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| Pereira Coutinho, A.; Sá da Bandeira, D.; Currais, L.; Soukiazes, E.; Ortiz, S.. |
| The pollen morphology of Gladiopappus vernonioides was studied with transmission (TEM) and scanning (SEM) electron microscopy and with light microscopy (LM). An Anthemoid pattern of exine ultrastructure was found. The pollen morphology of Gladiopappus supports the inclusion of this genus in the tribe Dicomeae and subtribe Dicominae but not in the Mutisieae s.str. The apertural system of G. vernonioides includes a mesoaperture that intersects the foot layer and the upper layer of the endexine, a condition already pointed out for several tribes of Asteroideae (Helenieae, Gnaphaliinae, Heliantheae, Inuleae, Senecioneae) and Carduoideae (Cardueae, Dicomeae). It is suggested that the existence of an intermediate aperture could characterize the apertural system... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Dicomeae; Exine; LM; Mutisieae; Pollen; SEM; TEM. |
| Ano: 2018 |
URL: http://www.repository.naturalis.nl/record/655821 |
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| Montes,B; Murray,MG. |
| Palynological studies contribute to understanding the taxonomy, phylogeny and ecology of the Asteraceae and other families. In this study, pollen morphology and ultrastructure of the exine of Senecio bergii Hieron. were studied using light, scanning and transmission electron microscopy. The pollen of this species is prolate-spheroidal, it has a Senecioid pattern on the exine and an apertural system composed of three apertures (ecto-, meso- and endoapertures). This pollen type is defined as tricolpororate due to the triple apertural system. This is the first description of the ultra-structure of the apertural system of the pollen of Argentine species of Senecio. The presence of mesoapertures and the description of the ultrastructure of the pollen of Senecio... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Senecio; Pollen; Exine; Mesoaperture; Ultrastructure. |
| Ano: 2015 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100027 |
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| Souza,Margarete Magalhães; Martins,Ernane Ronie; Pereira,Telma Nair Santana; Oliveira,Luiz Orlando de. |
| The aim of this work was to carry out the reproductive studies on Brazilian accessions of ipecac, Psychotria ipecacuanha. It presented heterostyly, with brevistylous and longistylous flowers. The pollen development was observed from the sections of the anthers embedded in resin. Anther development was normal as usually observed in dicotyledones, displaying four layers: outer epidermis, endothecium, middle layer and inner tapetum. The pollen was bicellular and filled with starch at the microspore stage. Pollen morphology was studied using SEM, which showed pollen polymorphism within and between the two floral morphs. Five types of pollen with reticulate or perforate exine were identified. The characteristics showed that the sexual process was as important... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ipecac; Heterostyly; Anther anatomy; Microsporogenesis; Exine. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000500015 |
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