SciELO - Scientific Electronic Library Online

vol.28 issue2Quantification of Diplodia macrospora and D. maydis inoculum in crop residues, in the air, and its relationship with infection of corn kernelsReaction of corn hybrids to white ear rot author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Fitopatologia Brasileira

Print version ISSN 0100-4158On-line version ISSN 1678-4677


NOJOSA, Gutemberg Barone A. et al. Phenols and oxidative enzymes in resistant and susceptible cocoa clones against Crinipellis perniciosa. Fitopatol. bras. [online]. 2003, vol.28, n.2, pp.148-154. ISSN 0100-4158.

The levels of total soluble phenols and the activity of the oxidative enzymes polyphenol oxidases and peroxidases were studied in healthy leaf tissue of cocoa (Theobroma cacao) clones SCA 6, TSH 1188, TSH 565, TSH 516, EET 397, EET 62, TSA 641, SIAL 505, RIM 106, RIM 52, SIC 24 and UF 613, for the purpose of detecting the possible resistance mechanism(s) to Crinipellis perniciosa. The total soluble phenol content of T. cacao clones with resistance to C. perniciosa was generally higher than in the susceptible clones, which may contribute to defense against the pathogen. The activity of polyphenol oxidases was lower in the resistant clones compared to the susceptible ones. The activity of peroxidases in mature leaves was lower in resistant clones, but when considering young leaves it was not possible to establish a clear relation between the activity of this enzyme with resistance. The levels of soluble phenols and the activity of oxidative enzymes studied were inversely correlated in the majority of the studied clones, suggesting a possible inhibition of the oxidative enzymes by phenols.

Keywords : peroxidases; polifenoloxidases; vassoura-de-bruxa; cacau; resistência.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License