Plant Soil Environ., 2009, 55(4):139-145 | DOI: 10.17221/1615-PSE

Consequences of the water deficit on water relations and symbiosis in Vigna unguiculata cultivars

A.K.S. Lobato1, R.C.L. Costa2, C.F. Oliveira Neto2, B.G. Santos Filho2, M.C. Gonçalves-Vidigal1, P.S. Vidigal Filho1, C.R. Silva1, F.J.R. Cruz2, P.M.P. Carvalho2, P.C.M. Santos2, A. Gonela1
1 Núcleo de Pesquisa Aplicada a Agricultura, Universidade Estadual de Maringá, Maringá, Brazil
2 Laboratório de Fisiologia Vegetal Avançada, Universidade Federal Rural da Amazônia,

The study aimed at evaluating and comparing changes provoked by the water deficit on water relations and nitrogen fixation in two Vigna unguiculata cultivars, as well as at indicating which cultivar is more tolerant under water deficiency. The experimental design used was entirely randomized in factorial scheme, with 2 cultivars (Pitiuba and Pérola) and 2 water regimes (control and stress). The parameters evaluated were the leaf relative water content, stomatal conductance, transpiration rate, nodule number, nodule dry matter, nitrate reductase enzyme activity, ureide concentration and leghemoglobin in nodule. The stomatal conductance of the Pitiuba and Pérola cultivars under water deficit were 0.20 and 0.01 mmol H2O/m2/s, respectively. The nitrate reductase activity of the plants under stress was significantly reduced in both cultivars. The leghemoglobin in the Pitiuba and Pérola cultivars under water stress had the concentrations of 58 and 41 g/kg dry matter, respectively. The parameters investigated in this study suggest that the Pitiuba cultivar under water deficit suffers from smaller changes, when compared with Pérola cultivar.

Keywords: Vigna unguiculata (L.) Walp.; water deficit; stomatal conductance; nodulation; N2 fixation

Published: April 30, 2009  Show citation

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Lobato AKS, Costa RCL, Oliveira Neto CF, Santos Filho BG, Gonçalves-Vidigal MC, Vidigal Filho PS, et al.. Consequences of the water deficit on water relations and symbiosis in Vigna unguiculata cultivars. Plant Soil Environ. 2009;55(4):139-145. doi: 10.17221/1615-PSE.
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