Genetics of sex allocation in <i>Mimulus</i> (Scrophulariaceae)

Fenster, Charles B.; Carr, David E.

doi:10.1046/j.1420-9101.1997.10040641.x

Cited by 51 publications

(72 citation statements)

References 75 publications

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“…Characteristics of the studies (number of populations, whether h 2 or r g were reported) are also noted in Table A1. Carr and Fenster (1994), Fenster and Carr (1997), Mossop et al (1994), Ritland and Ritland (1996), Robertson et al (1994) Genetic constraints on floral evolution T-L Ashman and CJ Majetic…”

Section: Discussionmentioning

confidence: 99%

Genetic constraints on floral evolution: a review and evaluation of patterns

2006

Heredity

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The characteristics of flowers influence most aspects of angiosperm reproduction, including the agents of pollination and patterns of mating. Thus, a clear view of the forces that mediate floral phenotypic evolution is central to understanding angiosperm diversity. Here, we inform on the capacity for floral phenotype to respond to selection by reviewing published data on heritabilities and genetic correlations for several classes of floral traits (primary sexual, attraction, mating system) in hermaphroditic plants. We find significant heritability for all floral traits but also variation among them, as well as a tendency for heritability to vary with mating system, but not life history. We additionally test predictions stemming from life history theory (eg, negative covariation between male-female traits and flower size-flower number), and ideas concerning the extent and pattern of genetic integration between flowers and leaves, and between the sexes of dioecious and gynodioecious species. We find mixed evidence for life history tradeoffs. We find strong support for floral integration and its relation with floral morphology (actinomorphy vs zygomorphy) and for a decoupling of floral and vegetative traits, but no evidence that modular integration varies with floral morphology. Lastly, we find mixed evidence for a relationship between the level of sexual dimorphism in attraction traits and the between-sex correlation in gender dimorphic plants.

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Section: Discussionmentioning

confidence: 99%

Genetic constraints on floral evolution: a review and evaluation of patterns

2006

Heredity

188

180

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“…Values are ranked from the smallest to the largest. n Number of individuals studied, r correlation coefficient ties, such as pollen grains (e.g., Stanton and Young 1994), may be compensated by the effects of genes that control the acquisition of resources (Houle 1991), which can eliminate or reverse genetic correlations between competing entities (e.g., Young et al 1994;Fenster and Carr 1997).…”

Section: Discussionmentioning

confidence: 99%

Pollen-pistil relationships and pollen size-number trade-off in species of the tribe Lycieae (Solanaceae)

Aguilar

Bernardello

Galetto

2002

Journal of Plant Research

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Pollen volume may be involved in different associations with other floral traits. Particularly, the literature indicates that pollen volume can be implicated in a functional relationship with pistil length, and that it may be affected by a trade-off with pollen number because of the subdivision of limited resources. To assess these associations, pollen volume was subjected to correlation analyses with pollen number and pistil length in 20 Argentinean and Chilean taxa of the monophyletic tribe Lycieae. Depending on the mechanisms operating on pollen size and number, the variability of these traits may be different. Therefore, their coefficients of variation were compared. Pistil length and pollen volume showed a strong positive correlation. In contrast, pollen grain size and number were significantly correlated at neither inter- nor intraspecific levels. Results suggest that pollen size and pistil length may co-evolve. The central role of this interaction is discussed. The lack of a correlated variation in pollen size and number may be related to the similar constraints experienced by the species and/or because constraints are operating at the plant level and not at the species level. Lower variance in pollen size compared with pollen number denotes that pollen size may be the main trait subjected to natural selection.

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“…The most widespread of the selfing taxa, M. nasutus, produces reduced, often cleistogamous flowers. Where M. guttatus and M. nasutus co-occur, potential premating barriers to hybridization include differences in microhabitat and flowering time (Martin and Willis 2007) as well as differences in floral morphology (Ritland and Ritland 1989), pollen production (Fenster and Carr 1997), and pollen tube growth (Diaz and MacNair 1999) associated with their different mating systems. Despite these barriers to mating, hybrids are observed at low frequency at many sympatric sites, and there is evidence of recent local introgression at nuclear loci (Sweigart and Willis 2003).…”

Section: Methodsmentioning

confidence: 99%

The Nuclear Component of a Cytonuclear Hybrid Incompatibility in Mimulus Maps to a Cluster of Pentatricopeptide Repeat Genes

Barr

Fishman

2010

Genetics

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Characterizing the genetic and molecular basis of hybrid incompatibilities is a first step toward understanding their evolutionary origins. We fine mapped the nuclear restorer (Rf ) of cytoplasm-dependent anther sterility in Mimulus hybrids by identifying and targeting regions of the Mimulus guttatus genome containing large numbers of candidate pentatricopeptide repeat genes (PPRs). The single Mendelian locus Rf was first isolated to a 1.3-cM region on linkage group 7 that spans the genome's largest cluster of PPRs, then split into two tightly linked loci (Rf1 and Rf2) by ,10 recombination events in a large (N ¼ 6153) fine-mapping population. Progeny testing of fertile recombinants demonstrated that a dominant M. guttatus allele at each Rf locus was sufficient to restore fertility. Each Rf locus spans a physical region containing numerous PPRs with high homology to each other, suggesting recent tandem duplication or transposition. Furthermore, these PPRs have higher homology to restorers in distantly related taxa (petunia and rice) than to PPRs elsewhere in the Mimulus genome. These results suggest that the cytoplasmic male sterility (CMS)-PPR interaction is highly conserved across flowering plants. In addition, given our theoretical understanding of cytonuclear coevolution, the finding that hybrid CMS results from interactions between a chimeric mitochondrial transcript that is modified by Rf loci identified as PPRs is consistent with a history of selfish mitochondrial evolution and compensatory nuclear coevolution within M. guttatus.

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Genetics of sex allocation in Mimulus (Scrophulariaceae)

Cited by 51 publications

References 75 publications

Genetic constraints on floral evolution: a review and evaluation of patterns

Genetic constraints on floral evolution: a review and evaluation of patterns

Pollen-pistil relationships and pollen size-number trade-off in species of the tribe Lycieae (Solanaceae)

The Nuclear Component of a Cytonuclear Hybrid Incompatibility in Mimulus Maps to a Cluster of Pentatricopeptide Repeat Genes

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