Summary
Restriction fragment analysis of chloroplast (cp) DNAs from 35 wheat (Triticum) and Aegilops species, including their 42 accessions, was carried out with the use of 13 restriction enzymes to clarify variation in their cpDNAs. Fourteen fragment size mutations (deletions/insertions) and 33 recognition site changes were detected among 209 restriction sites sampled. Based on these results, the 42 accessions of wheat-Aegilops could be classified into 16 chloroplast genome types. Most polyploids and their related diploids showed identical restriction fragment patterns, indicating the conservatism of the chloroplast genome during speciation, and maternal lineages of most polyploids were disclosed. This classification of cpDNAs was principally in agreement with that of the plasma types assigned according to phenotypes arising from nucleus-cytoplasm interactions. These mutations detected by restriction fragment analysis were mapped on the physical map of common wheat cpDNA, which was constructed with 13 restriction endonucleases. Length mutations were more frequently observed in some regions than in others: in a 16.0 kilo base pairs (kbp) of DNA region, including rbcL and petA genes, 6 of 14 length mutations were concentrated. This indicates that hot spot regions exist for deletions/insertions in chloroplast genome. On the other hand, 33 recognition site mutations seemed to be distributed equally throughout the genome, except in the inverted repeat region where only one recognition site change was observed. Base substitution rate (p) of cpDNA was similar to that of other plants, such as Brassica, pea and Lycopersicon, showing constant base substitution rates among related taxa and slow evolution of cpDNA compared with animal mitochondrial DNA. Phylogenetic relationships among Triticum and Aegilops species were discussed, based on the present data.
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Communicated by G. Wenzel
Contributions no. 45 and no. 490 from the Kihara Institute for Biological Research, Yokohama City University and the Laboratory of Genetics, Faculty of Agriculture, Kyoto University, respectively.
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Ogihara, Y., Tsunewaki, K. Diversity and evolution of chloroplast DNA in Triticum and Aegilops as revealed by restriction fragment analysis. Theoret. Appl. Genetics 76, 321–332 (1988). https://doi.org/10.1007/BF00265331
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DOI: https://doi.org/10.1007/BF00265331