Data/hora: 05/06/2024 10:11:46

Biblioteca(s): | Embrapa Amazônia Ocidental.
Data corrente: | 15/01/2020
Data da última atualização: | 22/04/2021
Autoria: | LOPES, M. T. G.; VIEIRA, M. L. C.; LOPES, R.; BRUNELLI, K. R.; MATIELLO, R. R.; SILVA, H. P. da; CAMARGO, L. E. A.
Afiliação: | MARIA TERESA G. LOPES, UFAM; MARIA LÚCIA C. VIEIRA, Universidade de São Paulo; RICARDO LOPES, CPAA; KÁTIA REGIANE BRUNELLI, Universidade de São Paulo; RODRIGO R. MATIELLO, Universidade Estadual de Ponta Grossa; HERBERT P. DA SILVA, Universidade de São Paulo; LUIS EDUARDO A. CAMARGO, Universidade de São Paulo.
Título: | Progeny evaluation for resistance to Phaeosphaeria leaf spot intropical maize.
Ano de publicação: | 2011
Fonte/Imprenta: | Canadian Journal of Plant Pathology, v. 33, n. 1, p. 49-53, 2011.
DOI: | 10.1080/07060661.2010.534895
Idioma: | Inglês
Conteúdo: | Maize breeding programmes in Brazil and elsewhere seek reliable methods to identify genotypes resistant toPhaeosphaerialeafspot. The area under the disease progress curve (AUDPC) is an accurate method to evaluate the severity of foliar diseases. However, at leastthree data points are required to calculate the AUDPC, which is unfeasible when there are thousands of genotypes to be assessed. The aim ofthis work was to estimate the heritability of disease resistance, evaluate disease severity at different times using a nine-point scale incomparison to the AUDPC, and establish the most suitable phenological period for disease assessment. A repeated experiment was conductedin a 11×11 lattice experimental design with three replications. Disease assessments were carried out at flowering, 15 and 30 dayspost-anthesis for the parental lines DS95, DAS21, the F1generation and 118 F2:3progenies. Then, the AUDPC was obtained and resultscompared with the single-point evaluations used to calculate it. Individual and joint analyses of variance were conducted to obtain heritabiliyestimates. The assessments performed after the flowering stage gave higher estimates of heritability and correlation with AUDPC. Weconcluded that one assessment between the 15th and 30th day after flowering could provide enough information to distinguish maize genotypes for their resistance to Phaeosphaeria leaf spot under tropical conditions.
Palavras-Chave: | Disease resistance evaluation.
Thesagro: | Doença de Planta.
Categoria do assunto: | --
Registro original: | Embrapa Amazônia Ocidental (CPAA)
Exemplares: | CPAA - (37846-1) - UPC - AP - DD -  -  -  - DIS