Variations in the flowering time, pollen morphology and fertility of Quercus dentata THUNB., Q. serrata THUNB., Q. mongolica FISCHER var. grosseserrata REHDER et WILSON andtheir intermediate types

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The flowering time, pollen morphology and fertility of three Quercus species and their intermediate types were investigated in the mixed stands of Quercus species of the Hiruzen experimental forest of Tottori University and the neighboring stands. The period of flowering of Quercus species in the Hiruzen area was about 30 days. The flowering progressed in the order of Q. mongolica var. grosseserrta> Q. serrata ?? Q. dentata. However, the overlap of the flowering time was found between the trees of late flowering time of Q. mongolica var. grosseserrata and that of early flowering time of Q. serrata and Q. dentata, and between Q. serrata and Q. dentata. It is suggested that interspecific pollination will occur easily, because different species of the same flowering time neighbor in the mixed stand. The size of pollen grains was in the order of Q. dentata > Q. anguste-lepidota ?? Q. takatorensis ?? Q. mongolica var. grosseserrata >Q. serrata. Abnormal pollen grains, namely, giant and empty pollens were observed at a high percentage in ten trees among 96 trees. As the tree of intermediate types showed the pollen germination percentage above 43%, it is concluded that they will be able to mate between the same or other species.
日本森林学会の論文