Original Paper

Theoretical and Applied Genetics

, Volume 111, Issue 4, pp 795-803

Linkage map construction in allotetraploid creeping bentgrass (Agrostis stolonifera L.)

  • N. ChakrabortyAffiliated withDepartment of Plant Pathology, University of Wisconsin
  • , J. BaeAffiliated withDepartment of Plant Pathology, University of Wisconsin
  • , S. WarnkeAffiliated withUSDA–ARS US National Arboretum
  • , T. ChangAffiliated withDepartment of Plant Pathology, University of Wisconsin
  • , G. JungAffiliated withDepartment of Plant Pathology, University of Wisconsin Email author 

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Abstract

Creeping bentgrass (Agrostis stolonifera L.) is one of the most adapted bentgrass species for use on golf course fairways and putting greens because of its high tolerance to low mowing height. It is a highly outcrossing allotetraploid species (2n=4x=28, A2 and A3 subgenomes). The first linkage map in this species is reported herein, and it was constructed based on a population derived from a cross between two heterozygous clones using 169 RAPD, 180 AFLP, and 39 heterologous cereal and 36 homologous bentgrass cDNA RFLP markers. The linkage map consists of 424 mapped loci covering 1,110 cM in 14 linkage groups, of which seven pairs of homoeologous chromosomes were identified based on duplicated loci. The numbering of all seven linkage groups in the bentgrass map was assigned according to common markers mapped on syntenous chromosomes of ryegrass and wheat. The number of markers linked in coupling and repulsion phase was in a 1:1 ratio, indicating disomic inheritance. This supports a strict allotetraploid inheritance in creeping bentgrass, as suggested by previous work based on chromosomal pairing and isozymes. This linkage map will assist in the tagging and eventually in marker-assisted breeding of economically important quantitative traits like disease resistance to dollar spot (Sclerotinia homoeocarpa F.T. Bennett) and brown patch (Rhizoctonia solani Kuhn).

Keywords

Agrostis stolonifera L. Creeping bentgrass Allotetraploid Linkage map Homoeologous chromosomes Molecular markers