Genome relationships in Thinopyrum junceum (L.) Löve polyploid complex

The genomic relationships between Thinopyrum bessarabicum 2n= 14, T. junceiforme 2« = 28, T. sartorii 2n =2B and T. junceum 2« = 42 were determined by computer-aided karyotype analysis. The results revealed that the genome of T. bessarabicum is similar to one of the two nearly identical genomes of J. junceiforme and the genome designations JJ,Jj‘ and jbjbjbjh are proposed for the two taxa respectively. The chromosome complement of T. junceiforme is found very similar to that of T. sartorii for which the genome designation J j1 J j1 J j3 J3 is advocated, while both taxa are characterized as segmental allotetraploids. Thinopyrum junceum is characterized as segmental allohexaploid with the genome designation Furthermore, the examined taxa of T. junceum polyploid complex are considered as separate biological species and it is suggested that they have modified versions of the same basic genome.