Leaf shape evolution has a similar genetic architecture in three edaphic specialists within the<i>Mimulus guttatus</i>species complex

Ferris, Kathleen G.; Rushton, Tullia; Greenlee, Anna B.; Toll, Katherine; Blackman, Benjamin K.; Willis, John H.

doi:10.1093/aob/mcv080

Cited by 39 publications

(56 citation statements)

References 62 publications

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“…) as described in previous work (Ferris et al . ). Briefly, the convex hull analysis consists of comparing the area of each leaf's convex hull (the shape created by connecting the outermost points of a leaf) to the leaf's true area and dividing this difference in area by the convex hull area to control for size.…”

Section: Methodsmentioning

confidence: 97%

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The genetic architecture of local adaptation and reproductive isolation in sympatry within the Mimulus guttatus species complex

et al. 2016

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The genetic architecture of local adaptation has been of central interest to evolutionary biologists since the modern synthesis. In addition to classic theory on the effect size of adaptive mutations by Fisher, Kimura and Orr, recent theory addresses the genetic architecture of local adaptation in the face of ongoing gene flow. This theory predicts that with substantial gene flow between populations local adaptation should proceed primarily through mutations of large effect or tightly linked clusters of smaller effect loci. In this study, we investigate the genetic architecture of divergence in flowering time, mating system-related traits, and leaf shape between Mimulus laciniatus and a sympatric population of its close relative M. guttatus. These three traits are probably involved in M. laciniatus' adaptation to a dry, exposed granite outcrop environment. Flowering time and mating system differences are also reproductive isolating barriers making them 'magic traits'. Phenotypic hybrids in this population provide evidence of recent gene flow. Using next-generation sequencing, we generate dense SNP markers across the genome and map quantitative trait loci (QTLs) involved in flowering time, flower size and leaf shape. We find that interspecific divergence in all three traits is due to few QTL of large effect including a highly pleiotropic QTL on chromosome 8. This QTL region contains the pleiotropic candidate gene TCP4 and is involved in ecologically important phenotypes in other Mimulus species. Our results are consistent with theory, indicating that local adaptation and reproductive isolation with gene flow should be due to few loci with large and pleiotropic effects.

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Section: Methodsmentioning

confidence: 97%

“…There is an association between occupation of dry rocky habitat and lobed leaf shape within the M. guttatus species complex (Ferris et al . , ).…”

Section: Introductionmentioning

confidence: 99%

The genetic architecture of local adaptation and reproductive isolation in sympatry within the Mimulus guttatus species complex

et al. 2016

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“…), and this leaf shape is thought to be adaptive in the exposed, fast‐drying environments in which it grows (Ferris et al . , ). Mimulus laciniatus mainly grows within moss patches on ephemeral, slow‐draining seeps on rocky outcrops (Fig.…”

Section: Methodsmentioning

confidence: 99%

Climate structures genetic variation across a species' elevation range: a test of range limits hypotheses

et al. 2016

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Gene flow may influence the formation of species range limits, and yet little is known about the patterns of gene flow with respect to environmental gradients or proximity to range limits. With rapid environmental change, it is especially important to understand patterns of gene flow to inform conservation efforts. Here we investigate the species range of the selfing, annual plant, Mimulus laciniatus, in the California Sierra Nevada. We assessed genetic variation, gene flow, and population abundance across the entire elevation-based climate range. Contrary to expectations, within-population plant density increased towards both climate limits. Mean genetic diversity of edge populations was equivalent to central populations; however, all edge populations exhibited less genetic diversity than neighbouring interior populations. Genetic differentiation was fairly consistent and moderate among all populations, and no directional signals of contemporary gene flow were detected between central and peripheral elevations. Elevation-driven gene flow (isolation by environment), but not isolation by distance, was found across the species range. These findings were the same towards highand low-elevation range limits and were inconsistent with two common centre-edge hypotheses invoked for the formation of species range limits: (i) decreasing habitat quality and population size; (ii) swamping gene flow from large, central populations. This pattern demonstrates that climate, but not centre-edge dynamics, is an important range-wide factor structuring M. laciniatus populations. To our knowledge, this is the first empirical study to relate environmental patterns of gene flow to range limits hypotheses. Similar investigations across a wide variety of taxa and life histories are needed.

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“…This well-known leaf plasticity is today better understood. Considering the traditional forms for which they were conceived and the textures that were influenced by their habits and adaptations (or as a defence against herbivores), the important role of KNOX genes is now well recognized about its influence in this process (Royer et al 2010, Nicotra et al 2011, Dkhar & Pareek 2014, Ferris et al 2015.…”

Section: Discussionmentioning

confidence: 99%

New plant fossils from the Lower Cretaceous of the Parnaíba Basin, Northeastern Brazil: Southern Laurasia links

et al. 2018

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Leaf shape evolution has a similar genetic architecture in three edaphic specialists within theMimulus guttatusspecies complex

Cited by 39 publications

References 62 publications

The genetic architecture of local adaptation and reproductive isolation in sympatry within the Mimulus guttatus species complex

The genetic architecture of local adaptation and reproductive isolation in sympatry within the Mimulus guttatus species complex

Climate structures genetic variation across a species' elevation range: a test of range limits hypotheses

New plant fossils from the Lower Cretaceous of the Parnaíba Basin, Northeastern Brazil: Southern Laurasia links

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