1 May 2009 Quantitative Genetic Variation in Populations of Amsinckia spectabilis That Differ in Rate of Self-Fertilization
Magdalena P. Bartkowska, Mark O. Johnston
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Self-fertilization is expected to reduce genetic diversity within populations and consequently to limit adaptability to changing environments. Little is known, however, about the way the evolution of self-fertilization changes the amount or pattern of the components of genetic variation in natural populations. In this study, a reciprocal North Carolina II design and maximum-likelihood methods were implemented to investigate the genetic basis of variation for 15 floral and vegetative traits in four populations of the annual plant Amsinckia spectabilis (Boraginaceae) differing in mating system. Six variance components were estimated according to Cockerham and Weir's “bio” model c. Compared to the three partially selfing populations, we found significantly lower levels of nuclear variance for several traits in the nearly completely self-fertilizing population. Furthermore, for 11 of 15 traits we did not detect nuclear variation to be significantly greater than zero. We also found high maternal variance in one of the partially selfing populations for several traits, and little dominance variance in any population. These results are in agreement with the evolutionary dead-end hypothesis for highly self-fertilizing taxa.

© 2009 The Society for the Study of Evolution.
Magdalena P. Bartkowska and Mark O. Johnston "Quantitative Genetic Variation in Populations of Amsinckia spectabilis That Differ in Rate of Self-Fertilization," Evolution 63(5), 1103-1117, (1 May 2009). https://doi.org/10.1111/j.1558-5646.2008.00607.x
Received: 6 June 2008; Accepted: 1 November 2008; Published: 1 May 2009

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Additive variance
cockerham and weir “bio” model c
dead-end hypothesis
dominance variance
Maternal effects
mating system
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