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      Ubiquity of the St chloroplast genome in St-containing Triticeae polyploids.

      1 , ,
      Genome

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          Abstract

          Interspecific hybridization occurs between Tritceae species in the grass family (Poaceae) giving rise to allopolyploid species. To examine bias in cytoplasmic DNA inheritance in these hybridizations, the sequence of the 3' end of the chloroplast ndhF gene was compared among 29 allopolyploid Triticeae species containing the St nuclear genome in combination with the H, I, Ns, P, W, Y, and Xm nuclear genomes. These ndhF sequences were also compared with those from diploid or allotetraploid Triticeae species having the H, I, Ns, P, W, St, and Xm genomes. The cpDNA sequences were highly similar among diploid, allotetraploid, allohexaploid, and allooctoploid Triticeae accessions containing the St nuclear genome, with 0-6-nucleotide (nt) substitutions (0-0.8%) occurring between pairs of species. Neighbor-joining analysis of the sequences showed that the ndhF DNA sequences from species containing the St nuclear genome formed a strongly supported clade. The data indicated a strong preference for cpDNA inheritance from the St nuclear genome-containing parent in hybridizations between Triticeae species. This preference was independent of the presence of the H, I, Ns, P, W, and Xm nuclear genomes, the geographic distribution of the species, and the mode of reproduction. The data suggests that hybridizations having the St-containing parent as the female may be more successful.

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          Author and article information

          Journal
          Genome
          Genome
          0831-2796
          0831-2796
          Oct 2000
          : 43
          : 5
          Affiliations
          [1 ] United States Department of Agriculture, Corn and Soybean Research and Department of Plant Pathology, Ohio Agriculture Research and Development Center, Ohio State University, Wooster 44691, USA. redinbaugh.2@osu.edu
          Article
          10.1139/g00-053
          11081975
          8304379c-505e-4a77-8973-fc4f944e74b7
          History

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