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46 results for “Leavenworthia”
Leavenworthia stylosa (Brassicaceae) - stem - showing leaf bases
Image of Leavenworthia stylosa (Brassicaceae) - stem - showing leaf bases
Leavenworthia stylosa (Brassicaceae) - inflorescence - lateral view of flower
Image of Leavenworthia stylosa (Brassicaceae) - inflorescence - lateral view of flower
Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Image of Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Leavenworthia stylosa (Brassicaceae) - inflorescence - frontal view of flower
Image of Leavenworthia stylosa (Brassicaceae) - inflorescence - frontal view of flower
Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Image of Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Image of Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Leavenworthia stylosa (Brassicaceae) - stem - showing leaf bases
Image of Leavenworthia stylosa (Brassicaceae) - stem - showing leaf bases
Leavenworthia stylosa (Brassicaceae) - fruit - juvenile
Image of Leavenworthia stylosa (Brassicaceae) - fruit - juvenile
Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Image of Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Leavenworthia stylosa (Brassicaceae) - inflorescence - frontal view of flower
Image of Leavenworthia stylosa (Brassicaceae) - inflorescence - frontal view of flower
Leavenworthia stylosa (Brassicaceae) - leaf - basal or on lower stem
Image of Leavenworthia stylosa (Brassicaceae) - leaf - basal or on lower stem
Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Image of Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Leavenworthia stylosa (Brassicaceae) - inflorescence - frontal view of flower
Image of Leavenworthia stylosa (Brassicaceae) - inflorescence - frontal view of flower
Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Image of Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Image of Leavenworthia stylosa (Brassicaceae) - whole plant - in flower - general view
Leavenworthia uniflora (Brassicaceae) - whole plant - in fruit
Image of Leavenworthia uniflora (Brassicaceae) - whole plant - in fruit
Leavenworthia uniflora (Brassicaceae) - whole plant - in flower - general view
Image of Leavenworthia uniflora (Brassicaceae) - whole plant - in flower - general view
Leavenworthia uniflora (Brassicaceae) - inflorescence - lateral view of flower
Image of Leavenworthia uniflora (Brassicaceae) - inflorescence - lateral view of flower
Data from: Reproductive character displacement shapes a spatially structured petal color polymorphism in Leavenworthia stylosa
Character displacement is a potentially important process driving trait evolution and species diversification. Floral traits may experience character displacement in response to pollinator-mediated competition (ecological character displacement) or the risk of forming hybrids with reduced fitness (reproductive character displacement). We test these and alternative hypotheses to explain a yellow-white petal color polymorphism in Leavenworthia stylosa, where yellow morphs are spatially associated with a white-petaled congener (L. exigua) that produces hybrids with complete pollen sterility. A reciprocal transplant experiment found limited evidence of local adaptation of yellow color morphs via increased survival and seed set. Pollinator observations revealed that Leavenworthia attract various pollinators that generally favor white petals and exhibit color constancy. Pollen limitation experiments showed that yellow petals do not alleviate competition for pollination. Interspecific pollinator movements were infrequent and low hybridization rates (∼0.40% - 0.85%) were found in each morph, with natural rates likely being lower. Regardless, hybridization rates were significantly higher in white morphs of L. stylosa, yielding a small selection coefficient of s = 0.0042 against this phenotype in sympatry with L. exigua. These results provide support for reproductive character displacement as a mechanism contributing to the pattern of petal color polymorphism in L. stylosa.
Data from: Recent selection for self-compatibility in a population of Leavenworthia alabamica
The evolution of self-compatibility (SC) is the first step in the evolutionary transition in plants from outcrossing enforced by self-incompatibility (SI) to self-fertilization. In the Brassicaceae, SI is controlled by alleles of two tightly linked genes at the S-locus. Despite permitting inbreeding, mutations at the S-locus leading to SC may be selected if they provide reproductive assurance and/or gain a transmission advantage in a population when SC plants self- and outcross. Positive selection can leave a genomic signature in the regions physically linked to the focus of selection when selection has occurred recently. From an SC population of Leavenworthia alabamica with a known nonfunctional mutation at the S-locus, we collected sequence data from a ∼690 Kb region surrounding the S-locus, as well as from regions not linked to the S-locus. To test for recent positive selection acting at the S-locus, we examined polymorphism and the site-frequency spectra. Using forward simulations, we demonstrate that recent selection of the strength expected for SC at a locus formerly under balancing selection can generate patterns similar to those seen in our empirical data.
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