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Association between the morphological and productive characteristics in the selection of elephant grass clones

2011; Sociedade Brasileira de Zootecnia; Volume: 40; Issue: 3 Linguagem: Inglês

10.1590/s1516-35982011000300004

1806-9290

Márcio Vieira da Cunha, M. A. Lira, Mércia Virgínia Ferreira dos Santos, Erinaldo Viana de Freitas, José Carlos Batista Dubeux, Alexandre Carneiro Leão de Mello, Kalina Gerciane Rodovalho Martins,

Turfgrass Adaptation and Management

The objectives in this work were to study the association between the morphological and productive characteristics in Pennisetum sp. clones, and to identify the morphological characteristics responsible for the productivity in Pennisetum cp. clones. The canonical correlations were evaluated and the path analysis was made from the simple genotypic correlation matrix between the morphological and productive characteristics of eight Pennisetum sp. clones (Taiwan A-146 2.37, Taiwan A-146 2.27, Taiwan-146 2.114, Merker México MX 6.31, Mott, HV-241, Elefante B and IRI-381). The canonical correlations were significant at 1% probability by the Chi-square test. The first pair of canonic factors, with correlation of 0.9999, related the plants with the highest dry matter content to plants with lower leaf area indexes, light perception and leaf angle. The second pair of canonic factors, with correlation of 0.9999, related the plants with the highest dry matter production to the plants with higher basal tiller density, height, and low green leaf number per tiller. The results of the path analysis indicated that the light interception is determinant in dry matter content expression of Pennisetum sp. clones, while the basal tiller density and plant height are responsible for dry matter production in these clones.