The Genetic Basis of Floral Traits Associated With Mating System Evolution in Leptosiphon (Polemoniaceae): An Analysis of Quantitative Trait Loci

Goodwillie, Carol; Ritland, Carol; Ritland, Kermit

doi:10.1111/j.0014-3820.2006.tb01131.x

Cited by 71 publications

(35 citation statements)

References 74 publications

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“…QTL analyses of traits potentially involved in pre-or postzygotic isolating barriers in plants have repeatedly found that QTLs for different traits cluster in particular areas of the genome (Fishman et al, 2002;Hodges et al, 2002;Rieseberg et al, 2003;Bratteler et al, 2006;Goodwillie et al, 2006;Moyle, 2007), thus providing evidence for the occurrence of pleiotropy or linkage among QTLs for different traits. Whether such clustering of QTLs is due to pleiotropy or tight linkage is often unknown (Conner, 2002), but both cause strong correlations among the traits involved.…”

Section: Interactions Among Barriers: Ecological and Molecularmentioning

confidence: 99%

Evolution of reproductive isolation in plants

2008

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Reproductive isolation is essential for the process of speciation and much has been learned in recent years about the ecology and underlying genetics of reproductive barriers. But plant species are typically isolated not by a single factor, but by a large number of different pre-and postzygotic barriers, and their potentially complex interactions. This phenomenon has often been ignored to date. Recent studies of the relative importance of different isolating barriers between plant species pairs concluded that prezygotic isolation is much stronger than postzygotic isolation. But studies of the patterns of reproductive isolation in plants did not find that prezygotic isolation evolves faster than postzygotic isolation, in contrast to most animals. This may be due to the multiple premating barriers that isolate most species pairs, some of which may be controlled by few genes of major effect and evolve rapidly, whereas others have a complex genetic architecture and evolve more slowly. Intrinsic postzygotic isolation in plants is correlated with genetic divergence, but some instrinsic postzygotic barriers evolve rapidly and are polymorphic within species. Extrinsic postzygotic barriers are rarely included in estimates of different components of reproductive isolation. Much remains to be learned about ecological and molecular interactions among isolating barriers. The role of reinforcement and reproductive character displacement in the evolution of premating barriers is an open topic that deserves further study. At the molecular level, chromosomal and genic isolation factors may be associated and act in concert to mediate reproductive isolation, but their interactions are only starting to be explored.

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Section: Interactions Among Barriers: Ecological and Molecularmentioning

confidence: 99%

Evolution of reproductive isolation in plants

2008

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“…QTL mapping studies have often found genomic regions that influence variation in multiple floral traits (for example, Juenger et al, 2000;Fishman et al, 2002;Goodwillie et al, 2006;Bouck et al, 2007). Pleitropy or tight linkage of QTLs that influence floral traits may constrain floral evolution in a hybrid zone.…”

Section: Genetic Architecture Of Floral Characteristicsmentioning

confidence: 99%

Genomic collinearity and the genetic architecture of floral differences between the homoploid hybrid species Iris nelsonii and one of its progenitors, Iris hexagona

Taylor

Rojas

et al. 2012

Heredity

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Hybrid speciation represents a relatively rapid form of diversification. Early models of homoploid hybrid speciation suggested that reproductive isolation between the hybrid species and progenitors primarily resulted from karyotypic differences between the species. However, genic incompatibilities and ecological divergence may also be responsible for isolation. Iris nelsonii is an example of a homoploid hybrid species that is likely isolated from its progenitors primarily by strong prezygotic isolation, including habitat divergence, floral isolation and post-pollination prezygotic barriers. Here, we used linkage mapping and quantitative trait locus (QTL) mapping approaches to investigate genomic collinearity and the genetic architecture of floral differences between I. nelsonii and one of its progenitor species I. hexagona. The linkage map produced from this cross is highly collinear with another linkage map produced between I. fulva and I. brevicaulis (the two other species shown to have contributed to the genomic makeup of I. nelsonii), suggesting that karyotypic differences do not contribute substantially to isolation in this homoploid hybrid species. Similar to other studies of the genetic architecture of floral characteristics, at least one QTL was found that explained 420% variance in each color trait, while minor QTLs were detected for each morphological trait. These QTLs will serve as hypotheses for regions under selection by pollinators.

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“…The genetic basis of the selfing syndrome has been studied using quantitative genetic approaches in three different genera, Mimulus, Leptosiphon, and Solanum (Lycopersicon) (Bernacchi and Tanksley, 1997;Lin and Ritland, 1997;Fishman et al, 2002;Georgiady et al, 2002;Goodwillie et al, 2006). In general, a moderate to large number of quantitative trait loci (QTL) affect individual floral traits, each with small to moderate effects.…”

Section: Introductionmentioning

confidence: 99%

Genetics, Evolution, and Adaptive Significance of the Selfing Syndrome in the GenusCapsella

et al. 2011

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The change from outbreeding to selfing is one of the most frequent evolutionary transitions in flowering plants. It is often accompanied by characteristic morphological and functional changes to the flowers (the selfing syndrome), including reduced flower size and opening. Little is known about the developmental and genetic basis of the selfing syndrome, as well as its adaptive significance. Here, we address these issues using the two closely related species Capsella grandiflora (the ancestral outbreeder) and red shepherd's purse (Capsella rubella, the derived selfer). In C. rubella, petal size has been decreased by shortening the period of proliferative growth. Using interspecific recombinant inbred lines, we show that differences in petal size and flower opening between the two species each have a complex genetic basis involving allelic differences at multiple loci. An intraspecific cross within C. rubella suggests that flower size and opening have been decreased in the C. rubella lineage before its extensive geographical spread. Lastly, by generating plants that likely resemble the earliest ancestors of the C. rubella lineage, we provide evidence that evolution of the selfing syndrome was at least partly driven by selection for efficient self-pollination. Thus, our studies pave the way for a molecular dissection of selfingsyndrome evolution.

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The Genetic Basis of Floral Traits Associated With Mating System Evolution in Leptosiphon (Polemoniaceae): An Analysis of Quantitative Trait Loci

Cited by 71 publications

References 74 publications

Evolution of reproductive isolation in plants

Evolution of reproductive isolation in plants

Genomic collinearity and the genetic architecture of floral differences between the homoploid hybrid species Iris nelsonii and one of its progenitors, Iris hexagona

Genetics, Evolution, and Adaptive Significance of the Selfing Syndrome in the GenusCapsella

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