x

megaspore

uploads/megaspore.jpg

megaspore n.【植物；植物學】大孢子。adj.-sporic

n. 【植物；植物學】大孢子。 adj. -sporic “megaspore competition“ 中文翻譯：   大孢競爭; 大孢子競爭“megaspore haustorium“ 中文翻譯：   大孢子吸器“megaspore membrane“ 中文翻譯：   大孢子壁“megaspore nucleic“ 中文翻譯：   大孢子核“megaspore tetrad“ 中文翻譯：   四分大孢子“megaspore mother cell“ 中文翻譯：   大孢子母細胞“megasporangium“ 中文翻譯：   n. (pl. -gia ) 【植物；植物學】大孢子囊。 “megaspilaion“ 中文翻譯：   邁加斯皮萊翁“megaspheric individual“ 中文翻譯：   顯球型個體“megaspheric form“ 中文翻譯：   顯球型“megasphaere cerevisiae“ 中文翻譯：   巨球菌

megasporophyll

It was also found that the nuclear envelope disappeared earlier at the micropylar end than that at the chalazal end . the speed of the programmed cell death were different in three nonfunctional megaspores at the micropylar end and their relationships with the neighboring cells were also different . the biological significance was discussed about these phenomenon 還發現了大孢子母細胞合點端的核膜先于珠孔端的消失，并且珠孔端3個大孢子的死亡時間不同，與相鄰細胞的關系也不同，進而討論了這些現象的生物學意義。

Embryological studies reveal that megaspore and such cells as egg , synergid and antipodals in mature embryo sac initiate the division of forming haploid plants through embryogenesis or callus formation 胚胎學觀察揭示大孢子與胚囊內的卵細胞、助細胞和反足細胞均有可能在培養中啟動分裂，通過胚狀體或愈傷組織形成單倍體植株。

In dandelion ( taraxacum ) , for example , the chromosomes of the megaspore mother cell remain in one cell after the first meiotic division , forming a restitution nucleus 例如在蒲公英中，在第一次減數分裂后，大孢子母細胞的染色體仍在一個細胞中，形成一個再組核。

In theterosporous species , a distinction is usually made between megaspore mother cells and microspore mother cells 在異型孢子體種類中，可區分為大孢子母細胞和小孢子母細胞。

Of the four products of a megaspore mother cell , three usually abort 在大孢子母細胞分裂產生的四個孢子中，三個會解體消失。

The gametophyte is derived from the product of a reduction division in the megaspore mother cell . 該配子體是由大孢子母細胞進行減數分裂而來。