Data/hora: 11/06/2024 12:42:59

Provedor de dados: | 63
País: | Brazil
Título: | Resistance to stem canker, frogeye leaf spot and powdery mildew of soybean lines lacking lipoxigenases in the seeds
Autores: | Martins,Carlos Alberto Osório; Sediyama,Carlos Sigueyuki; Oliveira,Maria Goreti de Almeida; Reis,Múcio Silva; Rocha,Valterley Soares; Moreira,Maurílio Alves; Gomes,José Luiz Lopes.
Data: | 2002-12-01
Ano: | 2002
Palavras-chave: | Glycine max; Breeding; Genetics.
Resumo: | The soybean [Glycine max (L.) Merrill] crop holds a prominent position in the Brazilian economy because of the extension of the planted area and volume of grain production, but the beany flavor has been a limiting factor for soybean derivatives consumption by western population. This flavor is produced mainly by action of lipoxygenase enzymes (Lox1, Lox2 and Lox3), present in some commercial varieties. The genetic elimination of the alleles that codify these enzymes is the most appropriate way to avoid problems associated to this deleterious flavor. To elucidate the effect of seed lipoxygenase elimination on the resistance to plant pathogens, normal varieties of soybean (FT-Cristalina RCH, Doko RC and IAC-12) and their backcross-derived lines, both with the three lipoxygenases present in their seeds (triple-positive, TP) and without the three lipoxygenases (triple-null, TN), were tested for their resistance to stem canker (Diaporthe phaseolorum f.sp. meridionalis), frogeye leaf spot (Cercospora sojina Hara), and powdery mildew (Microsphaera diffusa Cke. &amp;amp; Pk.). All genetic materials studied were resistant to stem canker. FT-Cristalina RCH and Doko-RC and their TP and TN lines were resistant to frogeye leaf spot. IAC-12 and its derived lines not only presented a higher disease index, but also the derived lines, TP and TN, were more susceptible, indicating the loss of genes for disease resistance in the backcrosses. There was no association between the elimination of lipoxygenases from the seeds with the resistance to frogeye leaf spot. In relation to the powdery mildew, TP or TN lines presented similar or higher resistance than their respective recurrent parents whose susceptibility appeared in the following order: IAC-12, less susceptible, Doko-RC, intermediate and FT-Cristalina RCH, more susceptible.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400013
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90162002000400013
Formato: | text/html
Fonte: | Scientia Agricola  v.59 n.4 2002
Fonte: | info:eu-repo/semantics/openAccess