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It has been repeatedly demonstrated that the centromere-specific histone H3 (CENH3), a key component of the centromere, shows considerable variability between species within taxa. We determined the molecular structure and phylogenetic relationships of CENH3 in 11  Secale  species and subspecies that possess distinct pollination systems and are adapted to a wide range of abiotic and biotic stresses. The rye ( Secale cereale ) genome encodes two paralogous  CENH3  genes, which differ in intron-exon structure and are transcribed into two main forms of the protein, αCENH3 and βCENH3. These two forms differ in size and amino acid substitutions. In contrast to the reported differences in CENH3 structure between species within other taxa, the main forms of this protein in  Secale  species and subspecies have a nearly identical structure except some nonsynonymous substitutions. The CENH3 proteins are strictly controlled by genetic factors responsible for purifying selection. A comparison between  Hordeum ,  Secale  and  Triticum  species demonstrates that the structure of CENH3 in the subtribes Hordeinae and Triticinae evolved at different rates. The assumption that reticulate evolution served as a factor stabilizing the structure and evolutionary rate of CENH3 and that this factor was more powerful within  Secale  and  Triticum  than in  Hordeum , is discussed.

Conserved molecular structure of the centromeric histone CENH3 in Secale and its phylogenetic relationships