larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte 同义词：macrospore,
Megaspores, also called macrospores, are a type of spore that is present in heterosporous plants. These types of plants have two spore types, megaspores and microspores.
例句与用法
1.
The gametophyte is derived from the product of a reduction division in the megaspore mother cell . 该配子体是由大孢子母细胞进行减数分裂而来。
2.
Of the four products of a megaspore mother cell , three usually abort 在大孢子母细胞分裂产生的四个孢子中，三个会解体消失。
3.
In theterosporous species , a distinction is usually made between megaspore mother cells and microspore mother cells 在异型孢子体种类中，可区分为大孢子母细胞和小孢子母细胞。
4.
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，在第一次减数分裂后，大孢子母细胞的染色体仍在一个细胞中，形成一个再组核。
5.
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 胚胎学观察揭示大孢子与胚囊内的卵细胞、助细胞和反足细胞均有可能在培养中启动分裂，通过胚状体或愈伤组织形成单倍体植株。
6.
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 还发现了大孢子母细胞合点端的核膜先于珠孔端的消失，并且珠孔端3个大孢子的死亡时间不同，与相邻细胞的关系也不同，进而讨论了这些现象的生物学意义。
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