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. 2020 Sep 10;11:536507. doi: 10.3389/fpls.2020.536507

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Copyright © 2020 Burchardt, Buddenhagen, Gaeta, Souza, Marques and Vanzela

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Idiograms representing the physical mapping of C-CMA/DAPI banding in karyotypes of 12 species of Rhynchospora, including two data obtained from literature (Vanzela and Guerra, 2000), which are highlighted with * and **. Species are grouped in sections according to Kükenthal’s classification. In sect. Dichromena (A), five cytotypes exhibited polymorphisms in the banding location (indicated by red stars). Observe the large C-CMA/DAPI banding diversity among populations of R. nervosa. Only R. pubera and R. setigera showed regular distribution of bands. From the other two closest sections (Tenues and Spermodontes, (B, C), respectively), only R. riparia exhibited a regular band distribution. Rhynchospora tenuis (2n = 4 and 2n = 6) presents karyotypes completely involved in chromosome fusion (symploidy) and fission (agmatoploidy) and the other two, R. austrobasiliensis and R. tenerrima, showed part of their chromosomes with heteromorphisms.