论文部分内容阅读
成熟花粉粒不仅能在柱头上萌发,人工培养在适当的条件下也可以离体萌发。这对于研究花粉管的生长及外界因素对其影响有一定的意义。在十九世纪随着显微镜的使用和细胞培养技术的应用,人们对花粉粒萌发需要的件条进行了探索,发现花粉萌发一般需要以下条件:1、糖类:糖分是花粉萌发的主要营养物质,同时又起到调节渗透压的作用。对大多数花粉来说,糖分是不可缺少的条件。2、水分:是花粉萌发和花粉管生长的必要条件。有些种类的花粉无水也能正常萌发,但大多数种类由于外部渗透压过低,水会引起花粉膨胀破裂。因此,除了水份以外,
Mature pollen grains not only germinate on the stigma, but artificial germination can also germinate in vitro under appropriate conditions. This is of some significance for the study of pollen tube growth and external factors on its impact. In the nineteenth century, with the use of microscopy and cell culture technology, researchers have explored the pieces of pollen grains needed for germination, and found that pollen germination generally requires the following conditions: 1. Sugar: Sugar is the main nutrient for pollen germination , At the same time play a role in regulating the osmotic pressure. For most pollen, sugar is an indispensable condition. 2, moisture: the pollen germination and pollen tube growth necessary conditions. Some species of pollen can germinate without water, but water can cause the pollen to expand and rupture in most species due to low external osmotic pressure. Therefore, in addition to water,