Elucidating the mechanism of poricidal anther dehiscence in Miconia species (Melastomataceae)

Autor(es)

Cortez, Priscila Andressa ^{[1, 2]} ; de Souza Caetano, Ana Paula ^{[3, 1]} ; Carmello-Guerreiro, Sandra Maria ^[4] ; Teixeira, Simone Padua ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, Programa Posgrad Biol Vegetal, BR-13083970 Campinas, SP - Brazil

^[2] Univ Estadual Santa Cruz, Dept Ciencias Biol, Ctr Microscopia Eletron, BR-45662900 Ilheus, BA - Brazil

^[3] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Dept Ciencias Farmaceut, BR-14040903 Ribeirao Preto, SP - Brazil

^[4] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FLORA; v. 209, n. 10, p. 571-579, 2014.
• Citações Web of Science: 2

Resumo

Melastomataceae have porate anthers. However, unlike Solanaceae and many monocots, in which the poricidal dehiscence depends on the presence of a mechanical layer (often the endothecium), most members of Melastomataceae have no evident specialized layer related to the poricidal opening. The goal of this study was to characterize the tissues that form the apical pore of the anther in 10 Miconia species, which may help to understand the nearly unknown mechanism of anther dehiscence in this genus, considered to be one of the largest and most diverse New World genera. Before anthesis, the apical pores of all of the species are closed by a uniseriate epidermis, the cells of which lack a cuticle. In contrast, the epidermis of the remainder of the anther is covered by a thick, ornamented cuticle. Among Myrtales, the Melastomataceae form a clade with Alzateaceae, Crypteroniaceae and Penaeaceae, almost all of which have anthers with endothecium lacking wall thickenings. In these families, the endothecium may or may not be present in the mature anther, with degenerating cells in the latter case. Anther dehiscence does not depend on the endothecium as the mechanical layer, and this process is still not well understood. However, in the Miconia species studied here, the cuticle may prevent tissue dehydration, and the pore opening seems to be due to the passive process of dehydration taking place only in the pore region due to the absence of the cuticle. (C) 2014 Elsevier GmbH. All rights reserved. (AU)

• Processo FAPESP: 07/52030-0 - Desenvolvimento dos estratos parietais da antera e dos andrófitos em espécies de Miconia (Melastomataceae) com diferentes sistemas reprodutivos
• Beneficiário: Priscila Andressa Cortez
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 08/10793-0 - Embriologia em espécies de Miconia (Melastomataceae) com diferentes sistemas reprodutivos
• Beneficiário: Sandra Maria Carmello-Guerreiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular