カラスビシャクの栽培に関する研究(第1報) : 種子形成について

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The biological process of seed formation of Pinellia ternata BREIT. was studied embryologically. The anther is tetrasporangiate. The wall development is of the monocotyledonous type. The tapetum is of the periplasmodial type and uninucleate. The meiotic divisions in the microspore mother cell are successive. The pollen tetrads are isobilateral, decussate and T-shaped. The mature pollen grains are spherical and have no germ pore. They are shed at the 3-nucleate stage. Unilocular ovary usually contains a single orthotropous, bitegmic and tenuinucellate ovule. The female archesporium is hypodermal and single-celled. It functions directly as a megaspore mother cell and undergoes meiotic division to give linear or occasionally T-shaped tetrads. The chalazal megaspore produces an eight nucleate embryo sac of the Polygonum type. The endosperm development is of the cellular type. At first, the primary endosperm nucleus is divided transversely into a micropylar and a chalazal chamber. Subsequently, the nucleus of the micropylar chamber repeats divisions to produce the entire cellular part of the endosperm, while the chalazal remains undivided and functions as a haustorium. After fertilization, the embryo develops from the egg cell. Neither the embryos developing from the nucellar and integmentary cells nor diploid embryo sac is observed. These data indicate that the seeds of P. ternata BREIT. are formed via sexual reproduction.
日本生薬学会の論文
1995-09-20

カラスビシャクの栽培に関する研究(第1報) : 種子形成について

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