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Engenharia Agrícola • Rev. Caatinga 30 (4) • Oct-Dec 2017 • https://doi.org/10.1590/1983-21252017v30n421rc   copy

MORPHOPHYSIOLOGICAL RESPONSES OF COWPEA GENOTYPES TO IRRIGATION WATER SALINITY 1 Paper approved from IV CONAC 2016. Paper extracted from the master's thesis of the first author, supported by CAPES.

RESPOSTAS MORFOFISIOLÓGICAS DE GENÓTIPOS DE FEIJÃO-CAUPI À SALINIDADE DA ÁGUA DE IRRIGAÇÃO

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Cowpea is broadly cultivated worldwide, especially in semi-arid or arid regions where soil or irrigation water salt contents can negatively influence the species’ productive capacity. The objective of this study was to evaluate the morphophysiological responses of cowpea genotypes to irrigation water salinity. The experiment was conducted in a greenhouse, under a completely randomized design with nine replications and in a 5x3 factorial scheme. Treatments consisted of five levels of irrigation water electrical conductivity - EC (EC0: 0.55; EC1: 1.60; EC2: 3.20; EC3: 4.80 and EC4: 6.40 dS m-1), applied from the 15th day after sowing (DAS), and three cowpea genotypes (G1: BRS Imponente; G2: MNC04-795F-168 and G3: MNC04-795F-159). EC increases at 35 DAS promoted stem diameter reductions of 8.0% (G1), 11.4% (G2), and 7.7% (G3), indicating different resistance to salinity by each genotype. Leaf area reductions at 25 and 38 DAS were 30.9% and 38.8% for EC0 and EC4, respectively. The BRS Imponente cultivar presented a performance superior to those of G2 and G3 in relation to stem diameter and stem dry matter at 25 DAS, and root-shoot and root-leaf ratios at 38 DAS.

Keywords:
Vigna unguiculata; Saline stress; Plant growth.

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