title: The genome composition of hexaploid Psammopyrum athericum and octoploid Psammopyrum pungens (Poaceae: Triticeae).
abstract: The genomic constitution of two species in the genus Psammopyrum, i.e., Ps. athericum (2n = 6x = 42) and Ps. pungens (2n = 8x = 56), was studied by genomic in situ hybridization (GISH). In Ps. athericum, one diploid chromosome set hybridized to a genomic probe from Pseudoroegneria ferganensis (St genome), one diploid set to a probe from Agropyron cristatum (P genome), and one diploid set to a probe from Thinopyrum junceiforme (EbEe genomes) or Th. bessarabicum (Eb genome). Substituting the St-genome probe with an L-genome probe from Festucopsis serpentinii resulted in exactly the same hybridization pattern, suggesting a genomic constitution of EStP or ELP for Ps. athericum. The same probes used on Ps. pungens showed two diploid sets of chromosomes hybridizing to the St-genome probe, one diploid set hybridizing to the P-genome probe, and one diploid set hybridizing to the EbEe-genome probe. The L-genome probe hybridized to approximately 14 of the chromosomes that were labeled by the St-genome probe. Hence the genomic constitution for Ps. pungens is proposed to be EStStP or EStLP.
authors.affiliation: Department of Crop Science, Swedish University of Agricultural Sciences, Box 44, SE-230 53 Alnarp, Sweden. pernilla.ellneskog@vv.slu.se
authors.forename: Pernilla
authors.initials: P
authors.lastname: Ellneskog-Staam
authors.forename: Björn
authors.initials: B
authors.lastname: Salomon
authors.forename: Roland
authors.initials: R
authors.lastname: von Bothmer
authors.forename: Kesara
authors.initials: K
authors.lastname: Anamthawat-Jónsson
mesh_terms: D031702:Agropyron / Q000235:genetics; D018745:Genome, Plant; D006109:Poaceae / Q000235:genetics*; D011123:Polyploidy