Hybridization between two different chloroplast DNA haplotypes of Aucuba japonica, a landscaping and horticultural species
2009
Yano, H.(Tokyo Univ. (Japan)) | Goto, S.
The introduction of native plant species through landscaping and horticulture can enhance the genetic diversity of plant populations in urban areas, but it can also disturb the genetic structure of the remaining native populations. We hand-pollinated two chloroplast DNA haplotypes (Ja/B1) of Aucuba japonica, a landscaping and horticultural plant species. The pollination success rate was calculated as the percentage of fertilized flowers to the total number of pollinated flowers. The average pollination success rate was 82.1% for Ja (female) x Ja (male), 75.3% for Ja x B1, 85.3% for B1 x Ja, and 78.6% for B1 X B1. A generalized linear model revealed no significant effects of paternal haplotype on the pollination success rate, except in the case of one maternal plant. Thus, natural hybridization between an introduced haplotype and a native haplotype can occur and the genetic composition of local populations of Aucuba japonica would cryptically be changed in this way.
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