Data/hora: 09/06/2024 04:42:42

Provedor de dados: | Ciência Rural
País: | Brazil
Título: | Genetic analysis of tropical rust resistance in popcorn lines
Autores: | Sanches,Rafael Egea; Scapim,Carlos Alberto; Tessmann,Dauri José; Vieira,Rafael Augusto; Rodovalho,Marcos de Araújo; Milani,Klayton Flávio.
Data: | 2011-06-01
Ano: | 2011
Palavras-chave: | Zea mays L.; Physopella zeae; Genetic parameters; General and specific combining ability; Artificial inoculation.
Resumo: | The objectives of this study were to identify promising popcorn lines and hybrids for genetic resistance to tropical rust (Tr, Physopella zeae) in diallel crosses of nine lines derived from a large part of Brazilian popcorn germplasm and to estimate genetic parameters for Tr resistance. Crosses and checks were tested in a random block design, with artificial inoculations under greenhouse conditions. Plots consisted of a single 14-L pot, with four plants. Tr was measured by severity and area under the disease progress curve. Data was analyzed by Griffing's diallel model, and genetic parameters were estimated. Heritability estimates to Tr resistance was medium. Specific combining ability-SCA had significant effects (P&lt;0.10) for resistance, and was eight to nine times larger than general combining ability-GCA (P&amp;gt;0.10). This indicated the major importance of non additive gene effects. In general, breeding possibilities for resistance was restricted. The line 9 (L7.4) had the most outstanding GCA for resistance to Tr, and hybrids 1×7 and 3×6 had outstanding SCA and were recommended for breeding.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000600008
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/S0103-84782011000600008
Formato: | text/html
Fonte: | Ciência Rural  v.41 n.6 2011
Fonte: | info:eu-repo/semantics/openAccess