Lesion size as a criterion for screening oat genotypes for resistance to leaf spot

In Brazil, increased leaf spot disease ( Pyrenophora chaetomioides Speg.) frequency and intensity on cultivated spring oat ( Avena sativa ) requires that plant pathologists and breeders rapidly identify oat genotypes with greater resistance. Criteria are needed to compare and evaluate oat genotypes...

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Published in:	European journal of plant pathology Vol. 134; no. 2; pp. 315 - 327
Main Authors:	da Silva, Márcia Ruff, Martinelli, José Antônio, Federizzi, Luiz Carlos, Chaves, Márcia Soares, Pacheco, Marcelo Teixeira
Format:	Journal Article
Language:	English
Published:	Dordrecht Springer Netherlands 01-10-2012 Springer Springer Nature B.V
Subjects:	Agriculture Avena sativa Biological and medical sciences Biomedical and Life Sciences Controlled conditions Crop diseases Ecology Fundamental and applied biological sciences. Psychology Genotype & phenotype Genotypes Leafspot Leaves Lesions Life Sciences Oats Phytopathology. Animal pests. Plant and forest protection Plant breeding Plant Pathology Plant resistance Plant Sciences Seedlings Resistance components Lesion expansion rate Ascomycota Avena sativa Monocotyledones Plant pathogen Genotype Cereal crop Fungi Resistance Gramineae Angiospermae Pyrenophora Pyrenophora chaetomioides Spermatophyta Lesion
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Summary:	In Brazil, increased leaf spot disease ( Pyrenophora chaetomioides Speg.) frequency and intensity on cultivated spring oat ( Avena sativa ) requires that plant pathologists and breeders rapidly identify oat genotypes with greater resistance. Criteria are needed to compare and evaluate oat genotypes to screen large numbers of lines, quantification of resistance components under controlled conditions allowing year-long screening and the rejection of susceptible lines before lengthy field trials. There is a need to determine which resistance components are associated with leaf spot intensity in the field, as estimated from the area under the disease progress curve (AUDPC). We assessed various oat P. chaetomioides resistance components under controlled conditions in seedlings of 26 oat genotypes chosen from recommended varieties and elite breeding lines to determine the association of resistance components with the AUDPC, obtained by evaluating each genotype in the field. The resistance components estimated were: initial lesion size (ILS) and final lesion size (FLS); rate of lesion expansion ( r ); and area under the normalized and corrected lesion expansion curve (AULECc). All correlations were positive and significant at p = 0.01 and were distributed into moderate (0.5 < r < 0.8) and strong (0.8 ≤ r < 1) correlation classes. The strongest average correlations occurred with the AULECc (0.827), ILS (0.801) and FLS (0.801) components. These results indicate which components may be useful in resistance screening, with FLS possibly being the most useful criterion because it is less laborious to obtain and speeds up the selection process for leaf spot resistance.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0929-1873 1573-8469
DOI:	10.1007/s10658-012-9991-7