The contribution of male-sterility mutations to inbreeding depression in Mimulus guttatus.

摘要: The magnitude of inbreeding depression can influence many aspects a population’s ecology and evolution, including the nature selection acting on mating system chances that population will go extinct during periods small size. If is caused primarily by recessive mutations large effect fitness, such as lethals or steriles, then it expected to be purged rapidly with moderate amounts inbreeding. In contrast, genes mild effects fitness not inbreeding, so should more resilient barrier evolution self-fertilization significant threat survival endangered species. Here I show male-sterility alleles at individual loci are common in outcrossing plant Mimulus guttatus. Despite high frequency these major mutations, most for male fertility cumulative measures lifetime results from mildly deleterious alleles. Male-sterility contribute 31% fraction viable pollen grains, 26% total fitness. These suggest this would purged, short term,