Análise da interação genótipo X ambiente assistida por marcadores moleculares em milho (Zea mays L.). / Genotipe x environment interaction analysis assisted by molecular markers in maize (Zea mays L.).

AUTOR(ES)

Glauce Cristina Ricardo Rumin

DATA DE PUBLICAÇÃO

2005

RESUMO

Grain yield in maize is a complex trait, highly dependent on environmental conditions. Identification of consistent chromosomal regions across environments related to this trait is desirable in the context of marker assisted selection. This work was aimed at identifying regions associated with maize grain yield by stepwise multiple regression analysis in several environments. Maize S2 lines were genotyped by 163 RFLP loci and topcrossed to four different testers. These top crosses were evaluated in 11 locations. Grain yield associated markers were identified for each environment and the consistency of expression of associated genes was verified. Most of the chromosome regions were environment specific. After marker identification for each environment, a selection index was applied, which was composed by the performance of a line in topcross and a measure of genetic complementarity. The best lines were grouped by tester across locations and the coincidence of superior lines varied from 48.5% to 80.0%. The use of molecular markers showed that genotype x environment interaction was due to a high expression inconsistency of chromosome regions related to grain yield in maize across environment. Nonetheless, the coincidence between superior lines indicated the possibility to selecting lines with good performance along environments, even in the presence of genotype x environment interaction.

ASSUNTO(S)

genotype x environment interaction plant breeding marcador molecular milho imbred line rflp interação genótipo – ambiente molecular marker melhoramento genético vegetal rflp linhagem vegetal maize

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