Suggested to mediate pollen adhesion to the stigma
References
PCP-A1, a defensin-like Brassica pollen coat protein that binds the S locus glycoprotein, is the product of gametophytic gene expression PCP-A1, a defensin-like Brassica pollen coat protein that binds the S locus glycoprotein, is the product of gametophytic gene expression Plant Cell . 1998 Aug;10(8):1333-47.