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Severity Evaluation Methods in Common Bean Recurrent Selection Programme for Resistance to Angular Leaf Spot
Author(s) -
Rezende Breno A.,
Abreu Ângela de Fátima B.,
Ramalho Magno Antonio P.,
Souza Elaine A.
Publication year - 2014
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/jph.12238
Subject(s) - biology , leaf spot , selection (genetic algorithm) , horticulture , plant disease resistance , fungal pathogen , pathogen , resistance (ecology) , rating scale , agronomy , botany , veterinary medicine , statistics , mathematics , gene , microbiology and biotechnology , medicine , computer science , artificial intelligence , biochemistry
The objectives of this study were to identify which method and period of evaluation of angular leaf spot ( ALS ) of common bean, caused by the fungal pathogen Pseudocercospora griseola , allow better discrimination among common bean lines derived from seven cycles of recurrent selection for resistance to this pathogen. For that reason, 35 lines of the first seven cycles of the programme were assessed for disease severity on leaves and pods using a rating scale. For leaves, the methods used were severity in field plots ( SF ), severity in sampled leaflets ( SS ) and percentage of the sampled leaf area with symptoms (% LAS ). Leaf assessments were performed at 7, 14, 21, 28, 33 and 41 days after flowering ( DAF ), and area under the disease progress curve ( AUDPC ) was calculated. On pods, severity was evaluated at 41 DAF . It was observed that the SF using a rating scale is the most efficient method for selection of resistant lines, and the best time period for evaluating the disease is around 33 DAF .