Selection of alfalfa genotypes for resistance to the foliar pathogen Curvularia geniculata
| Autor: | Gerarda Beatriz Pinto da Silva, Mariana Rockenbach de Ávila, Tamyris Nunes, Carolina Bremm, José Antônio Martinelli, Miguel Dall'Agnol |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
forage legumes Genotype Forage lucerne Biology 01 natural sciences Pasture Invasive species Persistence (computer science) Dry weight Doença de planta Ascomycota invasive plants Medicago sativa Selection Genetic lcsh:Science Leguminosa forrageira geography Fungo Multidisciplinary geography.geographical_feature_category food and beverages 04 agricultural and veterinary sciences Alfafa Spore foliar pathogen Productivity (ecology) Agronomy 040103 agronomy & agriculture 0401 agriculture forestry and fisheries lcsh:Q Seasons Brazil 010606 plant biology & botany |
| Zdroj: | Anais da Academia Brasileira de Ciências, Iss 0 (2017) Anais da Academia Brasileira de Ciências v.89 n.3 2017 Anais da Academia Brasileira de Ciências Academia Brasileira de Ciências (ABC) instacron:ABC Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS Anais da Academia Brasileira de Ciências, Volume: 89, Issue: 3, Pages: 1801-1813, Published: 17 AUG 2017 |
| ISSN: | 1678-2690 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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