SCREENING COWPEA (Vigna unguiculata (L.) Walp.) GERMPLASMS FOR ADAPTATION TO DROUGHT IN THE SUDAN SAVANNA ZONE OF NIGERIA.
Keywords:Local checks; cowpea; drought escape; drought tolerance; drought avoidance.
Field trials were conducted at IITA research farm, Minjibir, Kano State, Nigeria during the 2016 and 2017 dry seasons to evaluate the growth and yield attributing characters of cowpea germplasms as influenced by genetic variations under drought imposed and also to determine genetic variations of drought response among the germplasms root system and related traits. The results revealed that, IT98K1092-2, IT97K-499-39, Tvu-11610 and Tvu-1000 were considered as drought escape (flowered and matured early) and with reasonable yield characters. Delayed in flowering were discovered on Aloka local, Dan’ila, and Tvu-10408. Following were found with enhanced levels of drought tolerance IT98K1092-2, Tvu-10408 and Tvu-10302. Susceptibility to drought was recorded on Tvu-1000, Tvu-11610 and IT97K-499-39. Among the genotypes, Ife-brown, Dan’ila, Tvu-1330, and Aloka local developed stay green character, widest root stem, long tap root and deep (steep) architectural root system and they were considered with drought avoidance. For the development of more drought tolerance, it could be recommended that, crossing genotypes with character of drought escape, drought tolerance and drought avoidance are the most promising trait for breeders to consider as potential parents in making crosses aimed at developing more drought populations.
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