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Influence of microclimate on pathogen–biocontrol agents interaction in the tomato powdery mildew (Oidium neolycopersici) pathosystem [abstract]
Year:
2011
Source of publication :
Phytoparasitica
Authors :
Agra, Ohad
;
.
Borenstein, Menachem
;
.
Elad, Yigal
;
.
Rav David, Dalia
;
.
Shulhani, Ran
;
.
Volume :
39
Co-Authors:

I. Pertot

Facilitators :
From page:
243
To page:
244
(
Total pages:
2
)
Abstract:

Oidium neolycopersici is the causal agent of tomato powdery mildew, resulting in powdery white spots on leaves and other plant parts. Severe infections lead to marked reduction in fruit size and quality and to leaf wilt. Biocontrol agents (BCAs) can provide sufficient protection, but they are sensitive to environmental conditions. A better understanding of the plant-pathogen – BCAs interaction and the effect of microclimate on the interaction can help to improve the efficacy of BCAs. Two microorganisms, a bacterium (Pseudomonas sp.) and a yeast (Rhodotorula sp.), reduced powdery mildew severity when applied separately or in combination. Observations using scanning electron microscopy revealed a different distribution of the bacteria in the absence and in the presence of powdery mildew on the leaf. The yeast was not affected by the presence of powdery mildew on the leaf. The bacterium population declined significantly at high temperature and low relative humidity (r.h.) when tested under controlled conditions.
The yeast was much less affected by these microclimate conditions. Similar results were obtained in greenhouse experiments: the bacteria survived better under high r.h. than at lower r.h. The yeast was not affected by microclimate conditions and disease level, and survived better than the bacterium during 16 days. Similar results were obtained in the grape powdery mildew system. We can therefore conclude that the yeast survives better than bacteria under severe conditions and changing microclimate conditions. [L]
The research is funded by Autonomous Province of Trento, Call for Proposal Major Projects 2006, Project ENVIROCHANGE

Note:
Related Files :
Biocontrol agents
microclimate
Oidium
Oidium neolycopersici
Solanum lycopersicum
tomato
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More details
DOI :
Article number:
0
Affiliations:
Database:
Google Scholar
Publication Type:
Abstract
;
.
Conference paper
;
.
Language:
English
Editors' remarks:
ID:
37637
Last updated date:
02/03/2022 17:27
Creation date:
23/10/2018 12:38
Scientific Publication
Influence of microclimate on pathogen–biocontrol agents interaction in the tomato powdery mildew (Oidium neolycopersici) pathosystem [abstract]
39

I. Pertot

Oidium neolycopersici is the causal agent of tomato powdery mildew, resulting in powdery white spots on leaves and other plant parts. Severe infections lead to marked reduction in fruit size and quality and to leaf wilt. Biocontrol agents (BCAs) can provide sufficient protection, but they are sensitive to environmental conditions. A better understanding of the plant-pathogen – BCAs interaction and the effect of microclimate on the interaction can help to improve the efficacy of BCAs. Two microorganisms, a bacterium (Pseudomonas sp.) and a yeast (Rhodotorula sp.), reduced powdery mildew severity when applied separately or in combination. Observations using scanning electron microscopy revealed a different distribution of the bacteria in the absence and in the presence of powdery mildew on the leaf. The yeast was not affected by the presence of powdery mildew on the leaf. The bacterium population declined significantly at high temperature and low relative humidity (r.h.) when tested under controlled conditions.
The yeast was much less affected by these microclimate conditions. Similar results were obtained in greenhouse experiments: the bacteria survived better under high r.h. than at lower r.h. The yeast was not affected by microclimate conditions and disease level, and survived better than the bacterium during 16 days. Similar results were obtained in the grape powdery mildew system. We can therefore conclude that the yeast survives better than bacteria under severe conditions and changing microclimate conditions. [L]
The research is funded by Autonomous Province of Trento, Call for Proposal Major Projects 2006, Project ENVIROCHANGE

Scientific Publication
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