-The objective of this work was to identify new sources of simple and multiple resistances to Cowpea severe mosaic virus (CPSMV), Cowpea aphid-borne mosaic virus (CABMV) and Cucumber mosaic virus (CMV) isolates in cowpea (Vigna unguiculata). Thirty-three genotypes from the germplasm bank of Universidade Federal do Ceará were tested as to their resistance to four CPSMV isolates, two CABMV isolates and one CMV isolate. Twenty-five days after the first virus inoculations, all inoculated plants, including the asymptomatic ones, were tested by serology. Genotypes were classified as: immune, plants without symptoms and negative serology; resistant, plants with mild mosaic and positive serology; susceptible, plants with mosaic and positive serology; and highly susceptible, plants with severe mosaic, other systemic symptoms, including systemic necrosis, and positive serology. Simple and multiple resistances to viruses were identified among the evaluated genotypes, but none of them showed multiple immunities to all isolates. Four genotypes showed immunity to all CPSMV isolates, two were immune to CABMV and two showed immunity to CMV. Eleven genotypes showed multiple resistances to two viruses, allowing for the development of new cultivars with more stable and broader resistance. Genotypes Purple Knuckle Hull-55, MNC-03-731C-21 and CNCx284-66E show resistance to CABMV, even when inoculated with CMV.Index terms: Cowpea aphid-borne mosaic virus, Cowpea severe mosaic virus, Cucumber mosaic virus, Vigna unguiculata, serology, virus control. Resistência simples e múltipla a vírus em genótipos de caupi Resumo -O objetivo deste trabalho foi identificar novas fontes de resistência simples e múltiplas em genótipos de feijoeiro caupi (Vigna unguiculata) a isolados de Cowpea severe mosaic virus (CPSMV), Cowpea aphid-borne mosaic virus (CABMV) and Cucumber mosaic virus (CMV). Trinta e três genótipos do Banco de Germoplasma daUniversidade Federal do Ceará foram classificados quanto a sua resistência a quatro isolados de CPSMV, dois de CABMV e um de CMV. Após 25 dias da primeira inoculação dos isolados, todas as plantas que sofreram inoculação, incluindo as assintomáticas, foram testadas por meio de sorologia. Os genótipos foram classificados como: imune, plantas assintomáticas e sorologia negativa; resistentes, plantas com mosaico leve e sorologia positiva; suscetível, plantas com mosaico e sorologia positiva; altamente suscetível, plantas com mosaico severo, outros sintomas sistêmicos, como necrose sistêmica, e sorologia positiva. Foram identificadas fontes de resistência simples e múltipla às viroses, nos genótipos avaliados; no entanto, nenhum deles apresentou imunidade múltipla aos três vírus. Quatro genótipos apresentaram imunidade aos isolados de CPSMV, dois aos isolados de CABMV e dois ao CMV. Onze genótipos apresentaram resistência múltipla a dois vírus, o que possibilita o desenvolvimento de novas cultivares com resistência mais abrangente e estável. Os genótipos Purple Knuckle Hull-55, MNC-03-731C-21 e CNCx284-66E m...
Cowpea is one of the most consumed annual legumes in the world, but, despite its economic importance, the crop has low productivity in the Northeast of Brazil, being related to the genotypes used, climatic factors, and soil quality. In this context, this study aimed to evaluate the physiological parameters of nine genotypes in different phenological stages, cultivated under rainfed conditions. The experiment was carried out in the area of cowpea multiplication, belonging to the Federal University of Ceará (UFC), using a completely randomized design in a 9x2 factorial scheme, referring to nine genotypes and two stages of development (vegetative and reproductive) with ten repetitions, totaling 90 experimental plots. The evaluation of gas exchange (photosynthesis, stomatal conductance, transpiration, Ci/Ca ratio, and water use efficiency) were performed in the vegetative and reproductive phases (30 and 60 days after sowing), using the infrared gas analyzer (IRGA). It was verified that the variables of photosynthesis, stomatal conductance, and transpiration presented higher values in the vegetative stage concerning the reproductive stage, standing out of genotypes CE693, CE701, and CE735. For variables, Ci/Ca ratio, and water use efficiency, the genotypes with the lowest mean values were CE390 and CE570. The genotypes CE693, CE701, and CE735, presented better stability in the physiological parameters in the two phenological stages, and this may favor the production of cowpea.
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