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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
02/01/1992 |
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Data da última atualização: |
29/07/2025 |
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Autoria: |
BREWBAKER, J. L. |
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Título: |
The distribution and phylogenetic significance of binucleate and trinucleate pollen grains in the angiosperms. |
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Ano de publicação: |
1967 |
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Fonte/Imprenta: |
American Journal of Botany, Bronx, v. 54, p. 1069-1083, 1967. |
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Idioma: |
Inglês |
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Conteúdo: |
Studies of the cytology of angiosperm pollen which extend our knowledge of the distribution of binucleate and trinucleate pollen to almost 2,000 species of flowering plants are summarized. Approximately 70% of the species studied release pollen in a binucleate stage, and none of them shed both types of pollen as a constant varietal trait. All phylogenetically primitive taxa are binucleate. The trinucleate trait evidently has originated independently at many times during angiosperm evolution. In no instance must one infer the origin of binucleate taxa from trinucleate ancestors. Most genera are monotypic with respect to pollen cytology, and only 10 genera are known to include both binucleate and trinucleate species. Among the 265 families studied, 179 include only binucleate genera and 54 include only trinucleate genera, while 32 include both types. Nearly all aquatic species with submersed flowers shed pollen in a trinucleate stage. A group of physiological differences which distinguish binucleate and trinucleate pollen is reviewed in relation to the survival and possible selective advantage of trinucleate mutants, and the significance of the binucleate pollen grain in the origin and evolution of flowering plants is discussed. |
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Palavras-Chave: |
Filogenética. |
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Thesagro: |
Pólen. |
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Thesaurus Nal: |
Angiospermae. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01749naa a2200157 a 4500
001 1278776
005 2025-07-29
008 1967 bl uuuu u00u1 u #d
100 1 $aBREWBAKER, J. L.
245 $aThe distribution and phylogenetic significance of binucleate and trinucleate pollen grains in the angiosperms.$h[electronic resource]
260 $c1967
520 $aStudies of the cytology of angiosperm pollen which extend our knowledge of the distribution of binucleate and trinucleate pollen to almost 2,000 species of flowering plants are summarized. Approximately 70% of the species studied release pollen in a binucleate stage, and none of them shed both types of pollen as a constant varietal trait. All phylogenetically primitive taxa are binucleate. The trinucleate trait evidently has originated independently at many times during angiosperm evolution. In no instance must one infer the origin of binucleate taxa from trinucleate ancestors. Most genera are monotypic with respect to pollen cytology, and only 10 genera are known to include both binucleate and trinucleate species. Among the 265 families studied, 179 include only binucleate genera and 54 include only trinucleate genera, while 32 include both types. Nearly all aquatic species with submersed flowers shed pollen in a trinucleate stage. A group of physiological differences which distinguish binucleate and trinucleate pollen is reviewed in relation to the survival and possible selective advantage of trinucleate mutants, and the significance of the binucleate pollen grain in the origin and evolution of flowering plants is discussed.
650 $aAngiospermae
650 $aPólen
653 $aFilogenética
773 $tAmerican Journal of Botany, Bronx$gv. 54, p. 1069-1083, 1967.
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| 1. |  | MANSUR, D. K. C.; KAMIYAMA, C. M.; VICENTINI, N. M.; TEODORO, W. A. M.; OTENIO, M. H. Agroindústrias de leite e derivados e a implantação dos programas de autocontrole. In: COSTA, F. F.; HÚNGARO, H. M.; RODARTE, M. P. (org.). Gestão, qualidade e inovações tecnológicas: produções acadêmicas em ciência e tecnologia do leite e derivados. Juiz de Fora: Editar, 2023. v. 1. p. 49-66.| Tipo: Capítulo em Livro Técnico-Científico |
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