The starch-deficient plastidic PHOSPHOGLUCOMUTASE mutant of the constitutive crassulacean acid metabolism (CAM) species Kalanchoë fedtschenkoi impacts diel regulation and timing of stomatal CO2 responsiveness. - Hurtado-Castano N; Atkins E; Barnes J; Boxall SF; Dever LV; Kneřová J; Hartwell J; Cushman JC; Borland AM (Annals of botany, 2023)