INVESTIGADORES
PRADO carolina Del Valle
artículos
Título:
Metabolic interconnectivity among alternative respiration, residual respiration, carbohydrates and phenolics in leaves of Salvinia minima exposed to Cr(VI)
Autor/es:
CAROLINA PRADO, MARIANA ROSA, EDUARDO PAGANO, FERNANDO PRADO
Revista:
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Año: 2013 vol. 87 p. 32 - 38
ISSN:
0098-8472
Resumen:
Floating and submerged leaves of the aquatic fern Salvinia minima were used to analyze a metabolicinterconnectivity among mitochondrial alternative respiration, residual respiration (Rresp), carbohydratemetabolism and soluble phenolics (SP) accumulation occurring under Cr(VI) stress. Treatment with Crenhanced alternative pathway capacity (APcap) and (Rresp) in both leaf types. APcap/Tresp ratio revealedan increasing relative contribution of the alternative respiration to total respiration rate under Cr(VI)treatment. Sucrose content increased in Cr-treated leaves, but glucose and starch decreased. Enzymeprofile showed that sucrose synthase (SS) rather than soluble acid invertase (AI) seems to be involvedin sucrose metabolism of Cr-treated plants. Accumulation of SP showed a positive correlation with bothAPcap and Rresp in floating leaves. Decreases of SP in submerged leaves can be explained by an increasedsynthesis of polymerized phenolics. Results provide important new insights about influence of alternativeand residual respirations on the synthesis of phenylpropanoid-derivative compounds. This work couldalso represent the first communication about involvement of the Rresp in defence mechanism of S. minimaagainst Cr(VI) toxicity