Western white pine (Pinus monticola Dougl.) reproduction:: II.: Fertilisation and cytoplasmic inheritance

被引:14
|
作者
Bruns, D [1 ]
Owens, JN [1 ]
机构
[1] Univ Victoria, Ctr Forest Biol, Victoria, BC V8W 3N5, Canada
来源
SEXUAL PLANT REPRODUCTION | 2000年 / 13卷 / 02期
基金
加拿大自然科学与工程研究理事会;
关键词
white pine; egg; sperm; fertilisation; cytoplasmic inheritance; proembryo;
D O I
10.1007/s004970000041
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Fertilisation and proembryo development are described from transmission electron micrographs emphasising the origin and fate of the maternal and paternal mitochondria and plastids. During central cell and egg development mitochondria migrate toward the nuclei, forming a perinuclear zone consisting predominantly of maternal mitochondria and polysomes. At the same time, maternal plastids transformed and at fertilisation are excluded from the neocytoplasm. The pollen tube releases two sperm nuclei into the egg with cytoplasm from the generative cell and the tube cell. The leading sperm nucleus fuses with the egg nucleus and a small number of paternal mitochondria and plastids are taken into the perinuclear zone. The second sperm nucleus degenerates. As the zygote nucleus undergoes mitosis followed by free nuclear division and nuclear migration to the chalazal end of the archegonium, maternal and paternal organelles intermingle within the neocytoplasm. The result is paternal inheritance of plastids and biparental, but predominantly maternal, inheritance of mitochondria. This pattern is consistent within the Pinaceae but differs from some other conifer families.
引用
收藏
页码:75 / 84
页数:10
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