Water stress and senescence increase calcium oxalate crystals and decrease their solubility in amaranth leaves
Calcium oxalate (CaOx) crystals are widespread in plants, yet their physiological roles remain debated. Although calcium sequestration is the most widely accepted function, some studies propose that CaOx crystals can serve as a carbon source, implying calcium release. These studies report decreases in CaOx crystals under water stress and other CO2-limiting conditions, suggesting that crystals are…
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