Spatial structure and inbreeding depression in slickspot peppergrass, Lepidium papilliferum (Brassicaceae)

摘要: In plants with limited pollen and seed dispersal, populations are often spatially structured such that neighboring individuals more closely related to one another than distant individuals. Mating among close relatives, including selfing, may lead a reduction in reproductive performance through the effects of prezygotic mating barriers inbreeding depression. Studying 11 slickspot peppergrass, Lepidium papilliferum (L.F. Hend.) A. Nels. J.F. Macbr (Brassicaceae), rare mustard endemic southwestern Idaho, we investigated whether small (16–746 flowering individuals) exhibit spatial structure as previously reported for large (>3000 individuals). Through hand-pollination experiments found percent fruit set increased increasing distance between parents up 3 m, declined slightly but nonsignificantly at greater outcrossing distances. Self-pollinated produced little or no fruit. Germination seeds from ...