ibclogo XVI International Botanical Congess


Abstract Number: 2551
Poster No. = 707


INBREEDING DEPRESSION IN A HIGHLY SELFING TREE, MAGNOLIA HYPOLEUCA, IN JAPAN.


Kiyoshi Ishida. FFPRI, Hitsujigaoka7, Sapporo, Japan.


There are few empirical studies on the inbreeding depression in highly selfing woody plants. I examined the inbreeding depression in five populations of a highly selfing tree, Magnolia hypoleuca. The estimated outcrossig rate at the seed stage ranged from 0.1 to 0.6 in the populations. Estimates of inbreeding depression expressed after seed maturation for the same populations were high, ranging from 0.9 to 1.0. In one of these populations, the outcrossing rate at the zygote stage and the magnitude of inbreeding depression during seed maturation were 0.2 and 0.7, respectively. The glasshouse experiment also revealed significant inbreeding depression in seedling growth. It is suggested that the high total inbreeding depression interferes with the purging of the early component of inbreeding depression in the highly selfing population of M. hypoleuca.


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