Bragantia (2012) 71, 59-66

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Cláudia Roberta Ribeiro de Oliveira, Francisco Rodrigues Freire Filho, Maria do Socorro da Rocha Nogueira, Gislanne Brito Barros, Marcelo Eiras, Valdenir Queiroz Ribeiro and Ângela Celis de Almeida Lopes (2012)
Reação de genótipos de feijão-caupi revela resistência às coinfecções pelo Cucumber mosaic virus, Cowpea aphid-borne mosaic virus e Cowpea severe mosaic virus
[Reaction of cowpea genotypes reveals resistance to co-infection by Cucumber mosaic virus, Cowpea aphid-borne mosaic virus and Cowpea severe mosaic virus]
Bragantia 71 (1), 59-66
Abstract: Many factors can affect the yield of cowpea, especially viruses. The main species of viruses infecting cowpea in Brazil are Cucumber mosaic virus (CMV), Cowpea aphid-borne mosaic virus (CABMV), Cowpea severe mosaic virus (CPSMV) and Cowpea golden mosaic virus (CPGMV). This study aimed to evaluate the reaction of cowpea genotypes for resistance to CMV in single or in co-infections (CMV+CABMV, CMV+CPSMV-I and CMV+CABMV+CPSMV-I), which was accomplished in two steps. Firstly, 57 genotypes were evaluated in four evaluations: three in aphid proof cages with infection under controlled conditions, and one in field-grown plants under natural infection. To perform the second step, we selected 18 genotypes to be conducted in nine trials, with eight under aphid proof cages control infection, and one under natural infection. The qualitative and quantitative effects resulting from infections were evaluated. In the field trial, we assessed the number of asymptomatic plants, pod length, number of grains per pod, 100-grain mass and yield. Mixed infections reduced the plant height and dry weight, and premature death of some genotypes was observed in infections involving the three viruses. The genotypes BR17-Gurguéia, Epace V-96, TE97-309G-9, TE97-309G-22, TE97-309G-24 and Patativa showed the best behavior in relation to the mixed viral infections, presenting seeds with appropriate commercial standard and with potential for using in breeding programs.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Marcelo Eiras

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Cucumber mosaic virus Cowpea and relatives (Vigna) Brazil (NE)
Cowpea aphid-borne mosaic virus Cowpea and relatives (Vigna) Brazil (NE)
Cowpea severe mosaic virus Cowpea and relatives (Vigna) Brazil (NE)