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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 72, No. 3, 2012, pp. 411-418
Bioline Code: cj12063
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 72, No. 3, 2012, pp. 411-418

 en ALTERATIONS OF THE ANTIOXIDANT ENZYME ACTIVITIES ARE NOT GENERAL CHARACTERISTICS OF THE COLONIZATION PROCESS BY ARBUSCULAR MYCORRHIZAL FUNGI
Rodríguez, Yakelin; Vierheilig, Horst & Mazorra, Luis M.

Abstract

Antioxidant system is involved in arbuscular mycorrhizal symbiosis, but its role during the colonization process is still poorly understood. To gain new insights into the role of antioxidant system during root colonization by arbuscular mycorrhizal fungi, the activities of key antioxidant enzymes were evaluated in tomato ( Solanum lycopersicum check for this species in other resources L.) roots inoculated with six strains of different genera and species: two Glomus mosseae check for this species in other resources , Glomus cubense check for this species in other resources , Glomus intraradices check for this species in other resources , Glomus check for this species in other resources sp. and Acaulospora scrobiculata check for this species in other resources . Glomus cubense check for this species in other resources and A. scrobiculata strains reached the highest infectivity levels with maximum values of colonization frequency and intensity of 29-10.88% and 18-9.20%, respectively; G. mosseae strains showed an intermediate infectivity, both with 15% of colonization frequency and maximum intensities of 7.64- 7.06%, respectively; while the infectivity levels of Glomus sp. and G. intraradices strains were the lowest with colonization frequency- 13% and intensities- 5.07 and 5.41, respectively. Some activity patterns of peroxidase, superoxide dismutase, and polyphenol oxidase enzymes were not specific for early or late colonization stages neither for the colonization level and type of strain. However, a unique superoxide dismutase-band presents at early colonization and the low level of guaiacolperoxidase activity at later stages presents in all inoculated roots indicate that these antioxidant responses are independent of colonization degree and strain. Taking together, our data suggest that alterations of the antioxidant enzyme activities are not general characteristics of the colonization process by arbuscular mycorrhizal fungi, probably having the key role on those responses the specific feature of each strain rather than colonization per se.

Keywords
Peroxidases, polyphenol oxidases, superoxide dismutase, colonization intensity, Solanum lycopersicum

 
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