Reproductive biology of <i>Aechmea bracteata</i> (Sw.) Griseb. (Bromelioideae: Bromeliaceae)

Pool-Chalé, M.; Ramírez‐Morillo, Ivón M.; Carnevali, Germán; Hornung‐Leoni, Claudia T.

doi:10.1111/plb.12645

Cited by 11 publications

(6 citation statements)

References 46 publications

(75 reference statements)

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“…The Tillandsia species in the present study have a mixed mating system, comprising autogamy and geitonogamy, which resulted in the highest fruit and seed set; however, we also recorded a low frequency of fruit set from agamospermy. A low prevalence of fruit production under apomixis has also been recorded in Brazilian species of Pitcairnia (<15%) (Wendt et al, 2002), whereas in Aechmea bracteata apomictic fruit set shows a similar frequency to fruit set from other pollination systems (Pool‐Chale, Ramírez‐Morillo, Carnevali Fernández‐Concha, & Hornung‐Leoni, 2018). The fruit and seed set we recorded as a result of agamospermy may be attributable to the experimental treatment, but the possibility of pollen contamination during manipulations cannot be excluded.…”

Section: Discussionmentioning

confidence: 82%

Floral biology and potential hybridization of three sympatric epiphytic bromeliads in Veracruz, Mexico

Ramírez‐Rosas¹,

Aguirre‐Jaimes

Ramírez‐Morillo

et al. 2020

Plant Species Biology

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In the Bromeliaceae, hybrids have been engineered for horticultural purposes; in addition, hybrids have been observed in natural habitats. We investigated the hybridization potential of three sympatric species of Tillandsia inhabiting secondary forests and shaded coffee plantations in the central mountains of Veracruz, Mexico. The studied species (T. juncea, T. polystachia and T. variabilis) show overlap in flowering phenology and are believed to share pollinators. We compared the floral morphology of the species, performed controlled intra-and interspecific pollinations, and recorded pollen tube growth, fruit and seed set, as well as seed germination. Flower size differed among the species, but stamen and stigma heights were similar between pairs of species, which would facilitate interspecific pollen exchange. Pollen tubes reached the ovary in interspecific crosses. The three species showed interspecific crosscompatibility, as all crosses resulted in development of mature fruit and viable seeds. Tillandsia juncea achieved the highest fruit set, whereas T. variabilis showed the highest seed set. Seed set as a result of agamospermy, autogamy, geitonogamy and interspecific cross-pollination did not differ among the species. The findings suggest that pre-and post-pollination barriers are weak among the three species of Tillandsia, which thus could potentially hybridize in natural sympatric populations. K E Y W O R D Sfruit and seed set, interspecific crosses, intraspecific crosses, seed germination, Tillandsia species | INTRODUCTIONPlant hybridization involves the mating of two closely or distantly related taxa, followed by the production of viable seeds, germination and growth of seedlings (Marques, Roselló-Graell, Draper, & Iriondo, 2007;Soltis & Soltis, 2009). The genetic and demographic effects derived from hybridization are among the leading causes of population decline (

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Section: Discussionmentioning

confidence: 82%

Floral biology and potential hybridization of three sympatric epiphytic bromeliads in Veracruz, Mexico

Ramírez‐Rosas¹,

Aguirre‐Jaimes

Ramírez‐Morillo

et al. 2020

Plant Species Biology

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“…The steady-state flowering pattern is often related to plants visited by trapline foraging pollinators, such as hummingbirds and many tropical bees, which are characterised by having a repeated and fixed visitation route capable of covering long distances (Janzen 1971;Gentry 1974;Tello-Ramos et al 2015). Visits by trapliners are common in Bromeliaceae (Canela & Sazima 2003a;Kessler et al 2020) and have been reported for other species of Aechmea (Canela & Sazima 2003a;Lenzi et al 2006;Kamke et al 2011;Scrok & Varassin 2011;Pool-Chalé et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Reproductive biology and flower-visitor interactions of two bromeliad species from the Brazilian Atlantic Forest

Silva¹,

Barbosa²,

Faria³

2022

plecevo

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Background and aims – The Bromeliaceae family has great importance in the maintenance of neotropical communities. In the Brazilian Atlantic Forest, bromeliads are among the major groups responsible for maintaining the local flora and fauna and participate in important ecological interactions with insects, anurans, and hummingbirds. This work reports on aspects of the reproductive biology and the interactions between two endemic bromeliad species from the Atlantic Forest (Aechmea bruggeri and Quesnelia indecora) and their floral visitors to assess the impact of these relationships on the reproductive success and conservation of these plants.Material and methods – Reproductive phenology, floral biology, pollination experiments, and the reproductive success of both species were investigated. To determine the floral visitors, we made direct observations on flowers and collected floral visitors that could not be identified in the field.Key results – Aechmea bruggeri and Quesnelia indecora presented the individual and population flowering phenological pattern classified as annual with intermediate duration. The species are partially and totally self-incompatible, respectively. Both species presented a varied visitation guild, and although Q. indecora presented flowers with ornitofilous characteristics, no hummingbirds were recorded for this species. The hummingbird Thalurania glaucopis was the main visitor for Aechmea bruggeri and the bee Trigona cf. braueri was the main visitor for Quesnelia indecora. Nectar thieving by lepidopterans was observed for both species. Pollen robbing by beetles and nectar robbing by bees were registered for Aechmea bruggeri and Quesnelia indecora, respectively. Fruit and seed set of both species were highly affected by herbivory, which may negatively affect their reproductive success.Conclusion – Our work highlights the important role of bromeliads in neotropical communities, showing how floral visitors and plants interact by participating in maintaining biological diversity in the studied forest remnant.

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“…In these cases, pollinators would be still required for successful pseudogamy, because insects moving around within the flower would disperse the pollen, and pollinator visits between flowers in different developmental stages within the same individual would overcome dichogamy. No detailed case studies addressed this question so far for pseudogamy (one case study on breeding systems of Aechmea revealed autonomous apomixis [ 84 ]). A second major constraint of pseudogamy is potential endosperm imbalance after fertilization of the polar nuclei, i.e., deviations from the optimal 2:1 ratio of maternal to paternal genome copies in the endosperm (e.g., [ 85 ]).…”

Section: Factors Related To Mode Of Reproductionmentioning

confidence: 99%

Geographical Parthenogenesis in Alpine and Arctic Plants

Hörandl

2023

Plants

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The term “Geographical parthenogenesis” describes the phenomenon that asexual organisms usually occupy larger and more northern distribution areas than their sexual relatives, and tend to colonize previously glaciated areas. Several case studies on alpine and arctic plants confirm the geographical pattern, but the causal factors behind the phenomenon are still unclear. Research of the last decade in several plant families has shed light on the question and evaluated some of the classical evolutionary theories. Results confirmed, in general, that the advantages of uniparental reproduction enable apomictic plants to re-colonize faster in larger and more northern distribution areas. Associated factors like polyploidy seem to contribute mainly to the spatial separation of sexual and asexual cytotypes. Ecological studies suggest a better tolerance of apomicts to colder climates and temperate extremes, whereby epigenetic flexibility and phenotypic plasticity play an important role in occupying ecological niches under harsh conditions. Genotypic diversity appears to be of lesser importance for the distributional success of asexual plants. Classical evolutionary theories like a reduced pressure of biotic interactions in colder climates and hence an advantage to asexuals (Red Queen hypothesis) did not gain support from studies on plants. However, it is also still enigmatic why sexual outcrossing remains the predominant mode of reproduction also in alpine floras. Constraints for the origin of apomixis might play a role. Interestingly, some studies suggest an association of sexuality with abiotic stresses. Light stress in high elevations might explain why most alpine plants retain sexual reproduction despite other environmental factors that would favor apomixis. Directions for future research will be given.

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

Cited by 11 publications

References 46 publications

Floral biology and potential hybridization of three sympatric epiphytic bromeliads in Veracruz, Mexico

Floral biology and potential hybridization of three sympatric epiphytic bromeliads in Veracruz, Mexico

Reproductive biology and flower-visitor interactions of two bromeliad species from the Brazilian Atlantic Forest

Geographical Parthenogenesis in Alpine and Arctic Plants

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