A new species of Hohenbergia (Bromeliaceae) from the Atlantic Forest of Northeast Brazil

Gonçalves-Oliveira, Rodrigo Cesar; Wanderley, Maria das Graças Lapa

doi:10.11646/phytotaxa.302.3.9

Phytotaxa

2017

DOI: 10.11646/phytotaxa.302.3.9

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A new species of Hohenbergia (Bromeliaceae) from the Atlantic Forest of Northeast Brazil

Rodrigo Cesar Gonçalves-Oliveira¹,

Maria das Graças Lapa Wanderley

Abstract: Hohenbergia isepponae (Bromeliaceae), a new species from the Atlantic Forest of Pernambuco, Brazil is described and illustrated herewith. We also compared it with the morphologically similar species.

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Hohenbergia erecta (Bromeliaceae: Bromelioideae), a New Once-branched Species from Chapada Diamantina, Bahia State, Brazil

Cavalcante

Silva²,

Souza³

et al. 2022

Tropical Plant Biol.

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Hohenbergia is one the most diverse genus in Bahia state, inhabits almost all region of the state. As a result of ongoing studies on the genus Hohenbergia in Bahia, Brazil, here we describe and illustrate Hohenbergia erecta, endemic to the municipality of Mucugê, at Chapada Diamantina. Hohenbergia erecta differs from its morphologically related, H. catingae, by an elongated aspect provided by the tubular rosette (vs short stem with a crateriform rosette), and a once-branched cylindrical in orescence (vs 2-3brached pyramidal in orescence), with branches congested at the apex (vs branches laxly arranged). Due to a small distribution area in the Caatinga forest and based on a spatial analysis we categorized it as Endangered (EN), following the IUCN criteria. Hohenbergia erecta is endemic of the central region of Chapada Diamantina, being described as dominant in the area, where no other Hohenbergia species inhabits. It is important, however, that new eld expeditions are conducted in the region to observe the richness of the genus at Chapada Diamantina.

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Hohenbergia erecta (Bromeliaceae: Bromelioideae), a New Once-branched Species from Chapada Diamantina, Bahia State, Brazil

Cavalcante

Silva²,

Souza³

et al. 2022

Tropical Plant Biol.

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Genome size and chromosome number conservation contrasting with karyotype diversity in Hohenbergia (Bromelioideae, Bromeliaceae)

Gonçalves-Oliveira

Ximenes

Oliveira

et al. 2019

Botanical Journal of the Linnean Society

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Plant evolution may be triggered by significant chromosome changes. In some plant groups, karyoevolution played an important role, influencing speciation processes. Hohenbergia comprises 48 species distributed through eastern Brazil. Previous cytological information includes few species and only chromosome counts, lacking information about genome size and more accurate karyomorphological investigation. Here, we compare cytomolecular features and genome sizes of 12 Hohenbergia spp. Besides, new measurements of genome sizes of 32 species are reported. All studied species presented 2n = 50, a number prevalent in Bromelioideae. The genome sizes (2C) varied from 0.74 to 1.52 pg. Despite the apparent homogeneity in chromosome number and genome size in Hohenbergia, significant polymorphism was observed in regard to the distribution of CMA+/DAPI0 bands and sites of 35S and 5S rDNA in metaphase chromosomes. Seven out of 12 analysed species presented heteromorphic pairs regarding 35S rDNA and/or 5S rDNA. Hohenbergia thus shows karyotypic diversity despite the conservation in chromosome number.

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Reproductive systems and post-pollination barriers between two closely related eu-bromelioids (Bromeliaceae) in the Atlantic Forest of Brazil

Cavalcante

Souza

Williams

et al. 2019

Botanical Journal of the Linnean Society

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The eu-bromelioid clade provides a classic example of an exceptionally rapid radiation, in which many closely related species are found in sympatry. In this respect, species cohesion may be due to the rapid evolution of strong reproductive barriers, although interspecific and intergeneric hybridization is observed in the family. The objective of this study was to characterize the breeding systems and post-pollination reproductive barriers in Wittmackia patentissima and Hohenbergia ridleyi. Previously included in Aechmea, they show an almost complete absence of pre-pollination barriers, although their recent divergence may not have allowed time for complete ecological/reproductive isolation to have evolved. In manual pollinations, both species had > 40% fruit set in self and outcross treatments, but seed set from manual self-pollinations was < 50% that of outcrosses, and spontaneous self-pollination produced fewer than three seeds per fruit. Self-pollen and pollen tubes showed no evidence of self-incompatibility, but heterospecific pollen tubes were arrested in the lower part of the style and heterospecific seed set was zero in both species. The combination of self-compatibility and strong post-pollination, pre-fertilization reproductive barriers is consistent with the involvement of breeding system reproductive barriers in allowing closely related bromeliad species to occur in sympatry.

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A new species of Hohenbergia (Bromeliaceae) from the Atlantic Forest of Northeast Brazil

Abstract: Hohenbergia isepponae (Bromeliaceae), a new species from the Atlantic Forest of Pernambuco, Brazil is described and illustrated herewith. We also compared it with the morphologically similar species.

Cited by 3 publications

References 0 publications

Hohenbergia erecta (Bromeliaceae: Bromelioideae), a New Once-branched Species from Chapada Diamantina, Bahia State, Brazil

Hohenbergia erecta (Bromeliaceae: Bromelioideae), a New Once-branched Species from Chapada Diamantina, Bahia State, Brazil

Genome size and chromosome number conservation contrasting with karyotype diversity in Hohenbergia (Bromelioideae, Bromeliaceae)

Reproductive systems and post-pollination barriers between two closely related eu-bromelioids (Bromeliaceae) in the Atlantic Forest of Brazil

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