Mating system and population genetic structure of an androdioecious tree, Fraxinus lanuginosa Koidz. (Oleaceae) in northern Japan

Heredity
K Ishida, Tsutom Hiura

Abstract

Models for the maintenance of androdioecy have suggested that selfing of hermaphrodites decreases the frequency of males in a population (the "male frequency"). To test this hypothesis, we used electrophoretic allozyme methods to study the mating system and population genetics of an androdioecious tree, Fraxinus lanuginosa, which exhibits large variations in male frequency among subpopulations in central Hokkaido (northern Japan). We estimated the outcrossing rates by using seeds assayed at three polymorphic loci, and found that the multilocus outcrossing rate (t(m)) increased with increasing male frequency (q) (t(m) = 0.69 to 0.99, q = 0.11 to 0.59). Fixation indices (F(j)) estimated from these t(m) values ranged from 0.006 to 0.185, and were significantly greater than zero in plots with a low male frequency (q <or = 0.35), but not in plots with intermediate or high male frequencies (q > or = 0.47). However, fixation indices at the late life stage (F(a)) were not significantly different from zero at five loci (F(a) = 0.056 to 0.101, q = 0.11 to 0.61), and the F(a) values were lower than the F(j) values in several of the plots where both values were measured. These results indicate that inbreeding depression substantially decre...Continue Reading

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Citations

Sep 29, 2004·Proceedings. Biological Sciences·Miguel VerdúJohn R Pannell
Mar 12, 2005·The New Phytologist·Lynda F Delph, Diana E Wolf
Aug 23, 2007·Evolution; International Journal of Organic Evolution·Sarah M Eppley, John R Pannell
Oct 13, 2006·Molecular Ecology·Pierre R GerardNathalie Frascaria-Lacoste
Mar 1, 2016·Molecular Ecology·Christine Ewers-SaucedoJohn P Wares

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