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Acta Botanica Brasilica

Print version ISSN 0102-3306

Acta Bot. Bras. vol.11 no.1 Feira de Santana July 1997

http://dx.doi.org/10.1590/S0102-33061997000100002 

Ontogenia dos estratos parietais da antera de Tabebuia pulcherrima Sandw. (Bignoniaceae)*

 

Ontogeny of the anther parietal layers of Tabebuia pulcherrima Sandw. (Bignoniaceae)

 

 

Nelson S. Bittencourt JrI; Jorge Ernesto de A. MariathII

ICentro de Ciências da Saúde, Universidade do Vale do Rio dos Sinos. Av. UNISINOS 950, CEP 93.022-000, São Leopoldo, Rio Grande do Sul, Brasil. Ex-bolsista da CAPES
IIDepartamento de Botânica, UFRGS. Av. Paulo Gama 40, CEP 90.046-900, Porto Alegre, Rio Grande do Sul, Brasil. Bolsa de Produtividade, CNPq

 

 


RESUMO

A ontogenia do tapete e dos demais estratos parietais, bem como o desenvolvimento do estômio e deiscência da antera de Tabebuia pulcherrima, foram presentemente estudados. O padrão de formação da parede do androsporângio é do tipo Dicotiledôneo. A camada parietal primária, a camada esporogênica e o tapete interno derivam-se diretamente do meristema fundamental. O tecido esporogênico, em cada androsporângio, visto em secção transversal, organiza-se numa fileira celular em forma de ferradura. O tapete é do tipo secretor e possui origem dual. O tapete interno diferencia-se precocemente em relação ao tapete externo. As duas camadas tapetais são discretamente dimórficas, mas tal dimorfismo é perdido no fim do estádio meiótico do esporângio. O dimorfismo tapetai e a precoce diferenciação do tapete interno são interpretados como expressão de um lapso ontogenético entre as duas camadas. Nas regiões dorso-laterais das tecas desenvolve-se um endotécio multiestratificado com espessamentos anelados ou helicoidais nas paredes celulares. A deiscência é precedida pela degeneração dos tecidos placentóides e ruptura dos septos interesporangiais. Apenas as células epidérmicas dos dois lados do sítio de ruptura do estômio (células estomiais) estão envolvidas com a ruptura do mesmo.

Palavras-chave: Bignoniaceae, Tabebuia, tapete, deiscência, ontogenia.


ABSTRACT

The ontogeny of the tapetum and parietal layers, as well as the stomium development and the dehiscence of the anther of Tabebuia pulcherima was studied. The anther wall formation follows the Dicotyledoneous type. The primary parietal layer, the sporogenous tissue, and the inner tapetum are differentiated directly from the ground meristem. The sporogenous tissue, as seeing in a transverse section, is organized in one cellular strip with a horseshoe outline. The tapetum is secretory and shows a distinct dual origin. The inner tapetai layer differentiates earlier than the outher. The two tapetai layers are moderately dimorphic. However, even such a dimorphism is lost at the end of the sporangium meiosis. The tapetai dimorphism and the precocious differentiation of the inner tapetum was interpreted as expression of a developmental gap between the two layers. At the four corners of the anther, a multilayered endothecium with annular or spiral fibrous thickenings in their cell walls is formed. The deiscence is preceded by the placentoid tissues degeneration and the rupture of the interesporangial septa. Only the epidermal cell rows, at the two sides of the stomial dehiscing place, are involved in the stomium rupturing.

Key words: Bignoniaceae, Tabebuia, tapetum, dehiscence, ontogeny


 

 

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Recebido em 9/9/96.
Aceito em 31/3/97

 

 

* Parte da dissertação de Mestrado do primeiro autor

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