INVESTIGADORES
PRADO carolina Del Valle
congresos y reuniones científicas
Título:
DIFFERENTIAL RESPONSE IN CARBOHYDRATE PROFILES OF TWO SALVINIA SPECIES GROWING UNDER Cr (VI) AT DIFFERENT pH VALUES
Autor/es:
CHOCOBAR PONCE, SILVANA; PRADO, CAROLINA; ROSA, MARIANA; PRADO, FERNANDO
Lugar:
Tafí del Valle
Reunión:
Congreso; XXXV Jornadas Científicas de la Asociación de Biología de Tucumán; 2018
Institución organizadora:
Asociación de Biología de Tucumán
Resumen:
Cr (VI) commonly appears in many effluents that have different physicochemical characteristics (pH, T°C, etc.) thataffect its availability. When contaminants mobility increases, their effect on plant physiology reveal damage to thephotosynthetic apparatus, cell wall and plasma membrane. This leads, among other things, to alterations inphotosynthates production and growth. Therefore, the objective of this work was to comparatively analyze the effectof Cr(VI) on the carbohydrate content in Salvinia minima and Salvinia rotundifolia exposed to Cr(VI) and grown atdifferent pH values. Plants were cultured for 7 days in K2Cr2O7 solutions buffered at different pH. Carbohydrateswere determined spectrophotometrically. In fronds of S. rotundifolia an accumulation of hexoses was observed underchromium, but the Cr-pH combination inhibited this accumulation, producing minor changes in sucrose content. Asthe pH increased, the fructose levels decreased. On the other hand, the lacinias accumulated both hexoses(particularly glucose) and sucrose. All these variations were supported by alterations in the starch content. In S.minima a similar pattern was observed, but the major hexose was fructose. In this case, the starch accumulated frompH 4 and in the presence of chromium. We concluded that both species respond differentially to chromium and pH,modifying the profiles of soluble sugars that would be directed to different pathways. This would partly account forthe metabolic differences observed in previous work with both Salvinia species