甘蓝型油菜珠孔与胚囊的超微结构研究

甘蓝型油菜的外珠孔基本上为开放结构，内珠孔为闭合结构。胚囊成熟时反足细胞已退化，仅由二个助细胞、一个卵细胞、与一个中央细胞组成。助细胞极性不明显，二个助细胞在花粉管到达前均显示同等退化迹象。卵细胞极性明显。中央细胞中含结构独特的质体。受精前，卵与中央细胞的质膜之间含有特殊的电子致密物质。

Ultrastructural Studies on Micropyle and Embryo SAC in Brassica Napusl.

Gametophytes of nine species in Athyriaceae i.e. Athyrium sinense, A. dalingense, A. multidentatum (ineluding two forms with green and purple stipe respectively), Lunathyrium pycnosorum, Dryoathyrium coreanum, Cystoptreris sudetica, Pseudocystopteris spinulosa, Gymnocarpium dryopteris and Allantodia crenata were cultrred and analyzed using easterase isoenzyme electrophoresis. The enzyme banding patterns show various differences each other among them. Within the species Athyrium multidentatum there are also obvious differences between two forms with green and purple stipe, that is to say, this two forms show different enzyme banding patterns. So it is suggested that if the green stipe form is regarded as the type species of Athyrium multidentatum, the purple stipe form may be regarded as its forma.