Cowpea [Vigna unguiculata (L.)] is one of the most important arid legumes cultivated for pulse and forage production. Drought is one of the most damageable constraints to crop production impacting negatively food security. The potential of cowpea to address food security is well established. However, not much is known about the base index selection method in breeding cowpea for drought tolerance, which is important for yields. Consequently, the present study has been conducted to: 1) evaluate the yield performance of cowpea genotypes under artificial drought and well-watered condition, 2) ranke genotype performance using selection indices, and 3) assess relationship between agronomic traits and yield. The experiment was the 2 watering conditions laid out in a Randomized Complete Block Design (RCBD) with three replications. The experiment was carried out in pots under screen house at the Department of Horticulture at KNUST. The result showed that KPR1-96-73, Simbo, CZ06-4-16, Wilibaly and Agyenkwa were high yielding in well-water condition while Ghana Shoba, Sangaraka, Nketewade, Ghana Shoni and Korobalen were high yielding genotypes in water stress condition. The average yield reduction was 60.6% and 16% for grain and fodder yield respectively. The biplot displays revealed four groups among the genotypes tested which were based on their yielding capacity and drought tolerance. In cluster B high yielding and drought tolerant genotypes were identified, high yielding and drought susceptible have been identified in cluster A, low yielding and drought tolerant in cluster D, and lastly low yielding and drought susceptible in cluster C. Genotypes in cluster B were best due to the fact that it combines high yield and tolerance to drought. They were Ghana Shoni, Nketewade, Sangaraka and Ghana Shoba. These genotypes might be suitably employed in further drought tolerance breeding programs of cowpea. Significant relationships were observed between agronomic trait and yields under drought condition.
References
[1]
Agbicodo, E.M., Fatokun, C.A., Muranaka, S., Visser, R.G.F. and Linden van der, C.G. (2009) Breeding Drought Tolerant Cowpea: Constraints, Accomplishments, and Future Prospects. Euphytica, 167, 353-370. https://doi.org/10.1007/s10681-009-9893-8
[2]
Bressani, R. (1985) Nutritive Value of Cowpea. In: Singh, S.R. and Rachie, K.O., Eds., Cowpea Research, Production, and Utilization, John Wiley & Sons, Chichester, 353-360.
[3]
Singh, B.B. and Tarawali, S.A. (1997) Cowpea and Its Improvement: Key to Sustainable Mixed Crop/Livestock Farming Systems in West Africa. Crop Residues in Sustainable Mixed Crop/Livestock Farming Systems.
[4]
FAOSTAT (2012) Food and Agricultural Organization.
[5]
ICRISAT (2012) Cowpea Farming in Ghana. Bulletin of Tropical Legumes.
[6]
Egbadzor, K.F., Yeboah, M., Offei, S.K., Ofori, K. and Danquah, E.Y. (2013) Farmers’ Key Production Constraints and Traits Desired in Cowpea in Ghana. Journal of Agricultural Extension and Rural Development, 5, 14-20.
[7]
Ajeigbe, H.A., Oseni, T.O. and Singh, B.B. (2006) Effect of Planting Pattern, Crop Variety and Insecticide on the Productivity of Cowpea-Cereal Systems in Northern Guinea Savanna of Nigeria. Journal of Food Agriculture and Environment, 4, 145-150.
[8]
Bahar, B. and Yildirim, M. (2010) Heat and Drought Resistances Criteria in Spring Bread Wheat: Drought Resistance Parameters. Scientific Research and Assays, 5, 1742-1745.
[9]
Alidu, M., Atokple, I. and Akromah, R. (2013) Genetic Analysis of Vegetative Stage Drought Tolerance in Cowpea. Greener Journal of Agricultural Sciences, 3, 481-496. https://doi.org/10.15580/GJAS.2013.3.030613516
[10]
Mwale, S., Ochwo-Ssemakula, M., Sadik, K., Achola, E., Okul, V., Gibson, P., Edema, R., Singini, W. and Rubaihayo, P. (2017) Response of Cowpea Genotypes to Drought Stress in Uganda. American Journal of Plant Sciences, 8, 720-733. https://doi.org/10.4236/ajps.2017.84050
[11]
Hall, A.E. (2012) Phenotyping Cowpea for Adaptation to Drought. Frontiers in Physiology, 3, Article 155. https://doi.org/10.3389/fphys.2012.00155
[12]
Singh, B.B. and Matsui, T. (2002) Cowpea Varieties for Drought Tolerance. In: Fatokun, C.A., Tarawali, S.A., Singh, B.B., Kormawa, P.M. and Tamò, M., Eds., Challenges and Opportunities for Enhancing Sustainable Cowpea Production, International Institute of Tropical Agriculture (IITA), Ibadan, 278-286.
[13]
Batieno, B.J., Tignegre, J.-B., Hamadou, S., Hamadou, Z., Ouedraogo, T.J., Danquah, E. and Ofori, K. (2016) Field Assessment of Cowpea Genotypes for Drought Tolerance. International Journal of Sciences: Basic and Applied Research (IJSBAR), 30, 358-369. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/6623
[14]
Chiulele, R.M. (2010) Breeding Cowpea (Vigna unguiculata (L.) Walp.) for Improved Drought Tolerance in Mozambique. University of KwaZulu-Natal, Pietermaritzburg.
[15]
Richards, R.A. (2006) Physiological Traits Used in the Breeding of New Cultivars for Water-Scarce Environments. Agricultural Water Management, 80, 197-211. https://doi.org/10.1016/j.agwat.2005.07.013
[16]
Belko, N., Cisse, N., Diop, N.N., Zombre, G., Thiaw, S., Muranaka, S. and Ehlers, J.D. (2014) Selection for Postflowering Drought Resistance in Short- and Medium- Duration Cowpeas Using Stress Tolerance Indices. Crop Science, 54, 25-33. https://doi.org/10.2135/cropsci2012.12.0685
[17]
Bastos, E.A., do Nascimento, S.P., da Silva, E. M., Freire Filho, F.R. and Gomide, R.L. (2011) Identification of Cowpea Genotypes for Drought Tolerance. Revista Ciência Agronômica, 42, 100-107. https://doi.org/10.1590/S1806-66902011000100013
[18]
Chiulele, R.M., Mwangi, G., Tongoona, P., Ehlers, J.D. and Ndeve, A.D. (2011) Assessment of Cowpea Genotypes for Variability to Drought Tolerance. 10th African Crop Science Conference Proceedings, Maputo, 10-13 October 2011, 531-537.
[19]
de Lima Leite, M., Rodrigues, J.D. and das Virgens Filho, J.S. (2000) Efeitos do Déficit Hídrico Sobre a Cultura do Caupi, ev Emapa-821. III-Produção [Effects of Water Deficit on Cowpeas cv. EMAPA-821. III. Yield]. Revista de Agricultura (Piracicaba), 75, 9-20. https://doi.org/10.37856/bja.v75i1.1270
[20]
Nazari, L. and Pakniyat, H. (2010) Assessment of Drought Tolerance in Barley Genotypes. Journal of Applied Sciences, 10, 151-156. https://doi.org/10.3923/jas.2010.151.156
