Hornwort stomata walls are not built for movement
Assiry A. (2019)
In Botany One March 20, 2019 –
Guard cell walls are built to resist bending and deformation to open and close the pore. Pectins provide flexibility and resilience to walls; in particular arabinans and unesterified homo-galacturonans are required for stomata function.
Merced and Renzaglia use immunolabelling to investigate how wall architecture and pectin composition of Arabidopsis stomata compare to the unresponsive stomata of the hornwort Phaeoceros (Notothyladaceae, Anthocerotophyta).