PEANUT SMUT DISEASE: PERFORMANCE OF Arachis hypogaea L. GENOTYPES

BIANCONI G, ROSSO M, ROSSI E, RUIZ M, ODDINO C, BONAMICO N. ; SOAVE S, ODDINO C

Merlo

Congreso; XXXV Reunión Científica Anual; 2017

Sociedad de biología de Cuyo

Peanut smut caused by Thecaphora frezii is a fungal and monocyclic disease in peanut crops (Arachis hypogaea L.). Cultural and chemical controls are suggested to reduce initial inoculum, without constituting the definitive disease management. Genetic resistance emerges as an alternative tool to decrease the intensity of the disease. The objective of this study was to describe the performance of a collection of peanut genotypes against the disease. The collection constituted by 211 genotypes, owned by Criadero El Carmen, was evaluated in the area of General Cabrera, Córdoba, during the agriculture season 2015/16. The measured characters were mean fruit number in 200 grams (FN) and mean node number (NN). For each genotype were estimated: disease incidence (INC), disease mean severity index in total fruits (SIT), disease mean severity index in affected fruits (SIA) and disease severity index (DSI). A multivariate approach, principal component analysis, was used to describe the relationship between genotypes, characters and between genotypes and characters. The first components of the biplot graph explained 86% of the variation. In this study were observed positive correlations