Biologia reprodutiva da reófita Dyckia brevifolia Baker (Bromeliaceae), no Rio Itajaí-Açu, Santa Catarina, Brasil

Rogalski, Juliana Marcia; Reis, Ademir; Reis, Maurício Sedrez dos; Hmeljevski, Karina Vanessa

doi:10.1590/s0100-84042009000400008

Cited by 15 publications

(15 citation statements)

References 35 publications

(48 reference statements)

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“…This consideration is supported by the fact that after rehydration, the anthers resume the typical preanthesis form. Changes in morphology, as well as position of the anther during anthesis have been observed in other plant groups (Dettke & Santos 2011), including Dyckia (Rogalski et al 2009) and are related mainly to strategies of pollen grain dispersal and reproductive systems adopted by the species. As indicated by Rogalski et al (2009), in addition to the radial arrangement of the anthers, which turn the sporangia toward the gynoecium, this curvature also characterizes a self-pollination system commonly observed in other Bromeliaceae genera, including Dyckia (Smith & Downs 1974;Benzing 2000).…”

Section: Resultsmentioning

confidence: 86%

Stamen morphoanatomy of Dyckia Schult.f. (Bromeliaceae, Pitcairnioideae) species: new data for taxonomic use

et al. 2016

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Th is study presents a morphoanatomical analysis of Dyckia ibicuiensis, D. polyclada and D. racinae stamens. Flowers at anthesis were desiccated and their stamens were processed using common microtechniques for light microscopic analysis. Morphologically, the androecium in these species is diff erentiated by the disposition of the stamens around the gynoecium and by general anther characteristics. Included stamens, with antesepalous fi laments diff erent from those of the antepetalous, anthers in a radial disposition, always curved, and sporangia facing the gynoecium characterize D. ibicuiensis and D. racinae. Th is confi guration results from the fi lament connation, as well as special anatomical characteristics of the anthers, such as the connective with thickenings. In addition, these species are diff erentiated by the U-shaped thickening in the endothecium. D. polyclada is characterized by its small, free and exserted stamens, with a very short common tube, its anthers, that are not curved or organized around the gynoecium, and its divergent sporangia. Th e anatomical and morphological characteristics identifi ed here are important for characterization of these species. Considering that the androecium is important in the delimitation of Dyckia, the increased use of these data should be equally important for other species and infrageneric groupings.

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Section: Resultsmentioning

confidence: 86%

Stamen morphoanatomy of Dyckia Schult.f. (Bromeliaceae, Pitcairnioideae) species: new data for taxonomic use

et al. 2016

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“…, ) and Dyckia (Rogalski et al . ). One of the advantages of facultative autogamous plants is that they ensure the production of fruits with seeds, mainly when probabilities of cross‐pollination are very low due to the lack of pollinators or low population density (Granados & López ).…”

Section: Discussionmentioning

confidence: 97%

Reproductive biology of Aechmea bracteata (Sw.) Griseb. (Bromelioideae: Bromeliaceae)

et al. 2017

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Individuals of Aechmea bracteata show inflorescences with red scape bracts and odourless, yellow, tubular diurnal flowers, with closely arranged sexual organs, producing a large amount of fruits. In order to investigate the reproductive system of this species, a suite of characters was assessed: phenology, floral morphology and biology, nectar production dynamics, and fruit and seed production and germination, as a result of controlled pollination crosses. The study was conducted during two flowering seasons in wild populations in Yucatán, Mexico. Results suggest an annual flowering pattern with one flowering peak; flowers were diurnal, showing partial dichogamy (protandry)-herkogamy, anthers and stigma become mature before floral aperture, which could lead to self-pollination, nectar is produced during anthesis, varying in volume and total sugar concentration during the day; fruits and seeds were produced in all experimental crosses (cross-pollination, obligated cross-pollination, assisted and unassisted selfing, geitonogamy and apomixis), as well as high percentage seed germination. Several species of Aechmea are reportedly self-compatible and autogamous, as suggested by results of selfing and non-assisted selfing crosses, but these results are negated by the presence of apomixis, indicating that the species is apomictic. This is the first report of this breeding system for subgenus Aechmea and the sixth for Bromeliaceae. Polyembryony is here suggested for the first time in this genus and family based on the fact that more seeds were recorded that expected based on ovule numbers. Finally, when performing experimental crosses, estimating reproductive success based on number of seeds is a better approach than number of fruits, due to the effect of pseudogamy.

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“…D. racinae presents intermediate measurements relative to the other two species, despite the general structure of the flower, small compared to other dyckias, resembling that of D. ibicuiensis. The radial arrangement of the stamens reported for these species, as well as characters of the anthers, such as curvature and position of the sporangia, has been dealt with in other studies involving Dyckia species (Rogalski et al 2009), and are related to a system of self-pollination. Thus, while there are no similar studies in species related to D. polyclada, there may be peculiarities in the events of pollination in this species, due to occlusion of the corolla, as well as the distinct configuration of the androecium, features that may allow more inferences, not only of a reproductive nature, but also taxonomic, if assessed in other species.…”

Section: Discussionmentioning

confidence: 99%

Flower and floral trichome morphology of species of Dyckia Schult. f. (Bromeliaceae, Pitcairnioideae), and their importance to species characterization and genus taxonomy

2017

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Th is paper presents a morphological analysis of the fl ower and fl oral trichomes of three rare species of Dyckia: Dyckia ibicuiensis, D. polyclada and D. racinae. Flowers at anthesis were collected from natural populations and subjected to morphometric and microscopic analysis. Among the most representative features for Dyckia are: morphometrics of individual fl oral parts; the general confi guration of the androecium and gynoecium; the degree of fusion of the stigmatic lobes; the morphology of the ovules, especially in relation to the chalazal appendix; and the presence and constitution of peltate trichomes in the perianth, which exhibited a polymorphism not previously reported for Dyckia. Th e characters were eff ective at describing each species, proposing phylogenetic inferences and recognizing infrageneric groupings. We propose two species groups, which are consistent with previous hypotheses about the relationships among the species of the genus. Th e objective of this study was to provide fl oral morphological data useful for characterizing these three rare species, delimiting the genus and forming phylogenetic hypotheses.

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Biologia reprodutiva da reófita Dyckia brevifolia Baker (Bromeliaceae), no Rio Itajaí-Açu, Santa Catarina, Brasil

Cited by 15 publications

References 35 publications

Stamen morphoanatomy of Dyckia Schult.f. (Bromeliaceae, Pitcairnioideae) species: new data for taxonomic use

Stamen morphoanatomy of Dyckia Schult.f. (Bromeliaceae, Pitcairnioideae) species: new data for taxonomic use

Reproductive biology of Aechmea bracteata (Sw.) Griseb. (Bromelioideae: Bromeliaceae)

Flower and floral trichome morphology of species of Dyckia Schult. f. (Bromeliaceae, Pitcairnioideae), and their importance to species characterization and genus taxonomy

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