Karyotype analysis in Bignonieae (Bignoniaceae): chromosome numbers and heterochromatin

Cordeiro, Joel Maciel Pereira; Kaehler, Miriam; Souza, Gustavo; Félix, Leonardo P.

doi:10.1590/0001-3765201720170363

Cited by 5 publications

(16 citation statements)

References 29 publications

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“…Reported chromosome numbers suggest that polyploidy is restricted to the clades Tabebuia alliance and Bignonieae (Goldblatt and Gentry, 1979;Piazzano, 1998;Firetti-Leggieri et al, 2011, 2013Cordeiro et al, 2017). Reproductive analyses of Handroanthus and Anemopaegma Mart.…”

Section: Discussionmentioning

confidence: 99%

“…The samples were aged for three days at room temperature and stained with 10 mL of CMA (0.1 mg/mL) for 1 h, and then with 10 mL of DAPI (1 mg/mL) for 30 min. The samples were mounted in glycerol/McIlvaine's buffer at pH 7.0 (1:1, v/v) and kept in the dark for three days (Cordeiro et al, 2017).…”

Section: Cytogenetic Analysesmentioning

confidence: 99%

“…Information concerning heterochromatin patterns is presented for Bignonieae, Tabebuia alliance, Tecomeae, and Jacarandeae. The chromosomes types (A, B, C, D, E and F) follow Cordeiro et al (2017).…”

Section: Base Chromosome Number and Karyotype Evolutionmentioning

confidence: 99%

“…The different patterns found can help determine taxonomic distinctions and clarify relationships among species (Carvalho et al, 2005;Almeida et al, 2007;Oliveira et al, 2015), as well as contribute to the description of new taxa, such as Epidendrum sanchezii E.Pessoa & L.P.Felix (Pessoa et al, 2014), Ameroglossum manoel-felixii L.P.Felix & E.M.Almeida (Almeida et al, 2016), and Spondias bahiensis P.Carvalho, Van den Berg and M.Machado (Almeida et al, 2007;Machado et al, 2015). Preliminary studies in the tribe Jacarandeae (Cordeiro et al, 2016b) indicated that heterochromatin distribution appeared to follow a specific pattern (8-16 CMA + terminal bands), while in the tribe Bignonieae (Cordeiro et al, 2017) heterochromatin distribution is quite variable among the species. That result demonstrates that regions rich in GC base pairs (CMA + ) can be variable even among closely related species of Bignoniaceae, and that a specific pattern for each group or tribe may not exist.…”

Section: Introductionmentioning

confidence: 99%

“…Chromosome numbers and morphologies are the features most used in karyotype analyses and ground cytotaxonomy studies (Guerra, 2008), although those characters can be uninformative in groups where chromosome numbers are stable and the chromosomes are small (< 3 mm) (Guerra, 2000(Guerra, , 2012. Bignoniaceae have chromosome sizes of~2 mm, meta-submetacentric morphology, and 2n = 36 or 40 is predominant in the majority of species (Goldblatt and Gentry, 1979;Piazzano et al, 2015;Cordeiro et al, 2016bCordeiro et al, , 2017. Banding pattern characterizations can therefore often help discriminate between cytotypes with stable chromosome numbers, sizes and morphologies.…”

Section: Introductionmentioning

confidence: 99%

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Heterochromatin and numeric chromosome evolution in Bignoniaceae, with emphasis on the Neotropical clade Tabebuia alliance

et al. 2020

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Bignoniaceae is a diverse family composed of 840 species with Pantropical distribution. The chromosome number 2n = 40 is predominant in most species of the family, with n = 20 formerly being considered the haploid base number. We discuss here the haploid base number of Bignoniaceae and examine heterochromatin distributions revealed by CMA/DAPI fluorochromes in the Tabebuia alliance, as well as in some species of the Bignonieae, Tecomeae, and Jacarandeae tribes. When comparing the chromosome records and the phylogenies of Bignoniaceae it can be deduced that the base number of Bignoniaceae is probably n = 18, followed by an ascendant dysploidy (n = 18 ® n = 20) in the most derived and diverse clades. The predominant heterochromatin banding patterns in the Tabebuia alliance were found to be two terminal CMA + bands or two terminal and two proximal CMA + bands. The banding pattern in the Tabebuia alliance clade was more variable than seen in Jacarandeae, but less variable than Bignonieae. Despite the intermediate level of variation observed, heterochromatin banding patterns offer a promising tool for distinguishing species, especially in the morphologically complex genus Handroanthus.

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Section: Discussionmentioning

confidence: 99%

Section: Cytogenetic Analysesmentioning

confidence: 99%

Section: Base Chromosome Number and Karyotype Evolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heterochromatin and numeric chromosome evolution in Bignoniaceae, with emphasis on the Neotropical clade Tabebuia alliance

et al. 2020

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Fine tuning the circumscription of Fridericia (Bignonieae, Bignoniaceae)

Kaehler

Michelangeli

Lohmann

2019

TAXON

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The plant family Bignoniaceae has a complicated history of supra-specific level systematics. In the past decade, molecular phylogenetic studies have contributed substantially to an improved circumscription of clades at all taxonomic levels, especially at the generic and tribal levels. For instance, a molecular phylogeny of the tribe Bignonieae reconstructed a polyphyletic Arrabidaea, and proposed a new circumscription for members of the Arrabidaea & Allies clade. Within this new classification, most species previously included in Arrabidaea were distributed among four genera: Cuspidaria (19 spp.), Fridericia (67 spp.), Tanaecium (17 spp.), and Xylophragma (7 spp.). The taxonomy of Fridericia, the genus that received most species of Arrabidaea, remains complicated due to the high morphological variability and broad distribution of its species. Here, we used molecular data and a broad sampling of taxa within the Arrabidaea & Allies clade to reconstruct the phylogeny of Fridericia. We then studied the morphology of all species of Fridericia and identified morphological synapomorphies that characterize major clades that represent meaningful units for future taxonomic studies. Most genera included in the Arrabidaea & Allies clade were retrieved as monophyletic; however, two species of Fridericia were reconstructed within Cuspidaria, while three species of Fridericia were placed within Tanaecium. The molecular phylogenetic placements received additional support from morphology, and the necessary taxonomic changes are proposed. We combine three species of Fridericia into Tanaecium (T. dichotomum comb. nov., T. paradoxum comb. nov., T. parviflorum comb. nov.), two species into Xylophragma (X. claussenii comb. nov., X. corchoroides comb. nov.), two species into Cuspidaria (C. bracteolata comb. nov., C. monophylla comb. nov.), and one species of Adenocalymma into Fridericia (F. trichoclada comb. nov.). We also synonymize Fridericia whitei into Cuspidaria pulchra. We present a key for the seven main clades identified within the genus, as well as a detailed morphological description for Fridericia and its major lineages.

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Post pollination events in a self-sterile hexaploid monoembryonic lineage of Handroanthus serratifolius (Vahl) S. Grose (Bignoniaceae)

et al. 2019

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In diploid late-acting self-incompatible (LSI) species of Bignoniaceae, self-pollinated pistils show a marked delay in ovule penetration by pollen tubes, followed by delayed, but otherwise normal, initial stages of endosperm development and subsequent pistil abscission. Most polyploid species of Bignoniaceae are apomictic and set selfed fruits with viable polyembryonic seeds carrying adventitious embryos. Handroanthus serratifolius is a polyploid species with sporophytic apomictic individuals that produce polyembryonic seeds after either self-or cross-pollination, and other LSI individuals that produce exclusively monoembryionic seeds. Our aim was to determine whether self-sterility events in the latter are similar to those observed in other diploid LSI species of Bignoniaceae. No conspicuous differences in the progress of ovule penetration, fertilization and early stages of endosperm development were observed between selfed and crossed pistils, which contrasts with the marked delay observed in these events after self-pollination in diploid LSI species of the family. Adventitious embryo precursor cells (AEPs) were observed in some ovules, but they apparently do not develop into embryos. We believe that the AEPs in these plants represent a 'potential' for sporophytic apomixis, which would explain the similar behaviour of post-pollination events in selfed vs. crossed pistils despite their inability to set fruits after selfing.

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Karyotype analysis in Bignonieae (Bignoniaceae): chromosome numbers and heterochromatin

Cited by 5 publications

References 29 publications

Heterochromatin and numeric chromosome evolution in Bignoniaceae, with emphasis on the Neotropical clade Tabebuia alliance

Heterochromatin and numeric chromosome evolution in Bignoniaceae, with emphasis on the Neotropical clade Tabebuia alliance

Fine tuning the circumscription of Fridericia (Bignonieae, Bignoniaceae)

Post pollination events in a self-sterile hexaploid monoembryonic lineage of Handroanthus serratifolius (Vahl) S. Grose (Bignoniaceae)

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