Reproductive isolation and hybrid pollen disadvantage in <i>Ipomopsis</i>
Abstract
Abstract One cause of reproductive isolation is gamete competition, in which conspecific pollen has an advantage over heterospecific pollen in siring seeds, thereby decreasing the formation of F1 hybrids. Analogous pollen interactions between hybrid pollen and conspecific pollen can contribute to post-zygotic isolation. The herbaceous plants Ipomopsis aggregata and I. tenuituba frequently hybridize in nature. Hand-pollination of I. aggregata with pollen from F1 or F2 hybrids produced as many seeds as hand-pollination with conspecific pollen, suggesting equal pollen viability. However, when mixed pollen loads with 50% conspecific pollen and 50% hybrid pollen were applied to I. aggregata stigmas, fewer than half of the seeds had hybrid sires. Such pollen mixtures are frequently received if plants of the two species and F1 and F2 hybrids are intermixed, suggesting that this advantage of conspecific over hybrid pollen reduces backcrossing and contributes to reproductive isolation.
Local Knowledge Graph (19 entities)
Related Works
Items connected by shared entities, co-authorship, citations, or semantic similarity.
Predicting patterns of mating and potential hybridization from pollinator behavior
Absence of conspecific pollen advantage in the dynamics of an <i>Ipomopsis</i> (Polemoniaceae) hybrid zone
Pollen transfer by natural hybrids and parental species in an <i>Ipomopsis</i> hybrid zone
Data from: Phylogeny does not predict the outcome of heterospecific pollen-pistil interactions in a species-rich alpine plant community
Data for: Pollinator and habitat-mediated selection as potential contributors to ecological speciation in two closely related species
Data from: Influence of plant reproductive systems on the evolution of hummingbird pollination
Growing Colorado Plants From Seed: State of the Art Volume III
Proceedings: Using Seeds of Native Species on Rangelands
Shrubland Ecosystem Genetics And Biodiversity: Proceedings
Cited By (49 times, 7 in Knowledge Hub)
Adaptation and diversification of bluebells <i>Mertensia</i> spp., Boranginaceae
Is Plant Fitness Proportional to Seed Set? An Experiment and a Spatial Model
Elevational and temporal variation in Ipomopsis floral and vegetative traits.
Lifetime fitness in two generations of <i>Ipomopsis</i> hybrids
Asymmetrical pollen success in Ipomopsis (Polemoniaceae) contact sites
Ecophysiology of first and second generation hybrids in a natural plant hybrid zone
Cytoplasmic and nuclear markers reveal contrasting patterns of spatial genetic structure in a natural <i>Ipomopsis</i> hybrid zone
References (27)
7 in Knowledge Hub, 20 external