique, UPRESA 8079, bât. 362, Université Paris-Sud, 91405 Orsay Cedex, France

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Abstract.

Comparative mapping of Quantitative trait loci (QTLs) involved in domestication of adaptative syndrome traits of pearl millet was realized at the intra-specific level using two F2 populations derived from domesticated (Pennisetum glaucum ssp. glaucum) × wild (Pennisetum glaucum ssp. monodii) crosses. The two domesticated parents analyzed differ in their geographical origins, agronomic characteristics and life cycles. In both populations, two regions of the genome were identified on linkage groups 6 and 7, that controlled most of the key morphological differences. The importance of these two linkage groups reveals their central role both in the developmental control of spikelet structure and in the domestication process of this crop. In contrast, QTLs involved in traits that are components of yield and measure differences in resource allocation (such as the shape of the spike, the number of spikes per plant and plant height) show a low level of correspondence among our two crosses. The results of the comparative mapping between cereals, although preliminary, reveal that genes involved in seed-shattering could correspond in maize, rice and sorghum. The evolutionary significance of our results, and especially the relationships between genome organization and cereal domestication, are discussed. The potential use of these results in pearl millet genetic-resources enhancement are presented.

Domestication Pennisetum glaucum Quantitative Trait Loci (QTL) Comparative mapping Wild relatives Cereals