Journal
AMERICAN JOURNAL OF BOTANY
Volume 95, Issue 4, Pages 482-489Publisher
WILEY
DOI: 10.3732/ajb.95.4.482
Keywords
biparental inbreeding; correlated paternity; inbreeding depression; mating system; pollen limitation; reproductive assurance; self-incompatibility
Categories
Ask authors/readers for more resources
The evolution of self-fertilization from primarily outcrossing ancestors is one of the most common evolutionary transitions in plants, however, the ecological mechanisms that maintain self-fertilization have remained controversial. Theoretical studies suggest that selfing is advantageous over outcrossing in terms of genetic transmission and assurance of seed production under pollen-limited circumstances. Trillium camschatcense is a herbaceous perennial distributed in Hokkaido and northern Honshu, Japan. Geographical variation in the breeding system (self-compatible, SC; or self-incompatible, SI) has been reported in populations in Hokkaido. Here, we used several SC and SI populations of T camschatcense to investigate the adaptive significance and the evolutionary basis of self-fertilization. Pollination experiments and genetic analyses demonstrated that the potential availability of outcross pollen in SC populations was sufficient and that the number of pollen donors was equal to that of SI populations. However. despite the high availability of outcross pollen, the SC populations produced seeds predominantly by selfing and so underwent severe inbreeding depression. Although none of the suggested advantages for self-fertilization were supported by our analyses, we propose two possible scenarios for the evolution of self-fertilization in T camschatcense.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available