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Repeatability of agronomic characters in Brachiaria brizantha cultivars R. Bras. Zootec.
Martuscello,Janaina Azevedo; Braz,Thiago Gomes dos Santos; Jank,Liana; Cunha,Daniel de Noronha Figueiredo Vieira da; Souza,Madson Williame Melo; Brito,Gerlane Ferreira de; Oliveira,Leandro Pereira de.
This experiment was carried out with the objectives of determining repeatability coefficients, the number of harvests necessary to increase accuracy and the genotypic stability of yield characteristics in Brachiaria brizantha cultivars in the northeast region of Brazil in the period from July 2009 to March 2011. The experimental design used was completely randomized with three treatments (Brachiaria brizantha var. Marandu, Xaraés and Piatã) and three replications. Each plot was harvested seven times: five in the rainy season and two in the dry season. Immediately after each harvest, the forage was weighed and dried to obtain total, stem, leaf and dead dry matter yields. For the estimation of the repeatability coefficient, analysis of variance, principal...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Forage breeding; Forage production; Selection.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000100005
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Intra-inflorescence pollen viability in accessions of Brachiaria ruziziensis Biological Sciences
Paula, Cristina Maria Pinto de; Universidade Federal de Lavras; Techio, Vânia Helena; Universidade Federal de Lavras; Benites, Flavio Rodrigo Gandolfi; Empresa Brasileira de Pesquisa Agropecuária; Sobrinho, Fausto de Souza; Empresa Brasileira de Pesquisa Agropecuária.
Knowledge about the pollen viability is important to ensure success in controlled hybridizations and, consequently, support breeding programs. The aims of this study were to evaluate the pollen viability in progenies of artificially induced tetraploid accessions of Brachiaria ruziziensis, and to verify if the position of the flower buds on the raceme affects the pollen viability rate. Staining of aborted and non-aborted pollen (Alexander’s technique) was used to determine the viability of the pollen grains. Tetraploid accessions of B. ruziziensis plants had high pollen viability (x = 76.8% to x = 99.6%). Some of these plants had viability rates similar to diploid B. ruziziensis, showing that the induction of chromosome duplication by colchicine did not...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.02.00.00-5 Fertility; Pollen grain; Forage breeding; Forage grass.
Ano: 2014 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/19440
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