(A) and (B) Calcofluor-stained hypocotyl cross-sections of 4-day-old dark-grown wild-type (A) and prc1-1 (B) seedlings. The top arrow indicates an incomplete wall and the bottom arrow indicates an abnormally filled cell in a prc1-1 hypocotyl section.
(C) Congo Red–stained section of a prc1-1 hypocotyl cell in which the incomplete cell wall stubs are connected by a thin structure (arrow).
(D) Calcofluor-stained section through a prc1-1 immature embryo. No incomplete wall or cell filled with stained material was observed.
Bars in (A) and (B) = 100 µm; bar in (C) = 30 µm; bar in (D) = 60 µm. [from Fagard et al. 2000]