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Inheritance analysis of the S4/SHT fragment of linkage group #4 supports allopolyploid origin and reveals genome composition of a tetraploid (2n = 32) lineage of Fagopyrum homotropicum Ohnishi

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Abstract

A tetraploid lineage of Fagopyrum homotropicum carries four copies of the dominant gene SHT (seed-shattering habit). Two copies are tightly linked to the locus determining homostyly (as in diploid lineages of F. homotropicum); in contrast, two other copies are not linked with the homostyly gene (as in wild sub-species of common buckwheat Fagopyrum esculentum ssp. ancestrale). The results support the hypothesis, proposed by Ohnishi and Asano (1999), that tetraploid F. homotropicum has arisen through hybridization between diploid F. homotropicum and F. esculentum ssp. ancestrale followed by genome doubling. It is concluded that F. homotropicum is really a set of reproductively isolated species which may be crossed in experiments only; the species complex is a part of a wider complex which also includes outcrossing F. esculentum. We discuss why only cross-pollinating buckwheat of this complex has been domesticated.

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Acknowledgments

We are grateful to Dr. Clayton Campbell, Kade Research Ltd., Manitoba for kindly supplying seeds of the line H#4, and to Dr. Joel S. Shore (York University, Toronto) for helpful critical comments and correcting the manuscript. Also, we thank anonymous reviewer for his work to additionally improve our text.

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The authors declare that they have no conflict of interest.

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  1. All-Russia Research Institute of Grain Legumes and Groats Crops, 302502, Orel, Russia

    Nikolay N. Fesenko & Ivan N. Fesenko

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  1. Nikolay N. Fesenko
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  2. Ivan N. Fesenko
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Correspondence to Ivan N. Fesenko.

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Handling editor: Martin Lysak.

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Fesenko, N.N., Fesenko, I.N. Inheritance analysis of the S4/SHT fragment of linkage group #4 supports allopolyploid origin and reveals genome composition of a tetraploid (2n = 32) lineage of Fagopyrum homotropicum Ohnishi. Plant Syst Evol 301, 2141–2146 (2015). https://doi.org/10.1007/s00606-015-1217-y

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  • DOI: https://doi.org/10.1007/s00606-015-1217-y

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