Super-genotype: global monoclonality defies the odds of nature

Johannes J. Le Roux; Ania M. Wieczorek; Mark G. Wright; Carol T. Tran

doi:10.1371/journal.pone.0000590

Super-genotype: global monoclonality defies the odds of nature

Johannes J. Le Roux, Ania M. Wieczorek, Mark G. Wright, Carol T. Tran

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Abstract

The ability to respond to natural selection under novel conditions is critical for the establishment and persistence of introduced alien species and their ability to become invasive. Here we correlated neutral and quantitative genetic diversity of the weed Pennisetum setaceum Forsk. Chiov. (Poaceae) with differing global (North American and African) patterns of invasiveness and compared this diversity to native range populations. Numerous molecular markers indicate complete monoclonality within and among all of these areas (F_ST = 0.0) and is supported by extreme low quantitative trait variance (Q_ST = 0.00065-0.00952). The results support the general-purpose-genotype hypothesis that can tolerate all environmental variation. However, a single global genotype and widespread invasiveness under numerous environmental conditions suggests a super-genotype. The super-genotype described here likely evolved high levels of plasticity in response to fluctuating environmental conditions during the Early to Mid Holocene. During the Late Holocene, when environmental conditions were predominantly constant but extremely inclement, strong selection resulted in only a few surviving genotypes.

Original language	English
Article number	e0000590
Pages (from-to)	1-9
Number of pages	9
Journal	PLoS ONE
Volume	2
Issue number	7
DOIs	https://doi.org/10.1371/journal.pone.0000590
Publication status	Published - 4 Jul 2007
Externally published	Yes

Bibliographical note

Copyright the Author(s) 2007. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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Publisher version (open access)Final published version, 1.07 MBLicence: CC BY

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title = "Super-genotype: global monoclonality defies the odds of nature",

abstract = "The ability to respond to natural selection under novel conditions is critical for the establishment and persistence of introduced alien species and their ability to become invasive. Here we correlated neutral and quantitative genetic diversity of the weed Pennisetum setaceum Forsk. Chiov. (Poaceae) with differing global (North American and African) patterns of invasiveness and compared this diversity to native range populations. Numerous molecular markers indicate complete monoclonality within and among all of these areas (FST = 0.0) and is supported by extreme low quantitative trait variance (QST = 0.00065-0.00952). The results support the general-purpose-genotype hypothesis that can tolerate all environmental variation. However, a single global genotype and widespread invasiveness under numerous environmental conditions suggests a super-genotype. The super-genotype described here likely evolved high levels of plasticity in response to fluctuating environmental conditions during the Early to Mid Holocene. During the Late Holocene, when environmental conditions were predominantly constant but extremely inclement, strong selection resulted in only a few surviving genotypes.",

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AU - Wieczorek, Ania M.

AU - Wright, Mark G.

AU - Tran, Carol T.

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Super-genotype: global monoclonality defies the odds of nature

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