Fertilization and embryogeny in Agapanthus praecox ssp. orientalis (Leighton) Leighton
Fertilization and embryogeny in Agapanthus praecox ssp. orientalis (Leighton) Leighton
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DOI：
10.1007/s00606-010-0378-y
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发表时间：
2011-03
影响因子：
1.9
通讯作者：
Di Zhang;L. Ren;Xiao-hui Shen;Li-huan Zhuo
中科院分区：
文献类型：
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作者：
Di Zhang;L. Ren;Xiao-hui Shen;Li-huan Zhuo
首次报道百子莲的受精和胚胎发生，并对百子莲的胚胎发生特性进行了讨论。主要结果如下：（1）授粉后44-48 h，花粉管进入胚囊，排出两个精子。(2)授粉后50 h左右，精子与卵细胞和极核融合，形成合子和初生胚乳核。受精卵随后进入一个短暂的休眠期。(3)授粉后7天，合子开始分裂。合子的第一次分裂是横向的。(4)胚经过球形胚、杆状胚和单子叶胚。(5)胚柄细胞在球形胚阶段即已退化，寿命较短。(6)胚乳细胞中含有大量的淀粉粒，为胚的发育提供营养。(7)胚发育为Onagrad型，胚乳形成为核型，胚和胚乳发育全过程约需60天。praecoxssp.orientalis. (8)双子叶和单子叶的胚形态发生支持单子叶植物和双子叶植物子叶同源的概念。
Fertilization and embryogeny inAgapanthus praecoxssp.orientalisare described for the first time, and embryogenic characters ofAgapanthusare discussed. The main results are: (1) The pollen tube enters the embryo sac and discharges two sperm 44–48 h after pollination. (2) The sperm fuse with the egg cell and polar nuclei, forming zygote and primary endosperm nucleus, approximately 50 h after pollination. The zygote then enters a short period of dormancy. (3) Seven days after pollination, the zygote starts division. The first division of the zygote is transversal. (4) The embryo undergoes globular stage, rod-shaped stage, and finally forms a monocotyledonous embryo. (5) The suspensor cells are ephemeral and degenerate at the globular embryo stage. (6) Endosperm cells contain massive starch grains as nutrition for embryo development. (7) Embryogeny conforms to the Onagrad type, and endosperm formation is of the nuclear type; the whole process of embryogeny and endosperm development needs approximately 60 days inA. praecoxssp.orientalis. (8) Dicotyledonous together with monocotyledonous forms of embryo morphogenesis inAgapanthussupports the concept of homology of monocots and dicot cotyledons.