Abstract
The objective of this work was to verify if the induced resistance mechanism is responsible for the capacity of a phylloplane resident bacteria (Bacillus cereus), isolated from healthy tomato plants, to control several diseases of this crop. A strain of Pseudomonas syringae pv. tomato was used as the challenging pathogen. The absence of direct antibiosis of the antagonist against the pathogen, the significant increase in peroxidases activity in tomato plants exposed to the antagonist and then inoculated with the challenging pathogen, as well as the character of the protection, are evidences wich suggest that biocontrol efficiency presented by the antagonist in previous works might be due to induced systemic resistance (ISR).
Highlights
Systemic resistance to diseases in plants can be induced by abiotic or biotic elicitors (Heil, 2001)
Not much work was performed on the ability of prokaryotic phylloplane residents as promoters of biocontrol of plant diseases through induced systemic resistance (ISR) mechanisms
To fulfill one of the criteria suggested by Steiner & Schönbeck (1995), a claimed direct antibiosis against the challenging pathogen was the hypothesis tested by the overlay diffusion method, according to a procedure by Romeiro (2001)
Summary
Systemic resistance to diseases in plants can be induced by abiotic or biotic elicitors (Heil, 2001). Not much work was performed on the ability of prokaryotic phylloplane residents as promoters of biocontrol of plant diseases through ISR mechanisms. Steiner & Schönbeck (1995) stated that an elicitor of induced resistance is not expected to cause direct toxic effects on the pathogen. Another is that activities of some specific enzymes increases in plant tissues exposed to the alleged elicitor just after the inoculation with a challenging pathogen (Sticher et al, 1997). Lipoxygenases (Porta & Rocha-Sosa, 2002), β-1,3-glucanases (Van Loon et al, 1994), phenylalanine amonia-lyases (Sharan et al, 1998), and polyphenoloxidases (Li & Steffens, 2002) are among these indicator enzymes of this so-called "induced state"
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