Evolutionary History of the Mating System in Amsinckia (Boraginaceae)

Schoen, Daniel J.; Johnston, Mark O.; L'Heureux, Anne-Marie; Marsolais, Joyce V.

doi:10.2307/2411038

Cited by 92 publications

(138 citation statements)

References 37 publications

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“…We attempted to determine orthology among the GapC loci prior to performing other molecular evo- lutionary analyses by comparing the phylogenetic placement of GapC sequences from related Amsinckia species, A. vernicosa and A. intermedia. Phylogenetic analysis of these and the spectabilis sequences agree with the chloroplast DNA phylogeny of the genus obtained by Schoen et al (1997). Unfortunately, neither the vernicosa nor the intermedia sequences were useful in determining orthology: the vernicosa sequences formed a group distinct from all others, while the intermedia sequences grouped only with GapC3.…”

Section: Evidence For Duplication Of Gapc In Amsinckia Spectabilissupporting

confidence: 64%

“…A molecular phylogeny of the genus (Schoen et al 1997), combined with sequences obtained from two congeneric species (A. vernicosa and A. intermedia), suggests that the loss of introns 6 and 7 occurred in an ancestor of the genus. Since all of the corresponding GapC DNA sequences recovered from GenBank (i.e., maize, X15596; cassava, AF136149; Arabidopsis, M64119) share introns 6 and 7, the intron loss in Amsinckia is likely a relatively recent occurrence.…”

Section: Discussionmentioning

confidence: 99%

“…Morphological and molecular phylogenetic genetic evidence suggest that this group has undergone several independent evolutionary shifts in the mating system, leading to the existence of closely related outcrossing and selfing populations (Ray and Chisaki 1957a, b;Schoen et al 1997). We first present data in support of the hypothesis that GapC exists as a small gene family in the species Amsinckia spectabilis and then exploit sequence information from several populations to investigate the impact of mating system variation on rates and patterns of sequence evolution.…”

Section: Introductionmentioning

confidence: 91%

“…Plants belonging to the two varieties were grown from seed collected in natural populations in California Schoen 1995, 1996) (Table 1). Congeners of A. spectabilis (A. vernicosa and A. intermedia) used in this study were chosen based on a partial molecular phylogeny of the genus, and were each represented by single plants grown from seed collected in natural populations (Schoen et al 1997). DNA was extracted from fresh young leaves using the DNeasy Plant Mini Kit (Qiagen) or Nucleon PhytoPure Genomic DNA Extraction Kit (AmershamPharmacia).…”

Section: Plant Materialsmentioning

confidence: 99%

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Molecular Evolution of the GapC Gene Family in Amsinckia spectabilis Populations That Differ in Outcrossing Rate

Pérusse¹,

Schoen

2004

J Mol Evol

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Abstract. Molecular evolutionary analysis of the glyceraldehyde 3-phosphate dehydrogenase (GapC) gene family was conducted in the plant genus Amsinckia (Boraginaceae), a group that exhibits marked variation in the mating system. GapC genes in this group differ from those of Arabidopsis thaliana in terms of both intron size and number. Phylogenetic and Southern hybridization analyses suggest the presence of multiple GapC loci, each defined by a set of base substitutions that are in strong linkage disequilibrium. One species of Amsinckia, A. spectabilis, was studied in some detail. This species consists of selfing (A. s. spectabilis) and outcrossing (A. s. microcarpa) varieties. Two selfing populations and one outcrossing population sample were analyzed in detail for variation at one of the members of this gene family, GapC3. A reduction in number of GapC3 haplotypes and level of genetic diversity was observed in the selfing populations of A. spectabilis. GapC3 in the outcrossing population (but not the two selfing populations) exhibited a significant departure from neutrality in the direction of an excess of singletons. These results are discussed in the context of forces acting on sequence evolution in populations with different mating systems.

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Section: Evidence For Duplication Of Gapc In Amsinckia Spectabilissupporting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Plant Materialsmentioning

confidence: 99%

See 2 more Smart Citations

Molecular Evolution of the GapC Gene Family in Amsinckia spectabilis Populations That Differ in Outcrossing Rate

Pérusse¹,

Schoen

2004

J Mol Evol

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“…These features are commonly associated with the evolution of selfing (e.g. Schoen et al 1997), and related species of Hemimeris (e.g. H. sabulosa) are exclusively homostylous (Pauw 2005) and probably highly selfing.…”

Section: Phylogenetic Evidence Indicates Evolutionary Transitionsmentioning

confidence: 99%

Darwin's legacy: the forms, function and sexual diversity of flowers

Barrett

2010

Phil. Trans. R. Soc. B

116

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Charles Darwin studied floral biology for over 40 years and wrote three major books on plant reproduction. These works have provided the conceptual foundation for understanding floral adaptations that promote cross-fertilization and the mechanisms responsible for evolutionary transitions in reproductive systems. Many of Darwin's insights, gained from careful observations and experiments on diverse angiosperm species, remain remarkably durable today and have stimulated much current research on floral function and the evolution of mating systems. Here I review Darwin's seminal contributions to reproductive biology and provide an overview of the current status of research on several of the main topics to which he devoted considerable effort, including the consequences to fitness of cross-versus self-fertilization, the evolution and function of stylar polymorphisms, the adaptive significance of heteranthery, the origins of dioecy and related gender polymorphisms, and the transition from animal pollination to wind pollination. Post-Darwinian perspectives on floral function now recognize the importance of pollen dispersal and male outcrossed siring success in shaping floral adaptation. This has helped to link work on pollination biology and mating systems, two subfields of reproductive biology that remained largely isolated during much of the twentieth century despite Darwin's efforts towards integration.

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The best of both worlds? A review of delayed selfing in flowering plants

Goodwillie

Weber

2018

American J of Botany

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In a series of seminal papers, David G. Lloyd (1979;Lloyd and Schoen, 1992) provided new insight into plant mating-system evolution by recognizing that the selective consequences of selfand cross-pollination and fertilization depend on the specifics of how and when they occur. In phenotypic models, Lloyd showed that the conditions that select for self-fertilization (selfing) facilitated by pollinators differ from those for selfing that occurs autonomously. Further, the selective consequences of autonomous selfing were shown to depend on its timing in anthesis in relation to cross-fertilization (outcrossing). The theory predicts that selfing that occurs after opportunities for outcrossing have passed (delayed selfing) should be selected under the broadest range of conditions.In general, selection of selfing is expected to be opposed by inbreeding depression, the reduced fitness of selfed progeny that results primarily from the expression of deleterious recessive alleles Charlesworth, 1987, Charlesworth andWillis, 2009). Counteracting the cost of inbreeding depression is the 50% genetic transmission advantage of selfing, which occurs because INVITED SPECIAL ARTICLE The best of both worlds? A review of delayed selfing in flowering plantsCarol Goodwillie 1,3 and Jennifer J. Weber PREMISE OF STUDY:In a seminal body of theory, Lloyd showed that the fitness consequences of selfing will depend on its timing in anthesis. Selfing that occurs after opportunities for outcrossing or pollen dispersal can provide reproductive assurance when pollinators are limited and is expected to incur little cost, even when inbreeding depression is high. As a result, delayed selfing is often interpreted as a "best-of-both-worlds" mating system that combines the advantages of selfing and outcrossing. METHODS:We surveyed 65 empirical studies of delayed selfing, recording floral mechanisms and examining information on inbreeding depression, autofertility, and other parameters to test the support for delayed selfing as a best-of-both-worlds strategy.KEY RESULTS: Phylogenetic distribution of the diverse floral mechanisms suggests that some basic floral structures may predispose plant taxa to evolve delayed selfing. Delayed selfing appears to serve as a best-of-both-worlds strategy in some but not all species. While the capacity for autonomous selfing is often high, it is lower, in some cases, than in related species with earlier modes of selfing. In other delayed-selfers, low inbreeding depression and reduced investment in corollas and pollen suggest limited benefits from outcrossing.CONCLUSIONS: Despite a growing literature on the subject, experimental evidence for delayed selfing is limited and major gaps in knowledge remain, particularly with respect to the stability of delayed selfing and the conditions that may favor transitions between delayed and earlier selfing. Finally, we suggest a potential role of delayed selfing in facilitating transitions from self-incompatibility to selfing.

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Evolutionary History of the Mating System in Amsinckia (Boraginaceae)

Cited by 92 publications

References 37 publications

Molecular Evolution of the GapC Gene Family in Amsinckia spectabilis Populations That Differ in Outcrossing Rate

Molecular Evolution of the GapC Gene Family in Amsinckia spectabilis Populations That Differ in Outcrossing Rate

Darwin's legacy: the forms, function and sexual diversity of flowers

The best of both worlds? A review of delayed selfing in flowering plants

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