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 оригиналаанглийский
Страницы (с-по)135-139
Число страниц5
ЖурналActa Societatis Botanicorum Poloniae
Том65
Номер выпуска1-2
СостояниеОпубликовано - 1996
Опубликовано для внешнего пользованияДа

    Предметные области Scopus

  • Прикладная ботаника

ID: 39387974