肌动蛋白是一种主要的收缩蛋白,在肌肉细胞中是广泛存在的,而在非肌肉细胞中,如在藻类细胞以及高等植物的根尖细胞、表皮细胞中,也存有肌动蛋白。在花粉萌发过程中,肌动蛋白丝集聚成束,对于花粉管的形成和受精过程有着重要作用。但已有的工作,多数限于动物细胞和植物体细胞中,关于高等植物的生殖细胞中的报道则比较少见。 Actin is a major contractile protein that is widespread in muscle cells and actin in non-muscle cells, such as alveolar cells and apical and epidermal cells of higher plants. During pollen germination, actin filaments accumulate into bundles that play an important role in pollen tube formation and fertilization. However, most of the existing work is limited to animal cells and plant somatic cells, while reports on germ cells in higher plants are relatively rare.