"富有"における胚のうおよび種子の発育異常について

概要

論文の詳細を見る
Embryo sacs and seeds were histologically observed to clarify the cause of seed abortion in Japanese persimmon cv. Fuyu. The embryo sac mother cell (EMC) was differentiated 24 days before anthesis, but the abnormal ones degenerated about 4 days later. Sixteen days prior to anthesis the average percentage of degenerated EMC was about 23%. Tetrasporangia or the 4-celled embryo sac was observed 12 to 14 days before anthesis but 2.5% of them immediately degenerated. Among the multiple embryo sacs observed in an ovule, at least one had the ability to become fertilized. Therefore, this abnormality does not significantly affect seed abortion.<BR>During seed development, two types of abnormal seeds were observed: 1) In 23% of ovules, the endosperm either did not undergo free nuclear division or the process was delayed. This is attributed to a male gamete not uniting with the polar nuclei; and 2) the 3n endosperm is aborted in about 21% of the ovules; the frequency of this anomaly increases about 15 days after anthesis.
園藝學會の論文