Electronic Journal of Plant Breeding (Jun 2010)
Relationship between moisture tolerance versus yield and yield components in Cowpea
Abstract
The experiment was carried out to exploit the broad spectra of genetic variability in cowpea germplasm for improvement ofhigh moisture tolerance. Twenty-five germplasm lines of diverse genteic background with three local cultivars were involvedin the evaluation over two cropping seasons (early and late) under rainfall conditions across two locations in 2006. Theexperiments were conducted in the Teaching and Research Farm, Ambrose Alli University, Ekpoma (Lat. 6o 08′ E and Long.6o 42′ N) in a rain forest–savanna transition area with mean annual rainfall of 1200mm to 1556mm; and at Benin–OwenaRiver Basin Development Authority, Obayantor, near Benin (Lat. 6o 09′ 24″and Long. 5o 35′ 27″ E) in the humid rainforestarea with mean annual rainfall of 2032mm to 2540mm. RCBD with three replications was used. Significant negativerelationship (r) existed between moisture tolerance and pods per plant, seeds per pod and grain yield which indicated that asseverity of moisture level in the soil increased with time, susceptibility level of the germplasm also increased with aconsequent reduction in the number of pods per plant, number of seeds per pod and grain yield. Seeds per pod and 100–seedweight were recognized as the common attributes for grain yield and selection be done based on these traits for improvementof cowpea for high moisture stress.
