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Research article - Peer-reviewed, 2005

Structural and distributional variation of mitochondrial rps2 genes in the tribe Triticeae (Poaceae)

Kubo N, Salomon B, Komatsuda T, von Bothmer R, Kadowaki K


The mitochondrial rps2 gene from barley, like that of rice, wheat, and maize, has an extended open reading frame (ORF) at the 3'-region when compared to that from lower plants. However, the extended portions are variable among these cereals. Since barley and wheat belong to the same tribe (Triticeae), it would be interesting to know when and where the two types of rps2 were generated during evolution. To determine this, we utilized the mitochondrial (mt)DNA sequence to examine variations of the rps2 genes in the tribe Triticeae. By means of the variable 3'-region, the distribution of barley (B)-type and wheat (W)-type rps2 sequences was studied in 19 genera of the tribe. The B-type sequence was identified in 10 of the 19 genera, whereas the W-type sequence was present in all 19 genera. Thus, ten of the examined genera have both types of rps2 sequences due to the presence of two copies of the gene. The W-type sequence was also present in the tribe Bromeae and the B-type sequence was also found in Aveneae and Poeae. Phylogenetic trees based on the B-type and W-type sequences were different from those based on other molecular data. This suggests that the mitochondrial genome in Triticeae has a unique evolutionary history

Published in

TAG Theoretical and Applied Genetics
2005, Volume: 110, number: 6, pages: 995-1002
Publisher: SPRINGER

    SLU Authors

    • Salomon Dödsbo, Björn

      • Department of Crop Science, Swedish University of Agricultural Sciences
    • UKÄ Subject classification

      Agricultural Science
      Environmental Sciences related to Agriculture and Land-use

      Publication Identifiers


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