Effects of cowpea mild mottle virus on soybean cultivars in Brazil

Made available in DSpace on 2020-12-10T20:10:46Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-08-31 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) CortevaTM Agrisciences Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Soybean stem necrosis is caused by cowpea mild mottle virus (CPMMV), transmitted by the whitefly Bemisia tabaci. CPMMV has already been recorded in all major soybean-producing areas of Brazil. The impacts caused by CPMMV to the current Brazilian soybean production are unknown, thus the main objective of this study was to evaluate the effects of CPMMV infection on the main important soybean cultivars grown in the Southern and Midwestern regions of Brazil. Although asymptomatic in some of the tested cultivars, CPMMV infection significantly reduced the plant height, the number of pods per plant and the 1,000-grain weight. In addition, estimated yield losses ranged from 174 to 638 kg h(-1), depending on the cultivar. Evidence of seed transmission of CPMMV was observed in the BMX POTENCIA RR cultivar. These results suggest that CPMMV could have an important role in the reduction of soybean productivity in Brazil, but symptomless infections might be hiding the actual impact of this pathogen in commercial fields and infected seeds could be the primary inoculum source of the virus in the field. Univ Estadual Paulista Julio de Mesquita Filho UN, Dept Plant Protect, Botucatu, SP, Brazil CortevaTM Agrisci, Mogi Mirim, SP, Brazil Fundacao Apoio Pesquisa Pesquisa Agr Mato Grosso, Rondonopolis, MG, Brazil Univ Estado Bahia UNEB, Dept Human Sci, Campus IX, Barreiras, BA, Brazil Inst Phytus, Dept Entomol, Santa Maria, RS, Brazil Univ Estadual Paulista Julio de Mesquita Filho UN, Dept Plant Protect, Botucatu, SP, Brazil CAPES: 001 FAPESP: 2017/21588-7