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Adaptive leaf anatomical characteristics of Brachiaria ruziziensis genotypes (Poaceae) in different environments - doi: 10.4025/actascibiolsci.v35i4.18265 Biological Sciences
Santos, Fabíola Carvalho; Universidade Federal de Lavras; Techio, Vânia Helena; Universidade Federal de Lavras; Freitas, Aline Silva; Universidade Federal de Lavras; Castro, Evaristo Mauro de; Universidade Federal de Lavras; Davide, Lisete Chamma; Universidade Federal de Lavras; Sobrinho, Fausto Souza; Empresa Brasileira de Pesquisa Agropecuária.
Studies on morphological plasticity are extremely important to plant breeding seeking to optimize genotype interactions with their environments. The present study evaluated 38 genotypes of Brachiaria ruziziensis cultivated during the rainy (October to March) and dry (April to September) seasons and examined variations in their anatomical characteristics. Fully expanded leaves were collected and fixed in FAA70 (formaldehyde: acetic acid: ethyl alcohol) for 72h and subsequently stored in 70% alcohol. Median sections of leaf blades were examined and evaluated according to traditional plant anatomical procedures. Genotypes 15, 27, 40, 53, and 90 demonstrated interactions with the environment in five of the anatomical characteristics evaluated; genotypes 1 and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.03.00.00-0; 2.03.02.03-7 morphological plasticity; Plant anatomy; Plant breeding; Forage Anatomia vegetal.
Ano: 2013 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/18265
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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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