樟子松大孢子的发生和雌配子体的形成过程

樟子松大孢子母细胞经一系列变化，发育成雌配子体。在哈尔滨地区樟子松大孢子母细胞于每年6月8～14日形成，接着进行减数分裂，于6月16～20日形成大孢子。随着大孢子核的分裂，进入游离核时期，并于次年5月28日～6月4日形成细胞壁，幼雌配子体中出现颈卵器原始细胞，它分裂一次形成颈细胞和中央细胞。6月7～9日中央细胞分裂成卵细胞和腹沟细胞，6月13～15日颈卵器发育成熟。成熟的颈卵器含有颈细胞、腹沟细胞和卵细胞，但颈细胞和腹沟细胞已经退化。

The emergence of macrospore and the formation of female gametophyte in Pinus sylvestris var. mongolica

Macrospore metrocyte of Pinus sylvestris var.mongolica developed to female gametophyte containing female gamete-egg by a series of changes.Macrospore metrocyte formed on June 8~14 every year,then made a meiosis and macrospore formed on June 16~20 in Harbin.With the nucleus divisions of macrospore,macrospore went to the phase of free nuclei and the cell wall formed from May 28 to June 4 in the next year.The archegonial initial cell emerged in young female gametophyte and the neck cell and the central cell formed after it divided once.Central cell was divided to egg cell and ventralcanal cell on June 7~9,archegonia developped to mature on June 13~15.The mature archegonia contained neck cell,ventralcanal cell and egg cell,but neck cell and ventralcanal cell has degenerated.