Hydrogen peroxide generation and lignification by peroxidases from Acacia eburnea infected with Ravenelia esculenta

Ravenelia esculenta is a rust fungus which infects Acacia eburnea producing hypertrophy in the infected organs. We analysed the changes in the reaction patterns of peroxidase from the tissues at progressive disease stages. Peroxidases (POX) from the tissues were analysed for oxidation of reduced nic...

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Veröffentlicht in:Plant, soil and environment soil and environment, 2010-01, Vol.56 (9)
Hauptverfasser: Kuvalekar, A.A.,Modern Coll. of Arts, Science and Commerce, Shivajinagar (India). Dept. of Botany, Gandhe, K.R.,Modern Coll. of Arts, Science and Commerce, Shivajinagar (India). Dept. of Botany
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creator Kuvalekar, A.A.,Modern Coll. of Arts, Science and Commerce, Shivajinagar (India). Dept. of Botany
Gandhe, K.R.,Modern Coll. of Arts, Science and Commerce, Shivajinagar (India). Dept. of Botany
description Ravenelia esculenta is a rust fungus which infects Acacia eburnea producing hypertrophy in the infected organs. We analysed the changes in the reaction patterns of peroxidase from the tissues at progressive disease stages. Peroxidases (POX) from the tissues were analysed for oxidation of reduced nicotinamine adenine dinucleotide (NADH), NADH-dependent hydrogen peroxide (H2O2) generation and polymerization of cinnamyl alcohol, a lignin precursor in plants. The effect of cofactors like Mn2+ and dichlorophenol (DCP) was also studied. Effect of externally added H2O2 on NADH oxidation and cinnamyl alcohol polymerization was analyzed. NADH oxidation and H2O2 generation are accelerated by supplement of cofactors. The cofactor requirements of the two reactions are different. The amount of H2O2 generated varies with disease stages, but the rate of NADH oxidation is comparable. Externally added H2O2 has an accelerating effect on NADH oxidation. Cinnamyl alcohol polymerizing activity of POX increased with disease progression and was strongly inhibited by H2O2. Stimulation of these reactions by cofactors has a physiological significance in terms of susceptibility of the host.
doi_str_mv 10.17221/120/2009-PSE
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NADH oxidation and H2O2 generation are accelerated by supplement of cofactors. The cofactor requirements of the two reactions are different. The amount of H2O2 generated varies with disease stages, but the rate of NADH oxidation is comparable. Externally added H2O2 has an accelerating effect on NADH oxidation. Cinnamyl alcohol polymerizing activity of POX increased with disease progression and was strongly inhibited by H2O2. 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subjects ACACIA
ACACIA EBURNEA
BIOCHEMICAL PATHWAYS
BIOCHEMICAL REACTIONS
CHAMPIGNON
ENFERMEDADES FUNGOSAS
FUNGAL DISEASES
FUNGI
HONGOS
http://www.fao.org/aos/agrovoc#c_11042
http://www.fao.org/aos/agrovoc#c_13251
http://www.fao.org/aos/agrovoc#c_25446
http://www.fao.org/aos/agrovoc#c_27462
http://www.fao.org/aos/agrovoc#c_3145
http://www.fao.org/aos/agrovoc#c_32
http://www.fao.org/aos/agrovoc#c_3725
http://www.fao.org/aos/agrovoc#c_4328
http://www.fao.org/aos/agrovoc#c_6710
http://www.fao.org/aos/agrovoc#c_909
HYDROGEN PEROXIDE
LIGNIFICACION
LIGNIFICATION
MALADIE FONGIQUE
PEROXIDASAS
PEROXIDASES
PEROXIDO DE HIDROGENO
PEROXYDASE
PEROXYDE D'HYDROGENE
PLANT RESPONSE
RAVENELIA ESCULENTA
REACCIONES BIOQUIMICAS
REACTION BIOCHIMIQUE
REPONSE DE LA PLANTE
RESPUESTA DE LA PLANTA
ROUILLE
ROYA
RUSTS
VIA BIOQUIMICA DEL METABOLISMO
VOIE BIOCHIMIQUE DU METABOLISME
title Hydrogen peroxide generation and lignification by peroxidases from Acacia eburnea infected with Ravenelia esculenta
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