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Revealed by Chromosome Mapping of Rdna Loci RESEARCH ARTICLE Karyotype heterogeneity in Philodendron s.l. (Araceae) revealed by chromosome mapping of rDNA loci 1 2 3,4 Emanuelle Varão VasconcelosID , Santelmo Vasconcelos , Tiago Ribeiro , Ana Maria Benko-Iseppon1, Ana Christina Brasileiro-Vidal1* 1 Departamento de GeneÂtica, Centro de Biociências, Universidade Federal de Pernambuco, CEP, Recife, Pernambuco, Brazil, 2 Instituto TecnoloÂgico Vale, CEP, BeleÂm, ParaÂ, Brazil, 3 Departamento de BotaÃnica, Centro de Biociências, Universidade Federal de Pernambuco, CEP, Recife, Pernambuco, Brazil, 4 Instituto Federal de Mato Grosso, Campus AvancËado de Diamantino, Rodovia Roberto Campos, CEP, Diamantino, a1111111111 Mato Grosso, Brazil a1111111111 a1111111111 * [email protected] a1111111111 a1111111111 Abstract Philodendron s.l. (Araceae) has been recently focus of taxonomic and phylogenetic studies, but karyotypic data are limited to chromosome numbers and a few published genome sizes. OPEN ACCESS In this work, karyotypes of 34 species of Philodendron s.l. (29 species of Philodendron and Citation: Vasconcelos EV, Vasconcelos S, Ribeiro five of Thaumatophyllum), ranging from 2n = 28 to 36 chromosomes, were analyzed by fluo- T, Benko-Iseppon AM, Brasileiro-Vidal AC (2018) Karyotype heterogeneity in Philodendron s.l. rescence in situ hybridization (FISH) with rDNA and telomeric probes, aiming to understand (Araceae) revealed by chromosome mapping of the evolution of the karyotype diversity of the group. Philodendron presented a high number rDNA loci. PLoS ONE 13(11): e0207318. https:// variation of 35S rDNA, ranging from two to 16 sites, which were mostly in the terminal region doi.org/10.1371/journal.pone.0207318 of the short arms, with nine species presenting heteromorphisms. In the case of Thaumato- Editor: Arthur J. Lustig, Tulane University Health phyllum species, we observed a considerably lower variation, which ranged from two to four Sciences Center, UNITED STATES terminal sites. The distribution of the 5S rDNA clusters was more conserved, with two sites Received: August 3, 2018 for most species, being preferably located interstitially in the long chromosome arms. For Accepted: October 29, 2018 the telomeric probe, while exclusively terminal sites were observed for P. giganteum (2n = Published: November 15, 2018 30) chromosomes, P. callosum (2n = 28) presented an interstitial distribution associated with satellite DNA. rDNA sites of the analyzed species of Philodendron s.l. species were ran- Copyright: © 2018 Vasconcelos et al. This is an open access article distributed under the terms of domly distributed considering the phylogenetic context, probably due to rapid evolution and the Creative Commons Attribution License, which great diversity of these genomes. The observed heteromorphisms suggest the accumula- permits unrestricted use, distribution, and tion of repetitive DNA in the genomes of some species and the occurrence of chromosomal reproduction in any medium, provided the original author and source are credited. rearrangements along the karyotype evolution of the group. Data Availability Statement: All relevant data are within the manuscript and its Supporting Information files. Funding: This work was financially supported by fellowships from CNPq (National Council for Introduction Scientific and Technological Development), CAPES Araceae (ca. 3600 species) is a widely distributed monocot family with high ecological diver- (Coordination of Higher Level Personnel), and FACEPE (Foundation for Support to Science and sity, occurring mainly in tropical regions [1, 2]. Philodendron s.l. is the second largest group Technology of the State of Pernambuco). The within the family (ca. 500 species), presenting a wide Neotropical distribution, with the Ama- funders had no role in study design, data collection zon region as its probable center of origin [2±4]. The genus was traditionally divided into PLOS ONE | https://doi.org/10.1371/journal.pone.0207318 November 15, 2018 1 / 15 Karyotype diversity in Philodendron s.l. and analysis, decision to publish, or preparation of three monophyletic subgenera: P. subg. Meconostigma (now recognized as the genus Thauma- the manuscript. tophyllum, with 21 species), mostly with the diploid number 2n = 36; P. subg. Pteromischum Competing interests: The authors have declared (82 species), with chromosome counts only for two species (both with 2n = 32); and P. subg. that no competing interests exist. Philodendron (ca. 400 species), as the most morphologically diverse group, with chromosome number ranging from 2n = 26 to 40 chromosomes, although 2n = 32 and 34 have been reported as the most common numbers [5±10]. It is suggested that x = 16 is the basic number for Philodendron s.l. (including Thaumatophyllum) and that the karyotype evolution of the group has been driven by both ascending and descending dysploidy events, since no poly- ploidy was reported so far [8, 9]. The ribosomal RNA (rRNA) genes have been physically mapped in the chromosome of species of several plant groups [11±13], being useful for understanding the general patterns of karyotype evolution among related species and for cytotaxonomic approaches [14±16]. In Ara- ceae, studies involving the physical location of 5S and 35S rDNA by FISH (Fluorescent In Situ Hybridization) are available for just a few species, including 10 species of Typhonium [17] and 17 other species from different groups, such as P. hederaceum (Jacq.) Schott (as P. scandens Koch & Sello), two species of Anthurium, three species of Spathiphyllum and two species of Ulearum [18, 19]. Overall, all analyzed species presented only one pair of 5S rDNA sites, located in the subterminal or interstitial regions, whereas for 35S rDNA there was a predomi- nance of four terminal sites, with few exceptions. Thus, based on the chromosome number and genome size variation previously mentioned for Philodendron and Thaumatophyllum [8, 9, 20], we have addressed the following questions: (I) Is the distribution of rDNA sites in Philodendron and the sister genus Thaumatophyllum conserved? (II) Does the distribution pattern of rDNA sites agree with the available phyloge- netic data? To answer these questions, molecular cytogenetic data were generated for the first time for 29 Philodendron and five Thaumatophyllum species by FISH with rDNA and telo- meric probes. In addition, these data were plotted in a recently published phylogenetic tree of the group [21], aiming to better understand the patterns of karyotype evolution of both genera. Materials and methods Plant material and chromosomal preparations Thirty-four species were analyzed by FISH. Sixteen species were sampled from the living col- lection kept at the Royal Botanic Gardens, Kew (Richmond, United Kingdom), and 18 were collected in different regions of Brazil, as licensed by the Brazilian authorities (ICMBio license numbers 14311±2 and 31038±4). The collected Brazilian plants are being cultivated in the liv- ing collection of the Laboratory of Plant Genetics and Biotechnology, Department of Genetics, UFPE (Recife, Brazil). The provenance of the plants and accession numbers are shown in Table 1. Root tips were pretreated in 2 mM 8-hydroxyquinoline at 8ÊC for 24 h, fixed in Carnoy solution (ethanol:acetic acid, 3:1, v/v) at room temperature for 24 h, and stored at -20ÊC. Sub- sequently, the fixed root tips were washed in distilled water and digested in an enzyme solution containing 2% cellulase (w/v) (Onozuka R-10, Serva) and 20% pectinase (v/v) (Sigma-Aldrich) overnight at 37ÊC. Slides were prepared by squashing the meristematic tissue in 45% acetic acid. In addition, slides were stained in a solution of 2 μg mL-1 DAPI (4', 6-diamidino-2-phe- nylindole) and glycerol (1:1, v/v) and then analyzed. Afterwards, the best slides were de-stained and fixed in Carnoy solution for 30 min and transferred to absolute ethanol for 1 h, both at room temperature. After air drying, the slides were stored at -20ÊC. At least five root tips were analyzed per species. PLOS ONE | https://doi.org/10.1371/journal.pone.0207318 November 15, 2018 2 / 15 Karyotype diversity in Philodendron s.l. Table 1. Species of Philodendron and Thaumatophyllum with their respective section and accession, chromosome complement size, chromosome range size, diploid number and number of rDNA sites. Genus Section Species Provenance and accession number 2n Number of rDNA sites 35S 5S Thaumatophyllum T. corcovadense (Kunth) Sakur., Calazans & Mayo Taquaritinga do Norte, Pernambuco, Brazil; Cultivated 36 4 2 at LGBV; SV314 T. lundii (Warm.) Sakur., Calazans & Mayo Morro do ChapeÂu, Bahia, Brazil; cultivated at LGBV; 36 2 2 SV089 T. mello-barretoanum (Burle-Marx ex G.M. Barroso) Recife, Pernambuco, Brazil; Cultivated at LGBV; 34 2 2 Sakur., Calazans & Mayo SV534 T. saxicola (Krause) Sakur., Calazans & Mayo Mucugê, Bahia, Brazil; Cultivated at LGBV; SV539 36 2 2 T. spruceanum Schott Reserva Florestal Adolpho Ducke, Amazonas, Brazil; 32 4 2 Cultivated at LGBV; SV063 Philodendron Baursia P. callosum K.Krause Presidente Figueiredo, Amazonas, Brazil; 28 - - subg. Cultivated at LGBV; SV022 Philodendron P. glaziovii Hook.f. Pedra Azul, EspõÂrito Santo, Brazil; 34 6 2 Cultivated at RBG Kew/ 1983±2011 P. renauxii Reitz Itapema, Santa Catarina, Brazil; 34 8 2 Cultivated at RBG Kew/ 1983±1988 Macrobelium P. annulatum Croat Cerro Jefe, PanamaÂ; 32 2 2 Cultivated at RBG Kew/ 1996±4421 P. barrosoanum G.S.Bunting Reserva Florestal Adolpho Ducke, Amazonas, Brazil; 32 8 2 Cultivated at LGBV; MC107 P. burle-marxii G.M.Barroso Amazonas region, Colombia; 34 10 2 Cultivated at RGB Kew/ 1975±98 P. eximium Schott Taquaritinga do Norte, Pernambuco, Brazil; Cultivated 32 6 2 at LGBV; SV293 P. inconcinnum Schott Cultivated at RBG Kew/ 1981±3728 32 2 2 P. krugii Engl. Trinidad and Tobago; Cultivated at RBG Kew/ 1980± 34 2 2 1645 P. quinquenervium Schott Uatumã, Amazonas, Brazil; Cultivated at LGBV; SV076 32 15 2 P. smithii Engl. Tabasco, Mexico; Cultivated at RBG Kew/ 1980±1583 32 8 2 P. uleanum Engl. Napo, Ecuador; Cultivated at RGB Kew/ 1982±1568 34 12 2 Philodendron P. billietiae Croat Cultivated at RBG Kew/ 2005±2363 32 16 2 P. fragrantissimum (Hook.) G.Don Igarassu, Pernambuco, Brazil; Cultivated at LGBV; 32 2 2 SV295 P.
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