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10 results for “Collinsia”
How early does the selfing syndrome arise? Associations between selfing ability and flower size within populations of the mixed mater Collinsia verna
<p>Widespread associations between selfing rate and floral size within and among taxa suggest that these traits may evolve in concert. Does this association develop immediately, because of shared genetic/developmental control, or stepwise with selection shaping the evolution of one trait following the other? If the former, then association ought to appear within and across populations. We explore this fundamental question in three populations of the mixed-mater Collinsia verna where autonomous selfing (AS) ability has been shown to be under selection by the pollination environment. We grew clonal replicates of C. verna in a controlled environment to characterize broad-sense genetic correlations among traits within populations and to assess whether divergence in mating system and floral traits among these populations is consistent with their previously observed selection pressures. As predicted by their respective pollination environments, we demonstrate significant genetic divergence among populations in AS ability. However, patterns of divergence in floral traits (petal, stamen, and style size, stigmatic receptivity, and stigma-anther distance) were not as expected. Within populations, genetic variation in AS appeared largely independent from floral traits, except for a single weak negative association in one population between flower size and AS rate. Together, these results suggest that associations between selfing rate and floral traits across Collinsia species are not reflected at microevolutionary scales. If C. verna were to continue evolving toward the selfing syndrome, floral trait evolution would likely follow stepwise from mating system evolution.</p>
How early does the selfing syndrome arise? Associations between selfing ability and flower size within populations of the mixed mater Collinsia verna
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Collinsia verna (Scrophulariaceae) - inflorescence - whole - unspecified
Image of Collinsia verna (Scrophulariaceae) - inflorescence - whole - unspecified
Data for: Drought and temperature stresses impact pollen production and autonomous selfing in a California wildflower, Collinsia heterophylla
<p>Ongoing climatic changes have altered growing conditions for plants by limiting water availability and inducing unprecedented temperature increases, eliciting plant functional responses that compromise floral trait expression, reduce pollen production but promote early self-pollination. In a controlled greenhouse study, plants of <em>Collinsia heterophylla</em>, an annual mixed-mated hermaphrodite, were grown under temperature and water stresses. Floral trait responses and related effects on plant reproductive success were recorded. Plants grown under temperature and water stresses were shorter and had fewer leaves at flowering than control plants. Temperature-stressed plants flowered earlier and had smaller flowers that produced fewer per capita pollen grains than control and water-stressed plants. While lifetime flower production in plants experiencing temperature stress alone or water stress alone was similar to control plants, those receiving combined temperature and water stresses had significantly lower lifetime flower production. Abiotic stress did not affect investment in female traits such as ovule number per flower but impacted male traits seen as fewer pollen grains per flower. In plants experiencing abiotic stress, an increase in autonomous self-pollination was facilitated through a compromise in herkogamy, a sexual interference mechanism to promote cross-pollination. Spatial separation between stigma and anther, a measure of herkogamy, was zero or negative in stressed plants. Thus, abiotic stress responses in plants did not compromise plant reproductive success as autonomous selfing was augmented. In nature, such responses will likely reduce available nutrition for pollinators through decreased flower and pollen production.</p>
Three new taxa of Collinsia (Plantaginaceae) provide additional evidence for neoendemism in the upper Merced River watershed of the central Sierra Nevada, California
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Data for: Drought and temperature stresses impact pollen production and autonomous selfing in a California wildflower, Collinsia heterophylla
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Data offspring performance following two-donor crosses at different floral stages and with different competitor types in greenhouse studies of Collinsia heterophylla
<p>Data on two offspring performance traits (seeds per capsule and flower number) in greenhouse studies of Collinsia heterophylla to investigate indirect benefits of mate choice. We performed two-donor pollinations during successive floral stages and with different competitor types (outcross and self) to assess how stigma receptivity and two pollen traits known to affect siring success influence offspring performance. We also investigated the link between seed production in mothers and offspring as an indication of heritability of this trait, and differential resource allocation by studying the influence of sibling performance in the same capsule.</p>
Data offspring performance following two-donor crosses at different floral stages and with different competitor types in greenhouse studies of Collinsia heterophylla
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Data from GCMS analysis of floral odours and pollinator visitation in Collinsia heterophylla polymorphic for floral colour
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New genomic resources and comparative analyses reveal differences in floral gene expression in selfing and outcrossing Collinsia sister species
GEO Series GSE174273. Collinsia rattanii. 18 samples. Type: Expression profiling by high throughput sequencing.
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