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A role for nonadaptive processes in plant genome size evolution?
Evolution 2010; 64(7):2097-109E

Abstract

Genome sizes vary widely among species, but comprehensive explanations for the emergence of this variation have not been validated. Lynch and Conery (2003) hypothesized that genome expansion is maladaptive, and that lineages with small effective population size (N(e)) evolve larger genomes than those with large N(e) as a consequence of the lowered efficacy of natural selection in small populations. In addition, mating systems likely affect genome size evolution via effects on both N(e) and the spread of transposable elements (TEs). We present a comparative analysis of the effects of N(e) and mating system on genome size evolution in seed plants. The dataset includes 205 species with monoploid genome size estimates (corrected for recent polyploidy) ranging from 2Cx = 0.3 to 65.9 pg. The raw data exhibited a strong positive relationship between outcrossing and genome size, a negative relationship between N(e) and genome size, but no detectable N(e)x outcrossing interaction. In contrast, phylogenetically independent contrast analyses found only a weak relationship between outcrossing and genome size and no relationship between N(e) and genome size. Thus, seed plants do not support the Lynch and Conery mechanism of genome size evolution. Further work is needed to disentangle contrasting effects of mating systems on the efficacy of selection and TE transmission.

Authors+Show Affiliations

Department of Ecology and Evolutionary Biology, Rice University, 6100 Main St., Houston, Texas 77005, USA. kwhitney@rice.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

20148953

Citation

Whitney, Kenneth D., et al. "A Role for Nonadaptive Processes in Plant Genome Size Evolution?" Evolution; International Journal of Organic Evolution, vol. 64, no. 7, 2010, pp. 2097-109.
Whitney KD, Baack EJ, Hamrick JL, et al. A role for nonadaptive processes in plant genome size evolution? Evolution. 2010;64(7):2097-109.
Whitney, K. D., Baack, E. J., Hamrick, J. L., Godt, M. J., Barringer, B. C., Bennett, M. D., ... Ross-Ibarra, J. (2010). A role for nonadaptive processes in plant genome size evolution? Evolution; International Journal of Organic Evolution, 64(7), pp. 2097-109. doi:10.1111/j.1558-5646.2010.00967.x.
Whitney KD, et al. A Role for Nonadaptive Processes in Plant Genome Size Evolution. Evolution. 2010;64(7):2097-109. PubMed PMID: 20148953.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A role for nonadaptive processes in plant genome size evolution? AU - Whitney,Kenneth D, AU - Baack,Eric J, AU - Hamrick,James L, AU - Godt,Mary Jo W, AU - Barringer,Brian C, AU - Bennett,Michael D, AU - Eckert,Christopher G, AU - Goodwillie,Carol, AU - Kalisz,Susan, AU - Leitch,Ilia J, AU - Ross-Ibarra,Jeffrey, Y1 - 2010/02/09/ PY - 2010/2/13/entrez PY - 2010/2/13/pubmed PY - 2010/11/17/medline SP - 2097 EP - 109 JF - Evolution; international journal of organic evolution JO - Evolution VL - 64 IS - 7 N2 - Genome sizes vary widely among species, but comprehensive explanations for the emergence of this variation have not been validated. Lynch and Conery (2003) hypothesized that genome expansion is maladaptive, and that lineages with small effective population size (N(e)) evolve larger genomes than those with large N(e) as a consequence of the lowered efficacy of natural selection in small populations. In addition, mating systems likely affect genome size evolution via effects on both N(e) and the spread of transposable elements (TEs). We present a comparative analysis of the effects of N(e) and mating system on genome size evolution in seed plants. The dataset includes 205 species with monoploid genome size estimates (corrected for recent polyploidy) ranging from 2Cx = 0.3 to 65.9 pg. The raw data exhibited a strong positive relationship between outcrossing and genome size, a negative relationship between N(e) and genome size, but no detectable N(e)x outcrossing interaction. In contrast, phylogenetically independent contrast analyses found only a weak relationship between outcrossing and genome size and no relationship between N(e) and genome size. Thus, seed plants do not support the Lynch and Conery mechanism of genome size evolution. Further work is needed to disentangle contrasting effects of mating systems on the efficacy of selection and TE transmission. SN - 1558-5646 UR - https://www.unboundmedicine.com/medline/citation/20148953/A_role_for_nonadaptive_processes_in_plant_genome_size_evolution L2 - https://doi.org/10.1111/j.1558-5646.2010.00967.x DB - PRIME DP - Unbound Medicine ER -