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Differentiation of the male nucleus receptor apparatus on the female nucleus of the gymnosperms.

裸子植物雌性核上雄性核受体装置的分化。

基本信息

批准号：
06640858
负责人：
HORI Terumitsu
金额：
$ 1.41万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06640858/
关键词：
Cycas Ginkgo male nucleus receptor apparatus gymnosperm sexual reproduction fertilization Cyeas vevoluta

项目摘要

In this study the developmetnt and differentiation of the male nucleus receptor apparatus were investigated in two gymnosperms, Cycas revoluta and Ginkgo biloba. The apparatus functions as a specialized receptor for the acceptance of the male nucleus and as a site of fusion of the gametangial nuclei during fertilization. It is a depression of the nuclear envelope which is frilled with many fine fuzzy foldings of the nuclear membrane. In the egg nucleus of Cycas the apparatus firstly differentiate at its lateral side with regard to the direction of nuclear migrrtion towards the cell center. Finally it locates at the anterior region of egg nucleus facing the neck cells of the archegonium. After fusion of the sperm and egg cells the male nucleus migrates towards the female nucleus in the egg cytoplasm and is accomodated into depression of the female nucleus. The apparatus of G.biloba differentiates during the migration of male nucleus toward the female nucleus after fusion of both reproductive cells. The difference of behavior of the apparatus in these two plants is probably effected by different sizes of egg cells ; the female nucleus of Cycas is tremendously large, measuring more than 2 mm logn and 1-1.5 mm wide, while it measures approximately 350 mum in diameter. Therefore, distance of the nuclear migration in the egg cytoplasm is conspicuously long in the former and shot in the latter. According to comparison of cell size of egg cells and fusion manner of gametangial nuclei formation of the identical structure is expected in plants of the family Pineaceae.

本文研究了苏铁和银杏两种裸子植物雄核受体器的发育和分化。该器作为接受雄性核的专门受体和受精过程中配子囊核的融合部位发挥作用。它是核膜的凹陷，核膜上有许多细小的模糊褶皱。在苏铁卵核中，相对于核向细胞中心迁移的方向，卵核中的器官首先在其外侧分化。最后位于卵核前部，面向颈卵器颈细胞。精卵细胞融合后，雄核在卵细胞质中向雌核迁移，并被雌核的凹陷所容纳。银杏生殖细胞融合后，雄核向雌核迁移过程中，生殖器发生分化。在这两种植物中，该装置的行为差异可能是受卵细胞大小不同的影响;苏铁的雌核非常大，测量超过2 mm logn和1-1.5 mm宽，而它的直径约为350 μ m。因此，核在卵细胞质中的迁移距离前者明显较长，后者较短。根据卵细胞大小和配子核融合方式的比较，认为松科植物中可能形成相同的结构。