Down, then up: non-parallel genome size changes and a descending chromosome series in a recent radiation of the Australian allotetraploid plant species, Nicotiana section Suaveolentes (Solanaceae).

Autor: Chase MW; Royal Botanic Gardens, Kew, Richmond TW9 3DS, UK.; Department of Environment and Agriculture, Curtin University, Perth, Western Australia, Australia.; Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, A-1030 Vienna, Austria., Samuel R; Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, A-1030 Vienna, Austria., Leitch AR; School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK., Guignard MS; Royal Botanic Gardens, Kew, Richmond TW9 3DS, UK., Conran JG; ACEBB & SGC, School of Biological Sciences, The University of Adelaide, SA 5005Australia., Nollet F; Universidade Federal Rural de Pernambuco, Centro de Ciências Biológicas, Departamento de Botânica, Rua Manuel de Medeiros, S/N, Dois Irmãos, 52171-900 Recife, Pernambuco, Brazil., Fletcher P; School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK., Jakob A; Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, A-1030 Vienna, Austria., Cauz-Santos LA; Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, A-1030 Vienna, Austria., Vignolle G; Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, A-1030 Vienna, Austria., Dodsworth S; School of Biological Sciences, University of Portsmouth, Portsmouth PO1 2DY, UK., Christenhusz MJM; Department of Environment and Agriculture, Curtin University, Perth, Western Australia, Australia., Buril MT; ACEBB & SGC, School of Biological Sciences, The University of Adelaide, SA 5005Australia., Paun O; Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, A-1030 Vienna, Austria.
Jazyk: angličtina
Zdroj: Annals of botany [Ann Bot] 2023 Feb 07; Vol. 131 (1), pp. 123-142.
DOI: 10.1093/aob/mcac006
Abstrakt: Background and Aims: The extent to which genome size and chromosome numbers evolve in concert is little understood, particularly after polyploidy (whole-genome duplication), when a genome returns to a diploid-like condition (diploidization). We study this phenomenon in 46 species of allotetraploid Nicotiana section Suaveolentes (Solanaceae), which formed <6 million years ago and radiated in the arid centre of Australia.
Methods: We analysed newly assessed genome sizes and chromosome numbers within the context of a restriction site-associated nuclear DNA (RADseq) phylogenetic framework.
Key Results: RADseq generated a well-supported phylogenetic tree, in which multiple accessions from each species formed unique genetic clusters. Chromosome numbers and genome sizes vary from n = 2x = 15 to 24 and 2.7 to 5.8 pg/1C nucleus, respectively. Decreases in both genome size and chromosome number occur, although neither consistently nor in parallel. Species with the lowest chromosome numbers (n = 15-18) do not possess the smallest genome sizes and, although N. heterantha has retained the ancestral chromosome complement, n = 2x = 24, it nonetheless has the smallest genome size, even smaller than that of the modern representatives of ancestral diploids.
Conclusions: The results indicate that decreases in genome size and chromosome number occur in parallel down to a chromosome number threshold, n = 20, below which genome size increases, a phenomenon potentially explained by decreasing rates of recombination over fewer chromosomes. We hypothesize that, more generally in plants, major decreases in genome size post-polyploidization take place while chromosome numbers are still high because in these stages elimination of retrotransposons and other repetitive elements is more efficient. Once such major genome size change has been accomplished, then dysploid chromosome reductions take place to reorganize these smaller genomes, producing species with small genomes and low chromosome numbers such as those observed in many annual angiosperms, including Arabidopsis.
(© The Author(s) 2022. Published by Oxford University Press on behalf of the Annals of Botany Company.)
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje