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Induction of defense responses in cucumber plants (Cucumis sativus L.) by the Biocontrol agent Trichoderma harzianum
Year:
1999
Authors :
Yedidia, Iris
;
.
Volume :
65
Co-Authors:
Yedidia, I., Dept. Plant Pathol. and Microbiol., Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel
Benhamou, N., Rech. en Sci. de la Vie et de la S., Laval University, University City, Que. G1K 7P4, Canada
Chet, I., Dept. Plant Pathol. and Microbiol., Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel
Facilitators :
From page:
1061
To page:
1070
(
Total pages:
10
)
Abstract:
The potential of the biocontrol agent Trichoderma harzianum T-203 to trigger plant defense responses was investigated by inoculating roots of cucumber seedlings with Trichoderma in an aseptic, hydroponic system. Trichoderma-treated plants were more developed than nontreated plants throughout the experiment. Electron microscopy of ultrathin sections from Trichoderma-treated roots revealed penetration of Trichoderma into the roots, restricted mainly to the epidermis and outer cortex. Strengthening of the epidermal and cortical cell walls was observed, as was the deposition of newly formed barriers. These typical host reactions were found beyond the sites of potential fungal penetration. Wall appositions contained large amounts of callose and infiltrations of cellulose. The wall-bound chitin in Trichoderma hyphae was preserved, even when the hyphae had undergone substantial disorganization. Biochemical analyses revealed that inoculation with Trichoderma initiated increased peroxidase and chitinase activities within 48 and 72 h, respectively. These results were observed for both the roots and the leaves of treated seedlings, providing evidence that T. harzianum may induce systemic resistance mechanisms in cucumber plants.
Note:
Related Files :
Agriculture
Cucumber
Cucumis sativus
disease resistance
fungus hyphae
Inoculation
plant growth
plant root
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Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
21234
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:42
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Scientific Publication
Induction of defense responses in cucumber plants (Cucumis sativus L.) by the Biocontrol agent Trichoderma harzianum
65
Yedidia, I., Dept. Plant Pathol. and Microbiol., Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel
Benhamou, N., Rech. en Sci. de la Vie et de la S., Laval University, University City, Que. G1K 7P4, Canada
Chet, I., Dept. Plant Pathol. and Microbiol., Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel
Induction of defense responses in cucumber plants (Cucumis sativus L.) by the Biocontrol agent Trichoderma harzianum
The potential of the biocontrol agent Trichoderma harzianum T-203 to trigger plant defense responses was investigated by inoculating roots of cucumber seedlings with Trichoderma in an aseptic, hydroponic system. Trichoderma-treated plants were more developed than nontreated plants throughout the experiment. Electron microscopy of ultrathin sections from Trichoderma-treated roots revealed penetration of Trichoderma into the roots, restricted mainly to the epidermis and outer cortex. Strengthening of the epidermal and cortical cell walls was observed, as was the deposition of newly formed barriers. These typical host reactions were found beyond the sites of potential fungal penetration. Wall appositions contained large amounts of callose and infiltrations of cellulose. The wall-bound chitin in Trichoderma hyphae was preserved, even when the hyphae had undergone substantial disorganization. Biochemical analyses revealed that inoculation with Trichoderma initiated increased peroxidase and chitinase activities within 48 and 72 h, respectively. These results were observed for both the roots and the leaves of treated seedlings, providing evidence that T. harzianum may induce systemic resistance mechanisms in cucumber plants.
Scientific Publication
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