210 research outputs found
Toward in vitro fertilization in Brachiaria spp.
Brachiaria are forage grasses widely cultivated in tropical areas. In vitro pollination was applied to accessions of Brachiaria spp. by placing pollen of non-dehiscent anthers on a solid medium near isolated ovaries. Viability and in vitro germination were tested in order to establish good conditions for pollen development. Comparing sexual to apomictic plants, apomictic pollen has more abortion after meiosis during the microspore stage and a lower viability and, of both types, only some plants have sufficient germination in a high sugar concentration. Using in vitro pollination with the sexual plant, the pollen tube penetrates into the nucellus and micropyle, but the embryo sac degenerates and collapses. In the apomictic B. decumbens, in vitro pollination leads to the transfer of the sperm nuclei into the egg cell and the central cell. The results are discussed according to normal fertilization and barriers in sexual and apomictic plants
Breeding Panicum maximum in Brazil : 1. Genetic resources, modes of reproduction and breeding procedures
Produção de forragem e caracterÃsticas da estrutura do dossel de cultivares de Brachiaria brizantha sob pastejo
Contribuição dos caracteres de qualidade da forragem ao teor de proteÃna bruta em Urochloa brizantha
Biometrical analysis and selection of tetraploid progenies of Panicum maximum using mixed model methods
Meiotic behavior of interspecific hybrids between artificially tetraploidized sexual Brachiaria ruziziensis and tetraploid apomictic B. brizantha (Poaceae)
CaracterÃsticas morfogênicas e estruturais do capim-xaraés submetido à adubação nitrogenada e desfolhação
Microsporogenesis in Brachiaria bovonei (Chiov.) Robyns and B. subulifolia (Mez) Clayton (Poaceae)
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