Interspecific crossability and the possibility of natural hybridization between native Ligustrum japonicum Thunb. and exotic Ligustrum lucidum Ait. in Japan.
Interspecific crossability and the possibility of natural hybridization between native Ligustrum japonicum Thunb. and exotic Ligustrum lucidum Ait. in Japan.
复制标题
本地女贞之间的种间杂交性和自然杂交的可能性。
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Kojiro Suzuki
中科院分区：
文献类型：
--
作者：
Y. Kameyama;Y. Kiyota;A. Nakamura;C. Hamano;Kojiro Suzuki
女贞子是一种生长迅速的常绿乔木，原产于中国，已被引入许多国家，主要用于园林、树篱和路边树。外来枸杞与本地枸杞的自然杂交。一直是日本长期关注的问题。为了揭示这些物种间的种间亲和性和自然杂交的可能性，我们观察了开花物候，进行了实验杂交，并进行了AFLP分析。露珠花的花期比日本花晚，花期间隔2 d。实验结果表明，枇杷与lucidum杂交后的果实（种子）数量较少，平均坐果数在0.02 ~ 0.21之间，具体取决于花粉粒采集时间和授粉形态。然而，来自日本关东地区四个研究地点的365个个体的AFLP分析清楚地表明，这些个体都不是杂交个体。因此，我们得出结论，在日本关东地区，目前还没有发生L. japonicum和L. lucidum之间的自然杂交。这些物种的自然杂交可能由于开花时间的差异或杂交种子或幼苗的负内源选择而受阻。
Ligustrum lucidum Ait. is a fast-growing evergreen tree native to China that has been introduced to many countries, mainly for gardens, hedges, and roadside trees. 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 between these species, we observed flowering phenology, conducted experimental crosses, and ran an AFLP analysis. Peak flowering time was later for L. lucidum than for L. japonicum, and the flowering periods were separated by 2 days. A small number of fruits (seeds) was produced by the experimental crosses between L. japonicum and L. lucidum: the mean fruit set ranged from 0.02 to 0.21 depending on the collection time of pollen grains and pollination configuration. However, AFLP analysis of 365 individuals from four study sites in the Kanto region of Japan clearly demonstrated that none of these individuals was a hybrid. Thus, we conclude that natural hybridization between L. japonicum and L. lucidum does not presently occur in the Kanto region of Japan. Natural hybridization of these species might be prevented by the difference in flowering times or by negative endogenous selection on hybrid seeds or seedlings.