Stomata and starch: the dark side of plant water loss | INRAE In other words, the bulk starch content keeps stomata on time, most likely through the sugars generated in the internal tissues of the leaves, which travel to the guard cells to "set the local time"
Leaf starch reserves keep stomata on time - Plantae In addition to the circadian clock, leaf starch is synthesized during the day and broken down at night to generate sugars for energy, thus acting as a transitory metabolic clock
Explain why introducing starch sugar and potassium salt theory of . . . The starch-sugar theory suggests that during the day, when photosynthesis occurs, starch stored in guard cells is converted to sugar This increase in sugar concentration leads to water influx into the guard cells, causing them to swell and the stomata to open
Plant Physiology: Redefining the Enigma of Metabolism in Stomatal . . . Stomata open at the leaf epidermis, driven by solute accumulation in the surrounding guard cells Transmembrane ion transport has long been recognised to contribute to this process A new study makes it clear that guard cells also metabolise starch to accelerate opening
Stomata: Meaning, Types and Mechanism | Plant Physiology In some plants there is no starch present in the guard cells (e g , Allium sp ) Inter-conversion of starch-sugar is very slow and does not satisfactorily explain the quick stomatal movement or responses to water levels