Abstract
In this study, we linked Ca speciation with isotope composition in plants. To do this, we performed leachate experiments to access the soluble Ca, structurally bound Ca and insoluble Ca (i.e., water and weak acid resistant) within beech tree organs (Fagus sylvatica L.). Ca isotopic measurements were combined with infrared spectroscopy and calcium oxalate biomineralization identification. The results from our study indicate that bark and leaves are the most enriched in monohydrated calcium oxalate crystals (whewellite), which are observable in parenchyma and sclerenchyma tissues, whereas roots and wood are enriched in structurally bound Ca. Our leaching experiments also show decreasing δ44/40Ca isotopic signatures in the order of soluble Ca > structurally bound Ca > insoluble Ca. This finding implies that because leaves degrade faster than wooden organs and because Ca linked to pectate decomposes faster than Ca linked to oxalate crystals, differential Ca isotopic signatures are expected to be observed during litter degradation.
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Colin Fourtet and Eric Pelt are acknowledged for their technical assistance in the laboratory. The manuscript benefitted from constructive reviews by Thomas D. Bullen and an anonymous reviewer. We also thank the editor Jonathan Sanderman for his handling of the manuscript. This project was financially supported by funding from the French CNRS-INSU programme “EC2CO-Cytrix”, by the ANPCyT - Argentine (PICT 1583) and the Mar del Plata University - Argentine (EXA 741/2015). This work is an EOST-LHyGeS contribution.
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Glossary
- Apoplast
-
Extracellular continuum formed by the pectocellulosic walls and the void spaces between the plant cells. Water and solutes can navigate through non-selective passive diffusion
- Chlorenchyma
-
A chloroplast-containing parenchyma tissue, such as mesophyll and other green tissues (Fahn 1990)
- Chloroplast
-
organelle in which photosynthesis occurs; contains chlorophylls among other pigments (Fahn 1990)
- Cortex
-
The tissue between the vascular cylinder and epidermis of the axis (Fahn 1990)
- Cytoplasm
-
Material within a living cell, excluding the cell nucleus and is approximately 80% water
- Endoplasmic reticulum
-
Type of organelle in eukaryotic cells that, among others, synthesizes proteins
- Epidermis
-
The outermost cell layer of primary tissues of the plant, sometimes comprising more than one layer (Fahn 1990)
- Idioblast
-
Specific cell which is clearly distinguished from the other cells of the tissue in which it appears, either by size, structure or content (Fahn 1990)
- Mesophyll
-
The photosynthetic parenchymatous tissue situated between the two epidermal layers of the leaf (Fahn 1990)
- Parenchyma tissue
-
Ground tissue composed of living cells which may differ in size, shape and wall structure (Fahn 1990)
- Phloem
-
The principal tissue responsible for the transport of assimilates in the vascular plants (Fahn 1990)
- Sclerenchyma tissue
-
A supporting tissue composed of fibres and or sclereids
- Vacuole
-
Eukaryotic cell organelle. In plant cells, this constitutes 80–90% of the volume and weight. It contains mostly water but also organic molecules
- Vascular bundle
-
A strand of conducting tissue in plants (Fahn 1990)
- Xylem
-
The tissue mainly responsible for conduction of water in vascular plants (Fahn 1990)
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Schmitt, AD., Borrelli, N., Ertlen, D. et al. Stable calcium isotope speciation and calcium oxalate production within beech tree (Fagus sylvatica L.) organs. Biogeochemistry 137, 197–217 (2018). https://doi.org/10.1007/s10533-017-0411-0
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DOI: https://doi.org/10.1007/s10533-017-0411-0