Chromosome number of Orthophytum species (Bromeliaceae)

Louzada, Rafael Batista; Palma‐Silva, Clarisse; Corrêa, Andréa Macêdo; Kaltchuk-Santos, Eliane; Wanderley, Maria das Graças Lapa

doi:10.1007/s12225-010-9175-6

Cited by 19 publications

(10 citation statements)

References 13 publications

(25 reference statements)

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“…Variation in hydrological habitat position for Orthophytum species was consistent with the suggestion of Louzada et al (2010) that species in the derived polyploid lineage occur in more xeric environments than earlier-diverging diploid Orthophytum species (for full results see Supporting Information—Table S1 ). Polyploidization can have dramatic effects on plant–environment interactions ( Levin 1983 ; Baker et al 2017 ; Donkpegan et al 2017 ), and Paule et al (2017) have recently demonstrated that its occurrence in Fosterella was associated with a shift in temperature niche.…”

Section: Discussionsupporting

confidence: 83%

Geography, environment and organismal traits in the diversification of a major tropical herbaceous angiosperm radiation

Males

2018

AoB PLANTS

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The terrestrial bromeliads are a diverse group of plants native to the Americas. In this article, the distributions of 564 species are analysed to answer key questions about plant–environment interactions. Contrasting biological characteristics can explain the occurrence of different species in different climatic zones, and species native to arid zones appear to be particularly specialized. Species which are more tolerant of a range of climates tend to occur across larger geographical ranges, and closely related species in large genera tend to show differentiation in their climatic preferences.

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Section: Discussionsupporting

confidence: 83%

Geography, environment and organismal traits in the diversification of a major tropical herbaceous angiosperm radiation

Males

2018

AoB PLANTS

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“…Such an infrageneric ploidy diversification pattern has also been reported in Orthophytum , in which the polyploid species are closely associated with xeric microhabitats and possess xeromorphic traits (e.g. coriaceous, densely lepidote leaves), whereas the majority of diploid taxa are found in more mesic to wet microhabitats (Louzada et al ., ). The higher general number of heterozygous alleles in polyploids compared with their diploid progenitors may contribute to a higher physiological plasticity and the development of new morphological features, and thus can increase the tolerance to harsh environmental conditions (Levin, ).…”

Section: Discussionmentioning

confidence: 99%

Chromosome numbers and DNA content in Bromeliaceae: additional data and critical review

et al. 2014

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For the large Neotropical plant family Bromeliaceae, we provide new data on chromosome numbers, cytological features and genome size estimations, and combine them with data available in the literature. Root‐tip chromosome counts for 46 species representing four subfamilies and a literature review of previously published data were carried out. Propidium iodide staining and flow cytometry were used to estimate absolute genome sizes in five subfamilies of Bromeliaceae, sampling 28 species. Most species were diploid with 2n = 50 in Bromelioideae, Puyoideae and Pitcairnioideae, followed by 2n = 48 observed mainly in Tillandsioideae. Individual chromosome sizes varied more than tenfold, with the largest chromosomes observed in Tillandsioideae and the smallest in Bromelioideae. Genome sizes (2C‐values) varied from 0.85 to 2.23 pg, with the largest genomes in Tillandsioideae. Genome evolution in Bromeliaceae relies on two main mechanisms: polyploidy and dysploidy. With the exception of Tillandsioideae, polyploidy is positively correlated with genome size. Dysploidy is suggested as the mechanism responsible for the generation of the derived chromosome numbers, such as 2n = 32/34 or 2n = 48. The occurrence of B chromosomes in the dysploid genus Cryptanthus suggests ongoing speciation processes closely associated with chromosome rearrangements. © 2014 The Linnean Society of London, Botanical Journal of the Linnean Society, 2014, 176, 349–368.

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“…In regard to chromosome number, Marchant (1967);Cotias-de-Oliveira et al (2000), and Louzada et al (2010) related that most Bromeliaceae species possess 2n = 50 chromosomes. However, cytogenetic studies have shown variations concerning chromosome numbers, such as 2n = 34 for the genus Cryptanthus (Marchant 1967;Ramírez-Morillo and Brown 2001;Ceita et al 2008); 2n = 100 for Orthophytum amoenum (Ule) L. B. Smith (Bellintani et al 2005), Orthophytum albopictum Philcox (Cotias- de-Oliveira et al 2004;Louzada et al 2010), Neoglaziovia variegata (Arruda Câmara) (Cotiasde-Oliveira et al 2004), and Orthophytum burle-marxii L. B. Sm. and Read; 2n = 150 for Orthophytum maracasense L. B. Smith; and occurrence of B chromosomes in Bromelia plumieri (E. Morren) L. B. Smith, Cryptanthus bahianus L. B. Smith, and Hohenbergia aff.…”

Section: Introductionmentioning

confidence: 99%

Genome size and base composition of Bromeliaceae species assessed by flow cytometry

et al. 2012

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Flow cytometry (FCM) has been used to estimate the nuclear DNA content of Bromeliaceae species, which constitutes relevant information for studies of taxonomy, evolution, genetic diversity, and reproductive biology in bromeliads. Nevertheless, C values have only been estimated for 58 out of the 3,140 existing Bromeliaceae species. Aiming to contribute to the genome database of Bromeliaceae, the current study was carried out to measure the nuclear DNA content and base composition of Bromelioideae and Tillandsioideae species occurring in the Atlantic Rainforest. The most adequate FCM procedure provided histograms exhibiting G 0 /G 1 peaks with coefficients of variation below 5%, so that these histograms were used to measure the mean 2C and AT% values for all collected Bromelioideae and Tillandsioideae species. These values were statistically compared, and dendrograms were plotted. A second comparison was performed among all mean 2C values reported for Pitcairnioideae, Tillandsioideae, and Bromelioideae species. In accordance with previous statistical comparisons, two groups were formed: cluster 1, composed by Tillandsia loliacea, Tillandsia usneoides, and Tillandsia cyanea, and cluster 2, gathering other 69 species. Based on these results, we concluded that FCM was a rapid, accurate, and reliable technique to assess genome size and base composition. Furthermore, the FCM data reported here will contribute to the Monocot and Bromeliaceae database, which still displays several ongoing gaps, especially for endemic species.

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Chromosome number of Orthophytum species (Bromeliaceae)

Cited by 19 publications

References 13 publications

Geography, environment and organismal traits in the diversification of a major tropical herbaceous angiosperm radiation

Geography, environment and organismal traits in the diversification of a major tropical herbaceous angiosperm radiation

Chromosome numbers and DNA content in Bromeliaceae: additional data and critical review

Genome size and base composition of Bromeliaceae species assessed by flow cytometry

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