The genetic location of the self-incompatibility locus in white clover (Trifolium repens L.) |
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Authors: | Nora M Casey Dan Milbourne Susanne Barth Melanie Febrer Glyn Jenkins Michael T Abberton Charlotte Jones Daniel Thorogood |
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Institution: | (1) Teagasc Crops Research Centre, Oak Park, County Carlow, Ireland;(2) Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Penglais, Aberystwyth, Ceredigion, Wales, SY23 3DA, UK;(3) Present address: John Innes Centre, Norwich Research Park, Colney, Norwich, NR4 7UH, UK; |
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Abstract: | White clover (Trifolium repens L.) is a forage legume of considerable economic importance in temperate agricultural systems. It has a strong self-incompatibility
system. The molecular basis of self-incompatibility in T. repens is unknown, but it is under the control of a single locus, which is expressed gametophytically. To locate the self-incompatibility
locus (S locus) in T. repens, we carried out cross-pollination experiments in an F1 mapping population and constructed a genetic linkage map using amplified fragment length polymorphism and simple sequence
repeat markers. As the first step in a map-based cloning strategy, we locate for the first time the S locus in T. repens on a genetic linkage map, on the homoeologous linkage group pair 1 (E), which is broadly syntenic to Medicago truncatula L. chromosome 1. On the basis of this syntenic relationship, the possibility that the S locus may or may not possess an S-RNase gene is discussed. |
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