Formation, morphology, and germination of pollens in <I>Aesculus turbinata</I> Blume.

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  • トチノキの花粉の形成, 形態および発芽
  • トチノキ ノ カフン ノ ケイセイ ケイタイ オヨビ ハツガ

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The formation, development and morphology of pollen grains and the mechanism of pollen germination in Aesculus turbinata Blume were investigated as one of the fundamental studies for promoting the fruit bearing rates. The meiosis of pollen mother cells (PMCs) started in the end of April, and pollen tetrads were formed in the begining of May. The period of meiosis was about one week. The meiosis of PMCs was the pre-reduction type, and the irregular meiotic division was not observed. Immature pollen grains after separation from tetrads grew rapidly, and they did mitotic division and developed into the mature pollen grains containing a vegetative nucleus and a generative nucleus. The mature pollen grains were prolate in shape and the tricolporate pollen having three germinal furrows. One germinal pore existed in the center of the germinal furrow. And a rudiment of pollen tube was observed in the intine of mature pollen grains. When pollen grains were sown on an artificial germination medium, the elongation of a pollen tube from the germinal pore was observed in 5 min. It is suggested that this quick pollen germination is due to the existence of the pollen tube rudiment in the intine of pollen grains.

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