| Journal: | Anais da Academia Brasileira de Ciencias |
| Database: | PERIÓDICA |
| System number: | 000412311 |
| ISSN: | 0001-3765 |
| Authors: | Avila, Mariana R1 Dall' Agnol, Miguel1 Martinelli, Jose A2 Silva, Gerarda B.P. da2 Bremm, Carolina3 Nunes, Tamyris1 |
| Institutions: | 1Universidade Federal do Rio Grande do Sul, Departamento de Plantas Forrageiras e Agrometeorologia, Porto Alegre, Rio Grande do Sul. Brasil 2Universidade Federal do Rio Grande do Sul, Departamento de Fitopatologia, Porto Alegre, Rio Grande do Sul. Brasil 3Fundacao Estadual de Pesquisa Agropecuaria, Porto Alegre, Rio Grande do Sul. Brasil |
| Year: | 2017 |
| Season: | Sep |
| Volumen: | 89 |
| Number: | 3 |
| Pages: | 1801-1814 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | Foliar diseases impose severe restrictions on the persistence and productivity of Medicago sativa, both of which may be increased by developing disease resistant and more competitive genotypes that can improve pasture quality. We found Curvularia geniculata as the principal alfalfa foliar pathogen in the Brazilian state of Rio Grande do Sul (RS). Growth chamber experiments evaluated the resistance of alfalfa genotypes ‘E1C4’, ‘CPPSul’, ‘ABT 805’ and ‘CUF-101’ to C. geniculata as compared the control ‘Crioula’ genotype. These genotypes were also evaluated in field trials at a sea level site in Eldorado do Sul in central RS and at two sites £200 m above sea level, one in Bagé municipality in south west RS and the other at a farm near the town of Alto Feliz in north east RS. Plants were spray-inoculated with 1.6 x 106 ml-1 of C. geniculata spores and visually evaluated for leaf damage 14 days later. The C. geniculata infection rates varied from zero to 100%. Alfalfa persistence and forage mean dry mass (DM) production at the Eldorado site were measured during different seasons from November 2013 to January 2015 by calculating the incidence of invasive plants and morphologically separating leaves from stems and calculating both leaf and stem DM. Data were analysed using mixed statistical models. The best results for persistence and forage DM were shown by the ‘CPPSul’ genotypes (DM = 16,600 kg ha-1) and ‘Crioula’ (DM = 15,750 kg ha-1). These two genotypes will be used for subsequent investigations and selection cycles |
| Disciplines: | Agrociencias |
| Keyword: | Fitopatología, Hongos, Angiospermas, Alfalfa, Variedades resistentes, Hongos fitopatógenos, Selección de genotipos, Medicago sativa, Curvularia geniculata |
| Keyword: | Agricultural sciences, Phytopathology, Fungi, Angiosperms, Alfalfa, Resistance, Phytopathogenic fungi, Genotype selection, Medicago sativa, Curvularia geniculata |
| Full text: | Texto completo (Ver HTML) |
