Enantiostyly in <i>Wachendorfia</i> (Haemodoraceae): the influence of reproductive systems on the maintenance of the polymorphism

Jesson, Linley K.; Barrett, Spencer C. H.

doi:10.3732/ajb.89.2.253

Cited by 36 publications

(42 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Colonization events involving a single style morph followed by selfing best explain the pattern of style-morph structure we observed. Indeed, a similar pattern of stylar monomorphism also occurs in Wachendorfia parviflora, a species with dimorphic enantiostyly, small flowers and high selfing rates ( Jesson & Barrett 2002b).…”

Section: Discussionmentioning

confidence: 99%

“…Left-and right-styled flowers can occur on the same individual or on separate individuals, and these two conditions are referred to as 'monomorphic' and 'dimorphic' enantiostyly, respectively, with individual species exhibiting a single condition only (Barrett et al 2000). Dimorphic enantiostyly is considerably less common than monomorphic enantiostyly, and is reported from only seven species in three monocotyledonous families (Haemodoraceae, Jesson & Barrett 2002b; Pontederiaceae, this study; Tecophilaeaceae, Dulberger & Ornduff 1980). By contrast, monomorphic enantiostyly occurs in at least 10 families, including both monocotyledons and dicotyledons (reviewed in Jesson 2002).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The genetics of mirror-image flowers

Jesson

Barrett

2002

Proc. R. Soc. Lond. B

View full text Add to dashboard Cite

Conspicuous asymmetries in forms that are polymorphic within a species can be genetically or environmentally determined. Here, we present a genetic analysis of the inheritance of dimorphic enantiostyly, a sexual polymorphism in which all flowers on a plant have styles that are consistently deflected either to the left or the right side of the floral axis. Using Heteranthera multiflora (Pontederiaceae), a short-lived herb, we conducted crosses within and between left-and right-styled plants and scored progeny ratios of the style morphs in F 1 , F 2 and F 3 generations. Crosses conducted in the parental generation between morphs or right-styled plants resulted in right-styled progeny, whereas crosses between left-styled plants resulted in left-styled progeny. When putative heterozygous F 1 plants were selfed, the resulting F 2 segregation ratios were not significantly different from a 3 : 1 ratio for right-and left-styled plants. Crosses between left-and right-styled plants in the F 2 generation yielded F 3 progeny with either a 1 : 1 ratio of left-and right-styled plants or right-styled progeny. Our results are consistent with a model in which a single Mendelian locus with two alleles, with the right-styled allele (R) dominant to the left-styled allele (r), governs stylar deflection. The simple inheritance of dimorphic enantiostyly has implications for the evolution and maintenance of this unusual sexual polymorphism.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The genetics of mirror-image flowers

Jesson

Barrett

2002

Proc. R. Soc. Lond. B

View full text Add to dashboard Cite

show abstract

“…2 in Barrett 2002). In contrast, populations of dimorphically enantiostylous species are composed of left-and right-styled plants, often in equal frequencies, as in Wachendorfia (Jesson & Barrett 2002a). Here the condition is a true genetic polymorphism and inheritance studies of stylar bending in Heteranthera multiflora indicate single-locus control with right deflection dominant to left ( Jesson & Barrett 2002b).…”

Section: Darwin and The Foundations Of Plant Reproductive Biology (A)mentioning

confidence: 97%

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

Barrett

2010

Phil. Trans. R. Soc. B

119

View full text Add to dashboard Cite

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.

show abstract

“…In four of the ten such studies available, traits promoting cross-pollination appear to be maintained by selection consistent with the BOBW hypothesis; delayed-selfers in Leptosiphon (Goodwillie, 1999), Primula (Primulaceae, de Vos et al, 2012), Schizanthus (Solanaceae; Pérez et al, 2009) and Camissoniopsis (Dart et al, 2012) produce flowers that are similar in size to highly outcrossing congeners or conspecific populations. In contrast, delayed-selfing species of Wachendorfia (Haemodoraceae) and Tillandsia (Bromeliaceae) produce flowers only about half and one quarter the size, respectively, of closely related outcrossers (Jesson and Barrett, 2002;Orozco-Ibarrola et al, 2015). Similarly, in Clarkia (Onagraceae), Anagallis (Primulaceae), Trifolium (Fabaceae), and Myosotis (Boraginaceae), delayed-selfers were substantially reduced in petal size, pollen-to-ovule ratio or both, compared to more outcrossing sister species (Robertson and Lloyd, 1991;Gibbs and Taverna, 2001;Dhar et al 2006;Mazer et al, 2007).…”

Section: Allocation To and Benefits Of Outcrossingmentioning

confidence: 99%

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

Goodwillie

Weber

2018

American J of Botany

View full text Add to dashboard Cite

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.

show abstract

Enantiostyly in Wachendorfia (Haemodoraceae): the influence of reproductive systems on the maintenance of the polymorphism

Cited by 36 publications

References 49 publications

The genetics of mirror-image flowers

The genetics of mirror-image flowers

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

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

Contact Info

Product

Resources

About