abstract
This work aimed to study the effects of commercial doses of the fungicide, Mancozeb, on the photosynthetic apparatus of lettuce young leaves (YL) and expanded leaves (EL). Seven days after Mancozeb application, chlorophyll a fluorescence, pigment contents, lipid peroxidation, and proline content were evaluated. Independently of leaf age, Mancozeb treatment reduced the efficiency of photosystem II photochemistry, increased the nonphotochemical quenching and proline content, decreased pigment contents, and induced lipid peroxidation. Moreover, EL showed a more stable photosynthetic apparatus, less prone to oxidative damages compared with YL. The parameters measured proved to be good markers for the rapid and preliminary diagnosis of fungicide toxicity.
keywords
ELECTROLYTE LEAKAGE; ANTIOXIDANT ENZYMES; PHOTOSYNTHESIS; FLUDIOXONIL; PESTICIDES; PHYSIOLOGY; STRESS; PLANTS; OZONE; YIELD
subject category
Plant Sciences
authors
Dias, MC; Figueiredo, P; Duarte, IF; Gil, AM; Santos, C
our authors
Ana Maria Pissarra Coelho Gil
Associate Professor with Aggregation
Iola Melissa Fernandes Duarte
Principal Researcheracknowledgements
This work was supported by Portuguese Foundation for Science and Technology through a post-doctoral fellowship of M.C. Dias (SFRH/BPD/41700/2007). A.M. Gil acknowledges funding from the European Regional Development Fund-FEDER through the Competitive Factors Thematic Operational Programme-COMPETE and the Foundation for Science and Technology-FCT, Portugal (PEst-C/CTM/LA0011/2011).