Comparative study of two salvinia species exposed to Cr (VI). Differential physiological responses

PRADO, CAROLINA; CHOCOBAR PONCE, SILVANA; PAGANO, EDUARDO; ROSA, MARIANA; PRADO, FERNANDO

Corrientes

Congreso; XXXI Reunión Argentina de Fisiología Vegetal; 2016

Sociedad Argentina de Fisiología Vegetal

Effect of two Cr(VI) concentrations was assessed in Salvinia rotundifolia and Salvinia minima by measuring biomass, photosynthetic pigments, Cr accumulation, malondialdehyde, membrane stability index (MSI), thiols (TT, NPT and PBT), and phenolics (SP and IP). Biomass in S. minima decreased at highest Cr(VI) concentration, but there were no changes in S. rotundifolia. The former accumulates more metal in fronds, but the latter in lacinias. Results also showed that S. minima translocates more Cr to fronds than S. rotundifolia, but at the whole plant level higher accumulation occurred in this last. Tolerance index was higher in S. rotundifolia. Chl b and carotenoids decreased upon exposure to high Cr(VI) concentration in both species. Cr(VI) did not enhance MDA accumulation and had no impact on MSI values. Thiols showed different patterns between species. IP and NPT were higher in lacinias of S. rotundifolia accumulating more Cr than S. minima lacinias. SP and NPT were higher in S. minima fronds. This may indicate that these species can cope with Cr(VI), either through metal complexation and/or metal reduction or by scavenging of ROS derived from oxidative stress. Based on Cr accumulation and biomass production, S. rotundifolia seems more suitable to remove Cr(VI) from polluted waters.