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. 2020 Mar;70(1):93-100.
doi: 10.1270/jsbbs.19028. Epub 2019 Dec 17.

Classification and systematics of the Fagopyrum species

Takanori Ohsako  1 , Chengyun Li  2
Affiliations

Classification and systematics of the Fagopyrum species

Takanori Ohsako et al. Breed Sci. 2020 Mar.

Abstract

Fagopyrum (Polygonaceae) is a small genus including less than 30 species, mostly endemic to southern China. The genus includes two cultivated species, common buckwheat F. esculentum and Tartary buckwheat F. tataricum. Fagopyrum is clearly distinguished from other genus in Polygonaceae by the central position of embryo in achene. The genus is divided into two major groups, namely the cymosum group and the urophyllum group, based on morphological characters and molecular systematics. In the last three decades the number of species in the genus has doubled by the discovery of new species by Japanese and Chinese groups. Most of them are revealed to be included in the urophyllum group based on morphological and molecular genetic analyses. Molecular systematic surveys have also detected inappropriate treatment of some non-Fagopyrum species as new species or combination in the genus.

Keywords: classification; delineation of Fagopyrum; intraspecific variation; molecular systematics; new species.

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Figures

Fig. 1.
Fig. 1.
Cotyledons of Fagopyrum species. (a) F. esculentum ssp. esculentum, (b) F. tataricum ssp. tataricum, (c) F. cymosum, (d) F. urophyllum, (e) F. callianthum, and (f) F. leptopodum.
Fig. 2.
Fig. 2.
Phylogenetic relationships among Fagopyrum species by building a consensus of the previous results of molecular systematic studies. Species without clear phylogenetic positions are not included.
Fig. 3.
Fig. 3.
Phylogenetic relationships among diploid and tetraploid accessions of F. cymosum, F. tataricum, and F. wenchuanense inferred by parsimony method based on nucleotide sequences of matK region of cpDNA (GenBank accession AB093071–AB093087 and JF829982).
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