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PLANT GENETIC RESOURCES

Selection of Cowpea Genotypes in Hydroponics, Pots, and Field for Drought Tolerance

^a Department of Botany, Abia State University, PMB 2000 Uturu, Nigeria
^b Centre d'Etude Régional pour l'Amélioration de l'Adaptation à la Sécheresse (CERAAS), BP 3320 Thies Escale, Thies, Sénégal
^c Laboratoire d'Agrotechnologies Végetales, Université Libres de Bruxelles

^* Corresponding author (chuks_ogbonnaya{at}yahoo.co.uk)

The evaluation of cowpea (Vigna unguiculata [L.] Walp.) for drought tolerance in the field is slow, laborious, and provides variable results. The objectives of the study were to assess the differences in the growth of cowpea genotypes in hydroponics, and to determine whether such differences could be associated with drought tolerance in pots and field. Four cowpea genotypes varying in drought tolerance were evaluated for differences in height, collar diameter, leaf area, shoot and root biomass, root-shoot ratio, and root volume in hydroponics. On the basis of these results, selection of cowpea for vigorous growth under well-watered conditions could be conducted by means of hydroponics; however, rapid selection of cowpea for drought tolerance could not be made by this technique.

Abbreviations: , osmotic potential • LRWC, leaf relative water content • AET, Actual evapotranspiration • MET, maximum evapotranspiration • WUE, water use efficiency • I_s, stress index • G_s, stomatal conductance • RSR, root-shoot ratio • LAI, leaf area index

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