Selection of alfalfa genotypes for resistance to the foliar pathogen Curvularia geniculata

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

Interacción entre hongos saprófitos del suelo y micorrizas vesículo-arbusculares

Fil: McAllister, Claudia Beatriz. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina

Anais...

Manejo conservacionista de solo em microbacias hidrográficas; Manejo de solo de cultivares e de equipamentos no sistema plantio direto; Manejo da fertilidade do solo no sistema plantio direto; Plantio direto em campo natural

Snap beans: Present status in the developing world and bibliography of research (1919-1987)

The present status of snap beans in the developing world is reviewed in the leading paper accompanying this publication. Socioeconomic aspects are mainly discussed. Production, marketing, and consumption features are described and the future potential for the crop is outlined. Constraints to production increases are discussed and the opportunities for research and development of the crop are defined. The bibliography contains 922 references to research on snap beans. Most of the documents (761) are available at CIAT. References are organized by disciplines and are complemented with author and subject indexes. The institutions identified by the Bean Information Center as carrying out research on snap beans are listed in the enclosed preliminary directory, which also includes the names of the snap bean researchers recorded in the CIAT database and the participants in the workshop on snap bean breeding held at CIAT in 1987. (CIAT)Se revisa la situacion actual de la habichuela en el mundo en desarrollo en el articulo principal que acompana esta bibliografia. Se discuten principalmente los aspectos socioeconomicos. Se describen los aspectos de produccion, mercadeo y consumo y se esboza el potencial futuro para el cultivo. Se discuten las limitaciones para el incremento de la produccion y se definen las oportunidades de investigacion y desarrollo del cultivo. La bibliografia contiene 922 referencias de investigacion sobre habichuela. La mayoria de los documentos (761) se encuentran disponibles en el CIAT. Las referencias estan organizadas por disciplinas y complementadas con indices de autores y materias. En el directorio preliminar adjunto se enumeran las instituciones identificadas por el Centro de Informacion sobre Frijol que estan realizando investigacion en habichuela. Tambien se incluyen los nombres de los investigadores de habichuela registrados en la base de datos del CIAT y los participantes en la reunion sobre mejoramiento de habichuela realizado en CIAT en 1987. (CIAT