@Article{taiwania1993381,226,
AUTHOR = {Wann-Neng Jane, Su-Hwa Tsai Chiang},
TITLE = {Ultrastructure of the zygote in Arundo formosana Hack},
JOURNAL = {Taiwania},
VOLUME = {38},
YEAR = {1993},
ISSUE = {1,2},
PAGES = {26-37},
URL = {https://taiwania.ntu.edu.tw/abstract/223},
ABSTRACT = {The polarity in the zygote of Arundo formosana Hack. differs from that in the egg. This report mainly describes the changes and shift of the cytoplasmic contents in the zygote of Arundo formosana Hack. as observed by both light and electron microscopies. The nuclear fusion in zygote occurs earlier than that in the primary endosperm. The nucleus of the zygote is centrally located and the majority of cytoplasmic organelles become aggregated on one side of the nucleus at the end of nuclear fusion. The new cytoplasmic organelles are formed in great quantities at the micropylar half of the zygote. Mitochondria, endoplasmic reticulum and ribosomes increase more rapidly than other organelles. As the development take place, most organelles as well as nucleus move towards the chalazal pore resulting in the change of polarity in zygote. When the endosperm undergoes nuclear division, electron dense wall materials deposite between the zygote and young endosperm. Wall formation progress from the micropylar pole to the chalazal pole discontinuously. The wall formation completes before the first division of the zygote. The first division in zygote is transverse forming a large basal cell and a small terminal cell. Vacuoles are distributed at the micropylar half of the basal cell and seldom present in the terminal cell. The basal cell contains more dictyosomes and oil drops, whereas the terminal cell contains denser cytoplasm. The cytoplasm of the two-celled proembryo is rich in organelles which are uniformly distributed. Plasmodesmata are found between two cells of proembryo, but not in the walls associated with the two-celled proembryo and developing endosperm.},
DOI = {10.6165/tai.1993.38.26}
}