TEMPORAL EVOLUTION OF PHYSIOLOGICAL PARAMETERS USED AS STRESS MARKERS DURING THE EXPOSITION OF Salvinia minima TO HEXAVALENT CHROME

TABERNERO NOELIA ROMINA; PRADO CAROLINA DEL VALLE; CHOCOBAR PONCE SILVANA; PRADO FERNANDO

Tafí Viejo

Jornada; XXXVI Jornadas Científicas Asociación de Biología de Tucumán; 2019

Asociación de Biología de Tucumán (ABT)

It is widely documented that the exposure of plants to heavy metals (HM), induces the appearance of various metabolic and physiological responses with more or less pronounced changes in certain parameters, among which are the phenolic compounds. The objective of this work was to analyze the patterns of temporary accumulation of phenolic compounds (PC) that can be used as stress markers during the removal of Cr(VI) in S. minima plants. For carrying out the tests, S. minina plants were grown in the presence of K2Cr2O7 as a source of Cr(VI) at a concentration of 20 mg.l-1 for 7 days. Soluble phenols (SP) and insoluble phenols (IP) were quantificated with the Folin-Ciocalteu reagent. The results showed that in plants exposed to Cr(VI), the SP decreased due to the effect of the metal independently of the organ analyzed. In turn, the IP showed a pattern of inverse accumulation to that observed for the SP, with a maximum peak of accumulation on day 4. The removal profile coincided with the increase in IP. The results suggest that the PC would be a good marker to be used in the evaluation of the physiological state of S. minima during its exposure to Cr(VI), since its accumulation would constitute an additional mechanism that this plant would have to tolerate the HM and grow in contaminated aquatic environments.