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. 2019 Oct 22;19:438. doi: 10.1186/s12870-019-2030-5

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — a Giemsa preparation in gray-scale of a somatic cell of Hybrid 5 (6x T. ambiguum x 2x T. occidentale) showing 2n = 4x = 32 chromosomes. Four NOR chromosomes are identified by dotted lines. b Giemsa preparation in grey scale of a somatic cell of an open-pollinated (OP) progeny plant of hybrid 5 (Hybrid 5OP-1). There are 2n = 48 chromosomes. Five NOR chromosomes are identified by arrows (main bodies) and arrowheads (satellites)