Finally, we tested whether bee pollinators discriminate among naturally occurring UV phenotypes in two settings: wild bee communities and captive Bombus impatiens.â€¢ Within M. To examine the pattern of inheritance, we conducted crosses within and between UV phenotypes. guttatus.â€¢ We document UV patterns in 18 annual and 19 perennial populations and test whether UV pattern is associated with life history. We then test whether naturally occurring UV phenotypes influence pollinator interactions within M. Here, we describe the geographic distribution and pattern of inheritance of a UV polymorphism in the model plant species Mimulus guttatus (Phrymaceae). Thus, few studies have explicitly described the distribution or ecological significance of intraspecific variation in UV floral patterning.

UV patterns may vary within species, yet are cryptic to human observers. Â€¢ Ultraviolet (UV) floral patterns are common in angiosperms and mediate pollinator attraction, efficiency, and constancy. Peterson, Megan L Miller, Timothy J Kay, Kathleen M New Phytologist Â© 2016 New Phytologist Trust.Īn ultraviolet floral polymorphism associated with life history drives pollinator discrimination in Mimulus guttatus. guttatus species complex, an important ecological model system, and provide a partial mechanism for the hybrid barrier between M. We shed light on the extent of developmental variation between closely related species within the M. Hybrid seed inviability forms a potent reproductive barrier between M. These developmental patterns are reflected in mature hybrid seeds, which are either small and flat (indicating little to no endosperm) or shriveled (indicating reduced endosperm volume). Some hybrid seeds exhibit early disruption of endosperm development and are completely inviable, while others develop relatively normally at first, but later exhibit impaired endosperm proliferation and low germination success. nudatus differ in the pattern and timing of endosperm and embryo development. We address whether disruption in hybrid seed development is the primary source of reproductive isolation between these sympatric taxa. We investigate patterns of endosperm and embryo development in Mimulus guttatus and the closely related, serpentine endemic Mimulus nudatus, and compare them to those of reciprocal hybrid seed. Oneal, Elen Willis, John H Franks, Robert Gĭivergence of developmental mechanisms within populations could lead to hybrid developmental failure, and might be a factor driving speciation in angiosperms. Disruption of endosperm development is a major cause of hybrid seed inviability between Mimulus guttatus and Mimulus nudatus.

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