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Wild Vigna [Vigna grandiflora (Prain) Tateishi]

Explanations

Taxonomy
Vigna grandiflora is a twining wild species belonging to the subgenusCeratotropis in the genus Vigna . This taxon has been confused and identified as Phaseolus sublobatus var.grandiflorus or Phaseolus trinervius. Tateishi (1985) considered this taxon as distinct species and treated under the name V.grandiflora. 2n=22?.
Distribution
Myanmar, Thailand, Cambodia (Tateishi, 1985)
Characteristics
According to Tateishi(1985), the morphological characteristics of V.grandiflora is as follows. resembles V.radiata var.sublobata and V.trinervia.
Stems twining, rather densly clothed with long reddish brown hairs. Stipules peltate, lanceolate, acuminate at the apex, 13-15mm long, 3-5mm wide, pubescent with long spreading hairs. Leaflets chartaceous, hispid, terminal leaflets narrowly ovate to ovate, faintly to halfway 3-lobed. Bracteoles lanceolate, acuminate at the apex, 4.5-6mm long, 1-1.5mm wide.
Flowers golden yellow. Standard asymmetrical, 9-12mm long, 11-14mm wide. Keel-petals spirally incurved through 250-280 degree. Pocket on the left hand keel-petal about 3mm long. Pods spreading, linear, cylindrical, 5-8cm long, 4-5mm wide, 8-11 seeded.
Seeds ellipsoidal, somewhat laterally compressed, 3-3.8 x 2.7-3.3 x 2.1-2.7mm. Hilum linear, 2.3-2.7mm long,aril develops. Germination epgeal, primary leaf lanceolate without petiole.
As genetic resources
Tomooka et al.(1991) found a habitat of V.grandiflora at Phitsanulok province in Northern Thailand (treated as Species A in the original papaer). Using this accession, Egawa et al. (1991) successfully obtained vital F1 plants between V.radiata x V.grandiflora by means of enbryo resque technique. There are few or no genebanks that have the V.grandiflora accessions throughout the world. Therefore, collection and evaluation of this species is considered to be very important.
References
Egawa Y., N.Tomooka, C.Lairungreang, P.Nakeeraks and C.Thavarasook. 1991. The possibility to use V.mungo (Black gram) and V.grandiflora for Mungbean breeding. In "Mungbean and The Genetic Resources, The Subgenus Ceratotropis" 39-43. Tropical Agriculture Research Center, Japan.
Marechal,R., J.M.Mascherpa and F.Stainer. 1978. Etude taxonomique d'un groupe complexe d'speces des genres Phaseolus et Vigna (Papilionaceae) sur la base de donnees morphologiques et polliniques, traitees par l'analyse informatique. Boissiera 28 : 1-273.
Tateishi,Y. 1985. A revision of the Azuki bean group, the subgenus Ceratotropis of the genus Vigna (Leguminosae). Ph.D. Thesis, Tohoku University, Sendai, Japan.
Tomooka,N. 1991. Collection and evaluation of wild Ceratotropis species in Northern Thailand. In "Genetic Diversity and Landrace Differentiation of Mungbean, Vigna radiata (l.) Wilczek, and Evaluation of its Wild Relatives (The Subgenus Ceratotropis) as Breeding Materials" Techinical Bulletin of Tropical Agriculture Research Center. No.28. pp.39-46. MAFF, Japan.