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Changes in the properties of calcium-carbon inclusions during leaf development and their possible relationship with leaf functional maturation in three inclusion-bearing species.

Protoplasma 2018 August 18
In many plant species, carbon-calcium inclusion (calcium oxalate crystals or cystoliths containing calcium carbonate) formation is a fundamental part of their physiology even necessary for normal growth and development. Despite the long-standing studies on carbon-calcium inclusions, the alterations in their properties during leaf development and their possible association with the maturation of the photosynthetic machinery have not been previously examined. In order to acquire more insights into this subject, we examined three of the most common species bearing abundant inclusions of different types, i.e., Amaranthus hybridus, Vitis vinifera, and Parietaria judaica. Results of our study showed that, irrespective of species and type of inclusion, similar patterns in the alterations of their properties are observed during leaf maturation, except for some differences in cell differentiation and distribution between raphides and druses in Vitis vinifera. As expected, inclusion formation has taken place at very early developmental stages and maximum density was observed in very young leaves. Inclusion properties are changing in a coordinated way with leaf area and these modifications are compatible with the concept that each idioblast or lithocyst "services" a finite number/area of adjacent cells. This tight coordination is also evident at the whole leaf level. Moreover, we observed an association of the properties of carbon-calcium inclusions and gas exchange, suggesting a possible implication of these structures in photosynthesis.

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