图1. 拟南芥花粉与柱头的相互作用
1: 花粉落到柱头上; 2, 3: 花粉黏附与水合; 4: 花粉萌发。花粉黏附到柱头上之后, 形成花粉足(红色部分), 花粉足是花粉与柱头之间信号交流的通道。目前已知在花粉中参与水合的因子包括花粉外壁脂质以及相关的脂质酶、脂质结合蛋白和PCP-Bs小肽等。柱头中涉及水合的因子包括钙离子和Exo 70A1 (囊泡运输)等。

Figure 1. Pollen-stigma interaction in Arabidopsis
1: Pollen landing on the stigma; 2, 3: Pollen adhesion and hydration; 4: Pollen germination. After pollen adhesion a foot structure (red) established, which bridges pollen and papillar cells for the signaling between them. Currently, the known pollen factors involved in its hydration include pollen exine lipid and relevant lipidase, lipid binding proteins, and PCP-Bs, etc. The stigma factors involved in the hydration include cal-cium ion and Exo70A1 (vesicle trafficking), etc.