Complex of pollen mother cell and polyad production during microsporogenesis in <i>Hippocratea volubilis</i> (Hippocrateaceae)

Godoy, Sara Mataroli de; Alonso-Pereira, Andréia Rodrigues; Romagnolo, Mariza Barion; Risso-Pascotto, Claudicéia

doi:10.1080/00087114.2012.760881

Cited by 3 publications

(2 citation statements)

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“…Our data diverge from that of these authors, in terms of unit, type of endoaperture and ornamentation. It is stated in the literature that the pollen grains of this species can also occur in polyads or tetrads, due to the pollen grains' mother cells remaining united during microsporogenesis (Godoy et al 2012); however, this morphological variation was not identified in the samples of the collected species. The pollen grains of Hippocratea volubilis analyzed here are similar to those of other species of Monteverdia and Plenckia in having a subtriangular amb; however, they are the only ones with a suboblate shape in this study.…”

Section: Discussionmentioning

confidence: 93%

Contribution to Celastraceae palynology from Cerrado forest fragments: a focus on shape, amb and exine ornamentation

2023

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Forest fragments in the Cerrado are areas of prominent biological importance due to their great species richness and biodiversity. These areas host endemic species of Celastraceae, the knowledge of which contributes to the preservation of this biome. This study aims to characterize the pollen morphology of 10 native species of Celastraceae found in forest fragments in the state of São Paulo, Brazil, contributing to the knowledge of the taxa for future taxonomic studies, and providing data for the conservation of the species in the forest areas. The pollen grains were acetolyzed, measured, described qualitatively and illustrated using light microscopy and scanning electron microscopy. The pollen characters referring to the pollen unit, polarity, type and number of apertures are similar in all the species studied. The shape, amb and exine ornamentation of pollen grains are the diagnostic qualitative morphological data for Celastraceae in this study. Microreticulate pollen grains were observed in Celastrus, Hippocratea and Pristimera; reticulate pollen grains with a very thick exine characterize the analyzed species of Plenckia; and reticulate and microreticulate ornamentation was observed among the species of Monteverdia. The results obtained here allow us to distinguish species of the analyzed genera and confirm the pollen diversity previously reported for Celastraceae.

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Section: Discussionmentioning

confidence: 93%

Contribution to Celastraceae palynology from Cerrado forest fragments: a focus on shape, amb and exine ornamentation

2023

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“…However, successive cytokinesis occurs in Apocynum androsaefolium, Holarrhena antidysentrica (Lattoo 1974), Plumeria diffusa and Plumeria rubra (Chauhan 1979). Godoy et al (2012) …”

Section: Discussionmentioning

confidence: 99%

Investigation of mitosis, microsporogenesis and pollen germination in the critically endangered plantAmsonia orientalis(Apocynaceae)

2013

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Amsonia orientalis Decne. (Apocynaceae) is a medically useful and critically endangered plant which has very restricted distribution world-wide. The root tips and flower buds of A. orientalis were used as an experimental material and they were squashed in aceto-orcein. Fresh flowers and a liquid medium were used for pollen germination tests. In spite of the small size of the cells and chromosomes, all phases of mitosis and meiosis were observed. Generally the phases of mitosis were regular but there were a few abnormalities, such as laggard chromosome in metaphase and bridge formation in anaphase. There was a good relationship between the stages of pollen development and floral bud length. As a result of the cytokinesis, tetrahedral types of tetrads were occurred in microsporogenesis. The tetrad nuclei resulting from the simultaneous type of meiosis were found to be of equal size. Pollen germination had started from the first hour and pollen tube lengths and germination percentages regularly increased with increasing time. This is the first study that identifies mitotic and meiotic cycles and pollen germination in A. orientalis. Our findings about the mitosis and reproduction biology of this critically endangered plant will be useful for in vitro and in situ conservation, taxonomic and genetic studies.

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Why so many flowers? A preliminary assessment of mixed pollination strategy enhancing sexual reproduction of the invasive <i>Acacia longifolia</i> in Portugal

Giovanetti¹,

Ramos²,

Máguas³

2018

Web Ecol.

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Abstract. Acacia longifolia, a native legume from Australia, has been introduced in many European countries and elsewhere, thus becoming one of the most important global invasive species. In Europe, its flowering occurs in a period unsuitable for insect activity: nonetheless it is considered entomophilous. Floral traits of this species are puzzling: brightly coloured and scented as liked by insects, but with abundant staminate small-sized flowers and relatively small pollen grains, as it is common in anemophilous species. Invasion processes are especially favoured when reshaping local ecological networks, thus the interest in understanding pollination syndromes associated with invasive plant species that may facilitate invasiveness. Moreover, a striking difference exists between its massive flowering and relatively poor seed set. We introduced a novel approach: first, we consider the possibility that a part of the pollination success is carried on by wind and, second, we weighted the ethological perspective of the main pollinator. During the flowering season of A. longifolia (February-April 2016), we carried on exclusion experiments to detect the relative contribution of insects and wind. While the exclusion experiments corroborated the need for pollen vectors, we actually recorded a low abundance of insects. The honeybee, known pollinator of acacias, was relatively rare and not always productive in terms of successful visits. While wind contributed to seed set, focal observations confirmed that honeybees transfer pollen when visiting both the inflorescences to collect pollen and the extrafloral nectaries to collect nectar. The mixed pollination strategy of A. longifolia may then be the basis of its success in invading Portugal's windy coasts.

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Complex of pollen mother cell and polyad production during microsporogenesis in Hippocratea volubilis (Hippocrateaceae)

Cited by 3 publications

References 29 publications

Contribution to Celastraceae palynology from Cerrado forest fragments: a focus on shape, amb and exine ornamentation

Contribution to Celastraceae palynology from Cerrado forest fragments: a focus on shape, amb and exine ornamentation

Investigation of mitosis, microsporogenesis and pollen germination in the critically endangered plantAmsonia orientalis(Apocynaceae)

Why so many flowers? A preliminary assessment of mixed pollination strategy enhancing sexual reproduction of the invasive <i>Acacia longifolia</i> in Portugal

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Complex of pollen mother cell and polyad production during microsporogenesis in Hippocratea volubilis (Hippocrateaceae)

Cited by 3 publications

References 29 publications

Contribution to Celastraceae palynology from Cerrado forest fragments: a focus on shape, amb and exine ornamentation

Contribution to Celastraceae palynology from Cerrado forest fragments: a focus on shape, amb and exine ornamentation

Investigation of mitosis, microsporogenesis and pollen germination in the critically endangered plantAmsonia orientalis(Apocynaceae)

Why so many flowers? A preliminary assessment of mixed pollination strategy enhancing sexual reproduction of the invasive &lt;i&gt;Acacia longifolia&lt;/i&gt; in Portugal

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Why so many flowers? A preliminary assessment of mixed pollination strategy enhancing sexual reproduction of the invasive <i>Acacia longifolia</i> in Portugal