Effects of sex change in maple trees on forest regeneration

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The spatial genetic structure, gene flow through pollination and relatedness between parents of seeds were investigated in an Acer rufinerve population, a dioecious tree. The efficiency of the sex expression, dioecy, was evaluated by estimating selfing rate of bisexual A. rufinerve trees. The A. rufinerve population has a significant spatial genetic structure. The spatially close trees tended to have a similar genotypes. The short-distant gene flows through pollination were dominant, and selfing rate of bisexual trees was high (75%). It means self incompatibility was low in this species. The sex expression, dioecy, would be efficient in A. rufinerve to avoid selfing and inbreeding depression.