ISSN 2285-1364, ISSN CD-ROM 2285-5521, ISSN ONLINE 2285-1372, ISSN-L 2285-1364

Defense response induced in tomato plants (Lycopersicon Esculentum) by microbial infections

Published in Scientific Bulletin. Series F. Biotechnologies, Vol. XVI
Written by Gabriela POPA, Loredana POHRIB, Călina Petruţa CORNEA

Most of the microorganisms associated with plants are pathogens so plants generally respond to pathogen infections by using their defensive system. Plant pathogen-related (PR) proteins including peroxidase, .-1,3-glucanase, phenylalanine ammonia-lyase and chitinase are proteins that are induced as result of pathogen infections. Chitinases and .-1,3-glucanase can degrade the cell walls of some plant pathogens and that may play a role in the host plant’s defensive system. In our experiments we used Bacillus licheniformis designated as Bw, that shown antagonistic activities against various fungal pathogens including Rhizoctonia solani that cause Damping–Off of tomato. Soil application on tomato seedling roots (var. Marmade) of R. solani alone and B. licheniformis in combination with R. solani induced a significant increase in the activities of .-1,3-glucanase and phenylalanine ammonia-lyase (PAL). Peroxidase activity in both fungal and bacterial treatments was also significantly stimulated. In contrast, peroxidase activity was reduced upon inoculation of plants with a mixture of B. licheniformis- R. solani. Results indicated that PR proteins were induced in all treatments with pathogenic or non-pathogenic microorganisms.

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