Peroxidase and laccase activities in mycorrhizal and non-mycorrhizal fine roots of Norway spruce (<i>Picea abies</i>) and larch (<i>Larix decidua</i>)

Münzenberger, B.; Otter, Tilman; Polle, Andrea; Wüstrich, D.

doi:10.1139/b97-103

Cited by 42 publications

(30 citation statements)

References 25 publications

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“…This decrease of peroxidase can be associated with the increase of the number of ECM morphotypes as well as root biomass. These and several other results (Albrecht et al 1994) suggest that the mycorrhizal fungus generally induces peroxidase expression during the initial stage of symbiotic interaction (Günther et al 1998;Salzer et al 1999) and that this response is later either controlled by the plant or circumvented in mature mycorrhiza (Münzenberger et al 1997). Nevertheless, some contradictory results have also been reported.…”

Section: Mycorrhizationmentioning

confidence: 86%

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Peroxidases have more functions than a Swiss army knife

et al. 2005

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Plant peroxidases (class III peroxidases) are present in all land plants. They are members of a large multigenic family. Probably due to this high number of isoforms, and to a very heterogeneous regulation of their expression, plant peroxidases are involved in a broad range of physiological processes all along the plant life cycle. Due to two possible catalytic cycles, peroxidative and hydroxylic, peroxidases can generate reactive oxygen species (ROS) ( • OH, HOO• ), polymerise cell wall compounds, and regulate H 2 O 2 levels. By modulating their activity and expression following internal and external stimuli, peroxidases are prevalent at every stage of plant growth, including the demands that the plant meets in stressful conditions. These multifunctional enzymes can build a rigid wall or produce ROS to make it more flexible; they can prevent biological and chemical attacks by raising physical barriers or by counterattacking with a large production of ROS; they can be involved in a more peaceful symbiosis. They are finally present from the first hours of a plant's life until its last moments. Although some functions look paradoxical, the whole process is probably regulated by a fine-tuning that has yet to be elucidated. This review will discuss the factors that can influence this delicate balance.Keywords Evolution . ROS . (abiotic and biotic) stress . Cell wall loosening and cross-linking . Senescence . Fruit ripening . Symbiosis Multigenic family, evolution and homologyHeme peroxidases specific to plants belong to a superfamily that contains three different classes of peroxidases Communicated by P. Kumar

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Section: Mycorrhizationmentioning

confidence: 86%

“…Besides acting on the total peroxidase activity, mycorrhyza interaction can also regulate specific isoforms. Changes in root peroxidase profile following mycorrhiza colonisation were observed indicating a specific differential isozyme expression in roots (Münzenberger et al 1997;Timonen and Sen 1998).…”

Section: Mycorrhizationmentioning

confidence: 99%

Peroxidases have more functions than a Swiss army knife

et al. 2005

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“…Therefore, the production and/or activity of antioxidants, including enzymes (e.g. superoxide 4 dismutase, catalase and peroxidase; Münzenberger et al, 1997;Baptista et al, 2007) or phenolic compounds, might increase in plant roots and/or mycelia (Münzenberger et al, 1995;Reis et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Antioxidants in Pinus pinaster roots and mycorrhizal fungi during the early steps of symbiosis

Carocho

Ferreira

Barros

et al. 2012

Industrial Crops and Products

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Ectomycorrhizal symbiosis between fungi mycelia and the roots of some plants could have important effects in the levels of antioxidants of both partners. In the present work, the effects of co-culture period in the antioxidant properties and antioxidants (phenolics, tocopherols and sugars) production during early steps of in vitro mycorrhization (Pinus pinaster-Pisolithus arhizus and Pinus pinaster-Paxillus involutus) were evaluated. The studied parameters were determined in each culture element (root, mycelium and medium) in order to understand the response of each partner to the symbiotic association. P. arhizus proved to be more compatible with P. pinaster than P.involutus, since the antioxidant activity in the latter species increased from 48 to 72 h, while P. arhizus antioxidant properties decreased at the same period (indicative of less oxidative stress). Despite P. involutus proved to be less suitable to be included in forestation programs using mycorrhization processes, it revealed a higher potential for bioactive compounds production in the early steps of symbiosis. A maximal value of phenolics content was obtained after the first 6 h.

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“…'inoculation du Pin d' Alep par F. oxysporum se traduit par une diminution des attaques chez les plants mycorhizes. Ces resultats montrent que Ia mycorhization declenche chez I 'hote un processus de defense qui previent les attaques des organismes infectieux (Buscot eta/., 1992 ;Munzenberger et a/., 1997 ;Asiegbu et a/., 1999). Ainsi, !…”

Section: B Interaction In Vivounclassified