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Phylogenetic and evolutionary relationships between Elymus humidus and other Elymus species based on sequencing of non-coding regions of cpDNA and AFLP of nuclear DNA

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Abstract

Species of the genus Elymus are closely related to some important cereal crops and may thus serve as potential alien genetic resources for the improvement of these crops. E. humidus is indigenous to Japan and is well adapted to a humid climate. However, the phylogenetic and evolutionary relationships between E. humidus and other Elymus species are unclear. To elucidate these relationships, we examined the sequences of three non-coding regions of chloroplast DNA (cpDNA) and the amplified fragment length polymorphism (AFLP) variation of nuclear DNA in E. humidus and other related species. A total of 15 sequence mutations from the three non-coding regions, trnL-trnF, trnF-ndhJ(C), and atpB-rbcL, covering approximately 1,800 bp, were detected in the Elymus species. A phylogenic tree resulting from the cpDNA sequence data revealed that all the species containing the St nuclear genome (St, StH, StY, and StHY) formed a well-supported clade that is remote from the Hordeum species (H). This result strongly supports the finding that Pseudoroegneria is the maternal genome donor to the genus Elymus. In addition, E. humidus showed the closest relationship with the cpDNA genome of the Pseudoroegneria species. The AFLP analysis detected 281 polymorphic bands with 11 AFLP primer combinations. The AFLP result showed that E. humidus is relatively closer to E. tsukushiensis. However, the cpDNA sequencing results indicated that E. humidus and E. tsukushiensis have different cytoplasmic origins. Our results suggest that the evolutionary process between E. humidus and E. tsukushiensis is not monophyletic, although the two species have similar morphological characters and adaptability.

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Acknowledgements

We thank Dr. Richard R.C. Wang (USDA-ARS, Forage and Range Research Laboratory, Utah State University, USA), Professor R. von Bothmer (Department of Plant Breeding, The Swedish University of Agricultural Sciences, Sweden), and Dr. N. Watanabe for (Faculty of Agriculture, Gifu University, Japan) for providing plant materials. Thanks are also due to Dr. H. Tsunematsu (Japan International Research Center for Agriculture Sciences, Japan) for his many useful comments on this manuscript.

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  1. Biological Resources Division, Japan International Research Center for Agriculture Sciences (JIRCAS), 1-1 Ohwashi, Tsukuba, 305-8686, Ibaraki , Japan

    D. H. Xu & T. Ban

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  1. D. H. Xu
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  2. T. Ban
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Correspondence to T. Ban.

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Communicated by J. Dvorak

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Xu, D.H., Ban, T. Phylogenetic and evolutionary relationships between Elymus humidus and other Elymus species based on sequencing of non-coding regions of cpDNA and AFLP of nuclear DNA. Theor Appl Genet 108, 1443–1448 (2004). https://doi.org/10.1007/s00122-004-1588-x

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