ツルボの胞子及び配偶体の形成とカロースの消長

概要

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In addition to the investigation of the formation pattern of spore and gametophyte, the deposition pattern of callose during their formation was investigated in Scilla scilloides. Successive cytokinesis in the microsporocyte followed meiosis and the microspore tetrads were isobilateral or decussate. Microspores developed into pollens. When the pollen was shed, a mitotic division into vegetative and generative nuclei gave rise to the two-celled pollen. The pollen was shed in this two-celled state. The microsporocyte, each cell of the microspore dyad and each of the tetrad were invested with callosic wall. In pollen grain, callose temporarily deposited in the wall separating the generative cell from the vegetative cell. Cytokinesis in the megasporocyte accompanied meiosis and the chalazal megaspore of the linear tetrad developed into an eight-nucleate embryo sac. That is, the embryo sac was formed according to the monosporic eight nucleate Polygonum type of development. The megasporocyte, each cell of the megaspore dyad and each of the tetrad were perfectly invested with callosic wall. No callose was detected in the developing embryo sacs and in the mature embryo sac, though it was temporarily detected in the pollen grains.
横浜国立大学の論文
1986-03-25