Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Crassinucellate ovules are initiated in Taxus, directly from the shoot apex. The rudimentary pollen chamber is formed in the nucellus. A linear tetrad of megaspores with a functional chalazal megaspore is formed. A free-nuclear stage is characteristic at the beginning of megagametophyte development. Archegonia without ventral canal cell are solitary or in complexes. The embryo has a very long suspensor even after maturation. Two types of polyembryony have been revealed: i) embryogenic redifferentiation of suspensor cells and ii) cleavage of embryonic region in the early embryo. In the northern temperate climate of St. Petersburg one month delay in development of reproductive structures has been noted.
Язык оригинала | английский |
---|---|
Страницы (с-по) | 135-139 |
Число страниц | 5 |
Журнал | Acta Societatis Botanicorum Poloniae |
Том | 65 |
Номер выпуска | 1-2 |
Состояние | Опубликовано - 1996 |
Опубликовано для внешнего пользования | Да |
ID: 39387974