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      Emergência e vigor de plântulas de genótipos de feijão-caupi sob estresse salino Translated title: Emergence and seedling vigor of cowpea genotypes under salt stress

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          Abstract

          Objetivou-se, com este trabalho, avaliar o efeito da salinidade da água de irrigação no feijão-caupi e identificar genótipos tolerantes ao estresse salino nos estádios iniciais do seu desenvolvimento. Os níveis de condutividade elétrica da água foram: 0; 2,5; 5,0 e 7,5 dS m-1. A tolerância do feijão-caupi foi avaliada através da redução relativa de matéria seca da parte aérea de cada genótipo. Os resultados foram comparados e analisados pelo teste de Scott-Knott, a 0,05 de probabilidade. Todas as variáveis foram afetadas pelo aumento da salinidade da água de irrigação. O genótipo CE-182 mostrou-se mais tolerante nos níveis 2,5, 5,0 e 7,5 dS m-1 na água salinizada com solução de NaCl. No caso da solução salinizada pela mistura dos sais, os genótipos CE-9 e CE-551 foram mais tolerantes.

          Translated abstract

          The objective of this study was to evaluate the effect of salinity of irrigation water on cowpea and identify genotypes tolerant to salt stress in the eaR Ly stages of its development. The levels of electrical conductivity (EC) of irrigation water were 0, 2.5, 5.0 and 7.5 dS m-1. The tolerance of cowpea was evaluated by the relative reduction in shoot dry matter of each genotype. The results were compared and analyzed by Scott-Knott test at 0.05 level of probability. All variables were affected by increasing salinity of irrigation water. The genotype CE-182 was more tolerant at EC of 2.5, 5.0 and 7.5 dS m-1 of water salinized with NaCl. In the solution containing mixture of salts, the genotypes CE-9 and CE-551 were the most tolerant.

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          The effects of NaCl priming on salt tolerance in melon seedlings grown under saline conditions

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            Expansion of Bean Leaves and its Suppression by Salinity

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              Salt tolerance of cowpea genotypes in the emergence stage

              The effect of NaCl salinity (0, 85 and 170 mmol/L) during emergence of 25 genotypes of cowpea [Vigna unguiculata (L.) Walp.] was studied under growth chamber conditions. Seed emergence percentage and rate, root:shoot ratio, and biomass per plant were affected by genotype, salinity and genotype salinity interaction; this interaction showed that salinity effects differed among genotypes. The criterion used to classify genotypes with respect to their salt tolerance was based on their germination percentages in both 85 and 170 mmol NaCl/L. One genotype was grouped into class ‘A’ (CB27) which had the highest salt tolerance at emergence, and was classified as salt tolerant. Another group consisting of Paceño, CB88, CB3, CB5, Tardón, Cuarenteño and CB46 was placed into class ‘B’; these genotypes showed total emergence percentages up to 75% in both 85 and 170 mmol NaCl/L. A third group of genotypes was placed into class ‘C’ which had the lowest emergence percentages in both 85 and 170 mmol NaCl/L. It was confirmed that salinity treatments affect the emergence of cowpea, delaying both emergence percentage and rate. We conclude that selection and classification for salt tolerance in cowpea genotypes can be successfully undertaken at early seedling stages, because the same genotypes were classified similarly during the germination stage in previous research.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbeaa
                Revista Brasileira de Engenharia Agrícola e Ambiental
                Rev. bras. eng. agríc. ambient.
                Departamento de Engenharia Agrícola - UFCG (Campina Grande )
                1807-1929
                October 2012
                : 16
                : 10
                : 1047-1054
                Affiliations
                [1 ] Universidade Federal do Ceará Brazil
                [2 ] Universidade Federal do Ceará Brazil
                [3 ] Universidade Federal do Ceará Brazil
                [4 ] Universidade Federal do Ceará Brazil
                Article
                S1415-43662012001000003
                10.1590/S1415-43662012001000003
                9bac0aec-ad6c-469a-a545-15a232a195a7

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1415-4366&lng=en
                Categories
                AGRICULTURAL ENGINEERING
                ENVIRONMENTAL SCIENCES

                Agricultural engineering,General environmental science
                Vigna unguiculata,salinity,tolerance,salinidade,tolerância

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