期刊
HEREDITY
卷 87, 期 -, 页码 190-197出版社
SPRINGERNATURE
DOI: 10.1046/j.1365-2540.2001.00897.x
关键词
Boraginaceae; conservation; endemism; inbreeding depression; island; mating system; outbreeding depression
In this study we examined the relative effects of inbreeding and outbreeding on offspring fitness over two generations in Anchusa crispa Viv., a rare species which on Corsica (France) occurs in small populations composed of patches of few individuals. Self- and outcross-pollinations were carried out in a single population and F-1 progeny grown to flowering. Plants grown from selfing and outcrossing were then selfed or outcrossed to produce F-2 individuals in four combinations of pollination treatments over two generations, i.e. self + self, self + outcross, outcross + self and outcross + outcross. In the F-1 generation, selfed progeny had a significantly greater number of cymes per plant than outcrossed progeny (P = 0.006). Plants from two generations of selfing had fewer seeds per fruit (P = 0.06) but a significantly greater survival rate (P < 0.001) and a greater number of cymes (P = 0.06) than those from two generations of outcrossing. Selfed F-2 from outcrossed F-1 had a significantly greater number of cymes (P < 0.01) than outcrossed F-2 from outcrossed F-1. In the comparison between selfed and outcrossed F-2 from selfed F-1 the former had a significantly greater survival rate (P < 0.001), but the latter significantly more flowers per cyme (P < 0.05). Together, these results indicate that outbreeding depression may occur on a very local scale within populations of this rare endemic species, with important implications for the conservation of rare plants.
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