Data/hora: 02/06/2024 08:24:16

Provedor de dados: | Acta Botanica Brasilica
País: | Brazil
Título: | Anatomia comparada das folhas e evolução das Podocarpineae
Autores: | Woltz,Ph; Gajardo,R; Ferreira,A.G.
Data: | 1987-07-01
Ano: | 1987
Palavras-chave: | Podocarpineae; Evolution; Anatomy comparative.
Resumo: | The anatomy of 112 species out of the 184 at present recognized is compared. The evolutionary sequence proposed shows in several different "series" the passage by successive transformations from an ancestral type with short one-nerved leaves, well-developed sub-epidermis and many resin canals to those with long wide leaves, first one-nerved then several-nerved, with reduced sub-epidermis and few resin canals. An over-evolved condition sometimes produces at the end of a "série" an apparent reversion to the ancestral type: leaves short or reduced to fleshy scales with late proliferation of canals separated in the mesophyll. A striking correlation between foliar anatomy and geographic latitude suggests, as with vascular evolution in seedlings at the cotyledon stage (WOLTZ, 1986), a greater age for the most southern taxa.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Português
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061987000200002
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/S0102-33061987000200002
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.1 n.2 1987
Fonte: | info:eu-repo/semantics/openAccess