Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/40510
Título: Morphology and pollen viability of Lolium multiflorum Lam.
Título(s) alternativo(s): Morfologia e viabilidade polínica de Lolium multiflorum Lam.
Palavras-chave: Scanning electron microscopy
Ryegrass
Acetolysis
Microscopia de varredura
Azevém
Acetólise
Data do documento: Abr-2012
Editor: Editora UFLA (Editora da Universidade Federal de Lavras)
Citação: NUNES, R. de C. et al. Morphology and pollen viability of Lolium multiflorum Lam. Ciência e Agrotecnologia, Lavras, v. 36, n. 2, p. 180-188, mar./abr. 2012. DOI: 10.1590/S1413-70542012000200006.
Resumo: Study and characterization of pollen grains are essential for different areas, especially taxonomy, genetic improvement, phylogeny, and paleobotany. As yet, there are no reports on pollen morphology of genotypes of naturalized Lolium multiflorum Lam., introduced cultivars or breeding populations, diploid or polyploid. Ten genotypes of annual ryegrass (L. multiflorum) were evaluated for the viability of pollen grains using propionic carmine and Alexander's stains, while morphology was assessed by the acetolysis technique. Measures of polar axis (P), equatorial diameter (E), exine thickness, and analysis of pollen grains were obtained by scanning electron microscopy (SEM). All genotypes showed high rate of pollen viability (> 89%) for both stains. There were differences between genotypes in the following quantitative traits: polar axis, equatorial diameter, exine, endexine, ektexine, and P/E ratio. Pollen grains were characterized as small, monoporates, with circular and non-prominent apertures. In addition to helping distinction of pollen grains, morphometric differences can be used later to compare ploidy levels, thus assisting in breeding programs of the species.
URI: http://repositorio.ufla.br/jspui/handle/1/40510
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