Inbreeding depression in self-incompatible and self-compatible populations of Leavenworthia alabamica
نویسندگان
چکیده
منابع مشابه
Inbreeding depression in small populations of self-incompatible plants.
Self-incompatibility (SI) is a widespread mechanism that prevents inbreeding in flowering plants. In many species, SI is controlled by a single locus (the S locus) where numerous alleles are maintained by negative frequency-dependent selection. Inbreeding depression, the decline in fitness of selfed individuals compared to outcrossed ones, is an essential factor in the evolution of SI systems. ...
متن کاملMixed mating in a recently derived self-compatible population of Leavenworthia alabamica (Brassicaceae).
UNLABELLED PREMISE OF THE STUDY A mixture of outcrossing and selfing is often observed in plant populations. Although mixed mating is ubiquitous, it has several potential evolutionary explanations. Mixed mating may be actively maintained by selection, passively determined by the pollination environment, or a transitional stage during the evolution of self-fertilization. • METHODS We studie...
متن کاملThe evolution of self-compatibility in geographically peripheral populations of Leavenworthia alabamica (Brassicaceae).
Self-compatibility and adaptations to self-fertilization are often found in plant populations at the periphery of species' ranges or on islands. Self-compatibility may predominate in these environments because it provides reproductive assurance when pollinators or availability of mates limits seed production. This possibility was studied in Leavenworthia alabamica, a flowering plant endemic to ...
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Knowledge of which genes and pathways are affected by inbreeding may help understanding the genetic basis of inbreeding depression, the potential for purging (selection against deleterious recessive alleles), and the transition from outcrossing to selfing. Arabidopsis lyrata is a predominantly self-incompatible perennial plant, closely related to the selfing model species A. thaliana. To examin...
متن کاملInbreeding depression is high in a self‐incompatible perennial herb population but absent in a self‐compatible population showing mixed mating
High inbreeding depression is thought to be one of the major factors preventing evolutionary transitions in hermaphroditic plants from self-incompatibility (SI) and outcrossing toward self-compatibility (SC) and selfing. However, when selfing does evolve, inbreeding depression can be quickly purged, allowing the evolution of complete self-fertilization. In contrast, populations that show interm...
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ژورنال
عنوان ژورنال: Heredity
سال: 2004
ISSN: 0018-067X,1365-2540
DOI: 10.1038/sj.hdy.6800584