Affiliation:
1. Department of Botany and Zoology, Faculty of Science Masaryk University Kotlarska 2 611 37 Brno Czech Republic
2. Department of Biological Sciences University of Cape Town Cape Town 7700 South Africa
3. Royal Botanic Gardens, Kew Richmond TW9 3AE UK
4. UN Environment Programme World Conservation Monitoring Centre (UNEP‐WCMC) Cambridge CB3 0DL UK
Abstract
Summary
Angiosperms, which inhabit diverse environments across all continents, exhibit significant variation in genome sizes, making them an excellent model system for examining hypotheses about the global distribution of genome size. These include the previously proposed large genome constraint, mutational hazard, polyploidy‐mediated, and climate‐mediated hypotheses.
We compiled the largest genome size dataset to date, encompassing 16 017 (> 5% of known) angiosperm species, and analyzed genome size distribution using a comprehensive geographic distribution dataset for all angiosperms.
We observed that angiosperms with large range sizes generally had small genomes, supporting the large genome constraint hypothesis. Climate was shown to exert a strong influence on genome size distribution along the global latitudinal gradient, while the frequency of polyploidy and the type of growth form had negligible effects. In contrast to the unimodal patterns along the global latitudinal gradient shown by plant size traits and polyploid proportions, the increase in angiosperm genome size from the equator to 40–50°N/S is probably mediated by different (mostly climatic) mechanisms than the decrease in genome sizes observed from 40 to 50°N northward.
Our analysis suggests that the global distribution of genome sizes in angiosperms is mainly shaped by climatically mediated purifying selection, genetic drift, relaxed selection, and environmental filtering.
Funder
Grantová Agentura České Republiky
Reference144 articles.
1. Protists decrease in size linearly with temperature: ca. 2.5% degrees C(−1);Atkinson D;Proceedings of the Royal Society B: Biological Sciences,2003
2. Karyo‐systematische Untersuchungen der Familie Gramineen;Avdulov NP;Bulletin of Applied Botany, of Genetics and Plant Breeding, Leningrad,1931
3. Genome size is a strong predictor of cell size and stomatal density in angiosperms;Beaulieu JM;New Phytologist,2008
4. Correlated evolution of genome size and seed mass;Beaulieu JM;New Phytologist,2007
5. The nature of intraspecific and interspecific genome size variation in taxonomically complex eyebrights;Becher H;Annals of Botany,2021
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献