Article (Scientific journals)
Systemic Induction Of Phytoalexins In Cucumber In Response To Treatments With Fluorescent Pseudomonads
Ongena, MARC; Daayf, Fouad; Jacques, Philippe et al.
2000In Plant Pathology, 49 (4), p. 523-530
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Keywords :
fluorescent pseudomonads; induced systemic resistance; plant growth-promoting; rhizobacteria; phytoalexins
Abstract :
[en] The Pseudomonas putida isolate BTP1 and its sid2 mutant M3 were recently reported to protect cucumber against Pythium aphanidermatum root rot. This protection was mainly associated with an accumulation of antifungal phenolics in the treated roots. In this study, analyses of root extracts from split-root experiments showed that these phytoalexins were produced systemically. Indeed, several antifungal molecules accumulated similarly in both treated and nontreated root parts of plants protected against P. aphanidermatum with BTP1 or M3. In addition, analyses of leaf samples also revealed increased amounts of fungitoxic molecules in PGPR-treated plants, although the nature of these molecules appeared to be different from those detected in roots. The antifungal compounds isolated both from roots and leaves were mainly detected in acid-hydrolyzed extracts containing aglycones. These results suggest that PGPR can elicit phytoalexins systemically in cucumber and that the overall defence response is not based on a single phytoalexin but is chemically complex and organ-specific.
Disciplines :
Microbiology
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Ongena, MARC ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Daayf, Fouad
Jacques, Philippe 
Thonart, Philippe ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech - Biochimie et microbiologie industrielles
Benhamou, N.
Paulitz, Tc.
Belanger, Rr.
Language :
English
Title :
Systemic Induction Of Phytoalexins In Cucumber In Response To Treatments With Fluorescent Pseudomonads
Publication date :
2000
Journal title :
Plant Pathology
ISSN :
0032-0862
eISSN :
1365-3059
Publisher :
Blackwell, Oxford, United Kingdom
Volume :
49
Issue :
4
Pages :
523-530
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 December 2009

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