Data/hora: 03/06/2024 16:22:37

Provedor de dados: | 63
País: | Brazil
Título: | Interaction between resistance to Septoria tritici and phenological stages in wheat
Autores: | Gieco,Jorge Omar; Dubcovsky,Jorge; Camargo,Luis Eduardo Aranha.
Data: | 2004-01-01
Ano: | 2004
Palavras-chave: | Mycosphaerella graminicola; Triticum aestivum; Leaf blotch; Disease resistance.
Resumo: | Studies dedicated to understanding the behavior of pathogens in relation to their hosts are the starting point for any breeding program aimed to develop resistant cultivars. The objective of this study was to analyze the resistance to Septoria tritici Rob in 77 F11 progenies of wheat derived from the three-way cross Tadinia &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; (Yecora rojo &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; UC554) in the phenological stages of seedling, tillering, and flag leaf/flowering. Three field experiments were conducted where plants were artificially inoculated at one of the above mentioned phenological stages by spraying with a suspension of conidia. A randomized block design with four replications was used in each experiment. Disease evaluations were made by measuring the foliar area covered with chlorotic and necrotic lesions in the seedling and tillering stages and the leaf area covered with pycnidia in the flag leaf/flowering stage, using disease rating scales. Differences (P &lt; 0.0001) were detected among progenies for Damaged Leaf Area (DLA) in all phenological stages. Joint analysis of variance for DLA indicated interaction between progeny and phenological stage (P &lt; 0.0001) for all binary combinations analyzed (seedling-tillering, seedling-flag leaf and tillering-flag leaf) as it also did for the triple combination involving the three phenological stages. It is necessary to evaluate resistance in more than one phenological stage to guarantee the correct selection of resistant genotypes.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400011
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90162004000400011
Formato: | text/html
Fonte: | Scientia Agricola  v.61 n.4 2004
Fonte: | info:eu-repo/semantics/openAccess