The molecular ecological effects of exotic trees on native tree populations

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Natural hybridization between exotic L. lucidum and native L. japonicum Thunb. has been a long-term concern in Japan. To reveal the interspecific crossability and the possibility of natural hybridization, we conducted(1) the observation of flowering phenology,(2) the experimental crosses and(3) an AFLP analysis. The hybrids between L. japonicum and L. lucidum do not establish at present, at least in a Kanto region, in Japan. The natural hybridization between these species might be prevented by the difference of flowering time and/or the negative endogenous selection on hybrid seeds or seedlings.