Fig. 9
The process of resin extrusion and collapse of the capitate trichome heads is shown for cannabis genotype MD. Extrusion of resin and formation of droplets are shown by arrows. a, b Secretion from bulbous trichomes. c–e Secretion from capitate trichome heads. f Bulging of the cuticle (arrow) is due to resin secretion from the head. g–i Secretion of resin causes the cuticle to develop a central depression (arrows) and the trichome head to collapse. j–l Resin secretion causes trichome heads to stick to one another (arrows). Scale bars shown in c, f, i, l apply to the preceding images in each row