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Genome size variation and endopolyploidy in the diverse succulent plant family Aizoaceae

Lookup NU author(s): Dr Maxim KapralovORCiD


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© 2020 The Linnean Society of London. Aizoaceae are one of the most diverse succulent plant families in the world, with c. 2 400 species, and they are a major component of the Greater Cape Floristic Region of South Africa. Despite this diversity, genome size (GS) has only been recorded in three of the c. 144 genera of Aizoaceae. This study provides the first comprehensive assessment of GS in the family with 109 genera measured (76% of genera). GS (2C) is conserved in Aizoaceae, varying from 0.54 to 6.34 pg (0.53-6.20 Gbp), with a mean of 2.6 pg. No significant differences between GS and the ecological and environmental traits tested were recovered. Infrageneric GS was explored in the most diverse stoneplant genus, Conophytum, and was found to be extremely conserved [0.98-2.24 pg (1C)]. Furthermore, the extent of endoreduplication in Conophytum was determined across 46 species. Leaf and flower tissues of Conophytum are highly polysomatic and ploidy states of 2C-64C were typically observed across the genus, with some instances of 128C. The relatively conserved and small GS measured across Aizoaceae and in Conophytum is possibly linked to the recent and rapid radiation of the family.

Publication metadata

Author(s): Powell RF, Pulido Suarez L, Magee AR, Boatwright JS, Kapralov MV, Young AJ

Publication type: Article

Publication status: Published

Journal: Botanical Journal of the Linnean Society

Year: 2020

Volume: 194

Issue: 1

Pages: 47-68

Print publication date: 01/09/2020

Online publication date: 18/06/2020

Acceptance date: 04/05/2020

ISSN (print): 0024-4074

ISSN (electronic): 1095-8339

Publisher: Oxford University Press


DOI: 10.1093/botlinnean/boaa034


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