Chromosome number, heterochromatin and genome size support recent polyploid origin of the Epidendrum nocturnum group and reveal a new species (Laeliinae, Orchidaceae)

The Epidendrum nocturnum group comprises about 60 species. Nine species occur in Brazil, predominantly in the Atlantic and Amazon Forests. The group is taxonomically complex because its species are morphologically similar and not easily distinguished. The main objective of this work is to characterize their chromosome evolution and how this has affected species delimitation in Brazilian representatives of the E. nocturnum group. We used chromosome numbers, heterochromatin band patterns and genome size variation to better understand the chromosome variation, species delimitation and relationship among seven representatives of this group. A new species from Cerrado/Amazon rainforest ecotone is described based on cytological and morphological characters. The new species, Epidendrum pareciense, is a diploid (2n = 40), E. bahiense, E. carpophorum, E. micronocturnum, E. purpureocaulis and E. nocturnum are tetraploids (2n = 80), and E. tumuc-humaciense is hexaploid (2n = 120), the last a new ploidy for the group. Heterochromatin in these species is characterized by GC-rich regions (CMAThe accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author

An overview of the Brazilian inselberg genus Ameroglossum (Linderniaceae, Lamiales), with the description of seven new species

Field studies of the inselberg flora of north-eastern Brazil have resulted in the discovery of much greater morphological diversity of the genus Ameroglossum, than previously envisaged. These enigmatic plants are endemic to isolated rock outcrops, which have long been surrounded by unsuitable habitat. The morphological forms are geographically isolated and stable in cultivation when grown under similar conditions. We here provide detailed descriptions of the two previously known species and propose an additional seven new species in the genus. A taxonomic revision of the genus, including an identification key is provided. We hypothesize that the evolution of this genus is driven by the diversity of their hummingbird pollinators. Due to the threatened nature of inselberg habitats and the small populations found for most taxa, the species described here are likely to be under threat and in need for formal redlisting

IAPT chromosome data 33

Taxonomy: This study was supported by Agencia Nacional de Promoción Científica y Técnica (ANPCyT) grant no. PICT-2017-4203 and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and a postdoctoral fellowship from CONICET to AVR.Fil: Marhold, Karol. Slovak Academy of Sciences. Institute of Botany; Eslovaquia. Karlova Univerzita (cuni); República ChecaFil: Kucera, Jaromír. Slovak Academy of Sciences. Institute of Botany; EslovaquiaFil: Acuña, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; ArgentinaFil: Akopian, Janna A.. Armenian National Academy of Sciences; ArmeniaFil: de Almeida, Erton M.. Universidade Federal de Pernambuco; Brasil. Universidade Federal da Paraíba; BrasilFil: Alves, Marccus V.. Universidade Federal da Paraíba; BrasilFil: Amorim, Bruno. Museu da Amazônia; Brasil. Universidade do Estado do Amazona; BrasilFil: An'kova, Tatyana V.. Academia de Ciencias de Rusia; RusiaFil: Arora, Jaya. University of Delhi; IndiaFil: Aytaç, Zeki. Gazi Üniversitesi; TurquíaFil: Baez, Jesica Mariana. Universidade Federal de Pernambuco; Brasil. Leibniz Institute of Plant Genetics and Crop Plant Research; Alemania. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Cavalcanti, Taciana Barbosa. Parque Estação Biológica; BrasilFil: Calvente, Alice. Universidade de Sao Paulo; Brasil. Universidade Federal do Rio Grande do Norte; BrasilFil: Catalan, Pilar. Tomsk State University; Rusia. Universidad de Zaragoza; EspañaFil: Chernyagina, Olga A.. Academia de Ciencias de Rusia; RusiaFil: Chernysheva, Olga A.. Academia de Ciencias de Rusia; RusiaFil: Cordeiro, Joel M. P.. Universidade Estadual da Paraiba; BrasilFil: Daviña, Julio Rubén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas; ArgentinaFil: Deanna, Rocío. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas; Argentina. State University of Colorado at Boulder; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Delgado, Luis. Universidad de Salamanca; EspañaFil: Dias Silva, Yhanndra K.. Universidade Federal de Pernambuco; BrasilFil: Elliott, Tammy L.. University of Cape Town; Sudáfrica. University of Montreal; CanadáFil: Erst, Andrey S.. Tomsk State University; Rusia. Academia de Ciencias de Rusia; RusiaFil: Felix, Leonardo P.. Universidade Federal da Paraíba; BrasilFil: Forni Martins, Eliana R.. Universidade Estadual de Campinas; BrasilFil: Gallego, Francisca. Universidad de Salamanca; EspañaFil: Facco, Marlon Garlet. Universidade de Brasília; BrasilFil: Gianini Aquino, Analía Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas; ArgentinaFil: Gomes de Andrade, Maria J.. Universidade do Estado da Bahia; BrasilFil: Rua, Gabriel Hugo. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Recursos Naturales y Ambiente. Cátedra de Botánica Agrícola; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin