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Background  Although the cellulose microfibril organization in guard cell (GC) walls play a crucial role in the mechanism of the stomatal function, recent work showed that matrix cell wall materials are also involved. Especially in the kidney-shaped stomata of the fern  Asplenium nidus , callose actively participates in the mechanism of opening and closure of the stomatal pore.    Scope  The present review briefly presents and discusses recent findings concerning the distribution and role of callose in the kidney-shaped stomata of the dicotyledon  Vigna sinensis  as well as in the dumbbell-shaped stomata of the monocotyledon  Zea mays .    Conclusion  The discussed data support that, in both categories of angiosperm stomata, callose is implicated in the mechanism of stomatal pore formation and stomata function by locally affecting the mechanical properties of the GC cell walls.

Callose: a multifunctional (1, 3)-β–d-glucan involved in morphogenesis and function of angiosperm stomata