Relationships of Vigna unguiculata (L.) Walp., V. vexillata (L.) A. Rich. and species of section Vigna based on isozyme variation |
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Authors: | Gabriella Sonnante Angela R Piergiovanni Quat N Ng Pietro Perrino |
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Institution: | (1) Germplasm Institute, CNR, Via Amendola, 165/A, 70126 Bari, Italy;(2) International Institute of Tropical Agriculture, Oyo Road, PMB 5320 Ibadan, Nigeria |
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Abstract: | Summary Isozyme variation in 25 accessions of wild and cultivated Vigna unguiculata, 49 accessions of seven wild species belonging to section Vigna, and 11 accessions of V. vexillata (subgenus Plectrotropis) was scored at 17 putative loci to assess genetic relationships within and among species. The wild species selected for this study are among those which carry important agronomical traits useful in cowpea (V. unguiculata) breeding programs. Allelic frequencies were calculated and Nei's genetic distances were obtained. Low levels of intraspecific variation were observed for V. heterophylla, V. luteola and V. racemosa, whereas the other species showed a higher polymorphism. Vigna unguiculata possessed intraspecific genetic distances comparable to those previously found by other authors. Most of the isozyme variation was apportioned among species. Although V. luteola and V. marina had an interspecific genetic distance resembling the range observed at intraspecific level, all the other species showed very high interspecific distances. Vigna unguiculata was relatively closer genetically to V. vexillata than to the species belonging to section Vigna.Abbreviations AUS
Australia
- BDI
Burundi
- BRA
Brazil
- BWA
Botswana
- CAF
Central African Republic
- GHA
Ghana
- CMR
Cameroon
- COG
Congo
- RI
Costa Rica
- EGY
Egypt
- ETE
Ethiopia
- GAB
Gabon
- GRC
Greece
- ITA
Italy
- KEN
Kenya
- MOZ
Mozambique
- NER
Niger
- NGA
Nigeria
- PAN
Panama
- RWA
Rwanda
- TCD
Chad
- TZA
Tanzania
- ZAF
South Africa
- ZAR
Zaire
- ZMB
Zambia |
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Keywords: | cowpea isozyme Nei's genetic distance relationship variation Vigna species |
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