A Gene Encoding a DUF247 Domain Protein Cosegregates with the S Self-Incompatibility Locus in Perennial Ryegrass

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  • Chloe Manzanares, Forage Crop Genetics, Institute of Agricultural Sciences, ETH, Zurich, Ukendt
  • Susanne Barth, Teagasc Crops, Environment and Land Use Programme, Oak Park Research Centre, Irland
  • Daniel Thorogood, Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Storbritannien
  • Stephen Byrne, Danmark
  • Steven Yates, Forage Crop Genetics, Institute of Agricultural Sciences, ETH Zürich, Schweiz
  • Adrian Czaban, Danmark
  • Torben Asp
  • Bicheng Yang, BGI-Shenzhen, Building 1, Beishan Industrial Zone, Yantian District, Shenzhen, Kina
  • Bruno Studer, Forage Crop Genetics, Institute of Agricultural Sciences, ETH Zurich, Schweiz
The grass family (Poaceae), the fourth largest family of flowering plants, encompasses the most economically important cereal, forage, and energy crops, and exhibits a unique gametophytic self-incompatibility (SI) mechanism that is controlled by at least two multiallelic and independent loci, S and Z. Despite intense research efforts over the last six decades, the genes underlying S and Z remain uncharacterized. Here, we report a fine-mapping approach to identify the male component of the S-locus in perennial ryegrass (Lolium perenne L.) and provide multiple evidence that a domain of unknown function 247 (DUF247) gene is involved in its determination. Using a total of 10,177 individuals from seven different mapping populations segregating for S, we narrowed the S-locus to a genomic region containing eight genes, the closest recombinant marker mapping at a distance of 0.016 cM. Of the eight genes cosegregating with the S-locus, a highly polymorphic gene encoding for a protein containing a DUF247 was fully predictive of known S-locus genotypes at the amino acid level in the seven mapping populations. Strikingly, this gene showed a frameshift mutation in self-compatible darnel (Lolium temulentum L.), whereas all of the self-incompatible species of the Festuca–Lolium complex were predicted to encode functional proteins. Our results represent a major step forward toward understanding the gametophytic SI system in one of the most important plant families and will enable the identification of additional components interacting with the S-locus.
TidsskriftMolecular Biology and Evolution
Sider (fra-til)870-884
Antal sider15
StatusUdgivet - 2016

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