Abstract
Mungbean (Vigna radiata (L.) Wilcz.) is an important leguminous crop cultivated mainly in Asia. Its wild relatives are considered useful genetic resources for mungbean breeding. However, the taxonomic history of mungbean and its wild relatives is complicated and some confusion is still present in recent publications. In this study, we examined the rDNA-ITS sequences and morphological characteristics of 83 gene bank accessions closely related to mungbean. As a result, we classified the 83 accessions into five species and one unclassified accession. The proper taxon name for each species was determined (Vigna grandiflora (Prain) Tateishi et Maxted, Vigna mungo (L.) Hepper, V. radiata, Vigna subramaniana (Babu ex Raizada) Raizada, and Vigna trinervia (Heyne ex Wight et Arn.) Tateishi et Maxted) based on a review of their taxonomic history and morphological comparisons between gene bank accessions and type specimens. A new taxonomic treatment is proposed and a morphological key has been prepared. In this treatment, Vigna radiata (L.) Wilcz. var. setulosa (Dalz.) Ohwi et Ohashi is treated as a synonym of Vigna radiata (L.) Wilcz. var. sublobata (Roxb.) Verdc., and Vigna hainiana Babu, Gopinathan et Sharma is a synonym of V. subramaniana. Accession ‘NI1135’ was revealed to be most closely related to, but is considerably differentiated from, mungbean (V. radiata) based on its rDNA-ITS sequences. It also has distinguishing morphological characters. Plants with similar morphologies and DNA profiles might be distributed in the Indian Himalaya. However, since only one accession is available at present, the taxonomic classification of ‘NI1135’ needs to be reconsidered in the future.
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Takahashi, Y., Muto, C., Iseki, K. et al. A new taxonomic treatment for some wild relatives of mungbean (Vigna radiata (L.) Wilcz.) based on their molecular phylogenetic relationships and morphological variations. Genet Resour Crop Evol 65, 1109–1121 (2018). https://doi.org/10.1007/s10722-017-0599-9
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DOI: https://doi.org/10.1007/s10722-017-0599-9