Bedinger P A, Hardeman K J, Loukides C A
Biology Department, University of North Carolina, Chapel Hill, NC 27399-3280, USA.
Trends Cell Biol. 1994 Apr;4(4):132-8. doi: 10.1016/0962-8924(94)90068-x.
Pollen grains of flowering plants are highly specialized two- to three-cell gametophytes that deliver sperm to the ovule. This function is achieved as a result of a complex developmental programme, including the coordinated events of meiotic divisions, the production of a unique extracellular matrix, the establishment of cytoplasmic domains, and a determinative asymmetric cell division. After maturation, pollen must interact specifically with the receptive female tissues and germinate a highly polarized pollen tube that rapidly grows through the style to the ovule. Thus, pollen is an excellent model system for the study of meiotic events, cellular organization, cell-cell interactions and polar growth in plant biology.
开花植物的花粉粒是高度特化的二细胞或三细胞配子体,负责将精子传递到胚珠。这一功能是通过一个复杂的发育程序实现的,该程序包括减数分裂的协调事件、独特细胞外基质的产生、细胞质区域的建立以及决定性的不对称细胞分裂。成熟后,花粉必须与接受花粉的雌性组织特异性相互作用,并萌发出高度极化的花粉管,该花粉管迅速通过花柱生长到胚珠。因此,花粉是植物生物学中研究减数分裂事件、细胞组织、细胞间相互作用和极性生长的优秀模型系统。