Calcium oxalate crystal production in different plant communities of the Pampean Plain: a comparative analysis.

FERNÁNDEZ HONAINE, MARIANA; ALTAMIRANO, STELLA MARIS; BORRELLI, NATALIA; BENVENUTO, MARIA LAURA; OSTERRIETH, MARGARITA

Encuentro; 10 International meeting on phytolith research; 2016

Calcium oxalate crystals (COC) are the most prevalent and widely distributed mineral de-posits throughout the families of higher plants. COC were analyzed in vegetative organs andfruits of 13 species from dierent plant communities of the Pampean Plain: forests (Acaciamelanoxylon, Celtis ehrenbergiana, Eucalyptus globulus), agroecosystems (Glycine max), andwetlands (Alternanthera philoxeroides, Bidens laevis, Hydrocotyle bonariensis, Ludwigia pe-ploides, Mikania parodii, Polygonum hydropiperoides, Ranunculus apiifolius, Rumex crispusand Typha latifolia). Organs were placed in an ultrasound bath and washed with distilled wa-ter to remove possible mineral contaminants. Afterwards, diaphanization, clearing of tissueswith 50% sodium hypochlorite and cross sectioning were realized. The material was mountedwith gelatin-glycerin and COC were identied and described with optical, polarization andscanning electron microscopes. Crystal density was calculated and the composition of thecrystals was analyzed by X-ray dispersive spectroscopy (EDS). Statistical analyses (Kruskal-Wallis test and Principal Component Analysis) were made in order to compare COC size andproduction between communities, species and organs. Druses were observed in C. ehrenber-giana, E. globulus, A. philoxeroides, H. bonariensis, L. peploides, P. hydropiperoides, and R.crispus. Raphide bundles were present in L. peploides and T. latifolia; and prismatic crystalsin A. melanoxylon, E. globulus, H. bonariensis, L. peploides and R. crispus. Calcicationmainly occurred in parenchymatous tissue. No COC were observed in B. laevis, M. parodiiand R. apiifolius. A single crystal morphology was observed per organ, except in leaves ofL. peploides and E. globulus, which present both druses and raphides, or druses and pris-matic crystals, respectively. In fruits, only prismatic crystals were observed independentlyof the morphology produced in the vegetative organs. The species analyzed had signicantdierences in the size of the COC (H: 443.5, p< 0.001). Particularly, some aquatic species(A. philoxeroides, L. peploides, P. hydropiperoides and R. crispus), given the great size oftheir druses (36-58m), could not be dierentiated among them (p> 0.05). Consideringeach species, the fruits had smaller COC (5-11m) than the vegetative organs (14-210m,p< 0.001). The COC density was signicantly dierent between communities, species andorgans, and allowed to distinguish the community and the organs with greater productionof COC. Thus, the tree species were grouped together with the fruits of the species analyzedgiven their greater COC density: 9167-28308 and 1112-18531 crystals/mm2, respectively.Inside this group, C. ehrenbergiana and E. globulus have more anity because they producedruses, unlike A. melanoxylon and the fruits analyzed that produce prismatic crystals. It wasnot possible to discriminate between the aquatic community (7-250 crystals/mm2) and thecrop (340 crystals/mm2). The description and quantication of COC allowed to distinguishamong dierent plant communities, species and organs. The fruits showed the smallest sizeand the highest density of crystals. This particular pattern ensures the normal growth anddevelopment of the embryos, since crystals act as a calcium source, prevent damage frominsects and allow reproductive success of the species