From Microspore to Embryoid: Faces of the Angiosperm Pollen Grain
From Microspore to Embryoid: Faces of the Angiosperm Pollen Grain
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从小孢子到胚状体：被子植物花粉粒的面孔
DOI：
10.1007/978-94-009-2103-0_32
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
V. Raghavan
中科院分区：
文献类型：
--
作者：
V. Raghavan
在被子植物有性生殖的背景下，花粉粒代表了一个短暂的雄配子体阶段的开始，并提供了将精子运送到卵子附近的载体。在一定的实验条件下，某些被子植物的花粉粒遵循不同的发育程序，导致产生胚状结构或胚状体和愈伤组织。因此，被子植物的花粉发育就像一枚硬币的两面：在正常的生活中，花粉粒被编程为终末分化;在实验条件下，它走上了一条通往永生的道路。花粉粒能够表现出两种不同的表型，这证明了花粉粒是一种模式发育系统。
In the context of sexual reproduction in angiosperms, the pollen grain represents the beginning of a short-lived male gametophytic phase and provides the vehicle for the delivery of sperm to the vicinity of the egg. Under certain experimental conditions, pollen grains of some angiosperms follow a different developmental program leading to the production of embryo-like structures or embryoids and calluses. Thus, pollen development in angiosperms is like two faces of the same coin: during its normal life the pollen grain is programmed for terminal differentiation; under experimental conditions it embarks on a pathway leading to immortality. It is a testament to the pollen grain as a model developmental system that it is able to display two dissimilar phenotypic forms.