Revista Ciência Agronômica
On-line version ISSN 1806-6690
BASTOS, Edson Alves et al. Identification of cowpea genotypes for drought tolerance. Rev. Ciênc. Agron. [online]. 2011, vol.42, n.1, pp.100-107. ISSN 1806-6690. http://dx.doi.org/10.1590/S1806-66902011000100013.
The genotypes selection for drought tolerance is very important for world food production, principally in arid regions or sites with irregular rain distribution. The objective of this work was to identify cowpea genotypes with drought tolerance and water stress sensitivity characteristics. Two experiments were carried out with 20 treatments and four replications, one under water deficit during reproductive phase and another one under full irrigation. The water deficit was obtained applying half the water depth required by cowpea. The leaf area index, chlorophyll content, grain components and grain yield were evaluated. The water deficit reduced 20% the leaf area index, 16% the chlorophyll content, 175% the pod number per plant and 60% the grain yield. The genotypes Santo Inácio and Tracuateua-192 present sensitivity to water deficit in soil andBRS-Paraguaçu, Pingo-de-ouro-1-2 and Pingo-de-ouro-2 show behavior for drought tolerance.
Keywords : Vigna unguiculata; Leaf area index; Chlorophyll content.