Assessment of genetic diversity in Nordic timothy (Phleum pratense L.)

Pirjo Tanhuanpää, Maria Erkkilä, Ruslan Kalendar, Alan Howard Schulman, Outi Manninen

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Background: Timothy (Phleum pratense L.), a cool-season hexaploid perennial, is the most important forage grass species in Nordic countries. Earlier analyses of genetic diversity in a collection of 96 genebank accessions of timothy with SSR markers demonstrated high levels of diversity but could not resolve population structure. Therefore, we examined a subset of 51 accessions with REMAP markers, which are based on retrotransposons, and compared the diversity results with those obtained with SSR markers. Results: Using four primer combinations, 533 REMAP markers were analyzed, compared with 464 polymorphic alleles in the 13 SSR loci previously. The average marker index, which describes information obtained per experiment (per primer combination or locus) was over six times higher with REMAPs. Most of the variation found was within accessions, with somewhat less, 89 %, for REMAPs, than for SSR, with 93 %. Conclusions: SSRs revealed differences in the level of diversity slightly better than REMAPs but neither marker type could reveal any clear clustering of accessions based on countries, vegetation zones, or different cultivar types. In our study, reliable evaluation of SSR allele dosages was not possible, so each allele had to be handled as a dominant marker. SSR and REMAP, which report from different mechanisms of generating genetic diversity and from different genomic regions, together indicate a lack of population structure. Taken together, this likely reflects the outcrossing and hexaploid nature of timothy rather than failures of either marker system.

Original languageEnglish
Article number5
JournalHereditas
Volume153
Issue number1
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • Genetic diversity
  • Genetic structure
  • Microsatellite
  • Phleum pratense L
  • REMAP
  • Retrotransposon marker
  • SSR
  • Timothy

ASJC Scopus subject areas

  • Genetics

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