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Multifaceted tests evaluate calcium oxalate crystal production and function in riverbank grape, suggesting new roles in calcium regulation.
Our multifaceted test of the formation and function of calcium oxalate crystals in riverbank grape demonstrates that an abiotic factor (i.e., soil calcium) is a relatively stronger determinant of crystal production and that, contrary to hundreds of years of speculation on their function, these crystals do not seem to mediate plant-insect herbivory in all plant taxa. Instead, the alternative hypothesis of calcium regulation was supported by our experimental evidence.
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Graham et al. (2026) studied this question.
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