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Effects of pear tree physiology on fire blight progression in perennial branches and on expression of pathogenicity genes of Erwinia amylovora - from Acta Horticulturae
Year:
2008
Source of publication :
Acta Horticulturae
Authors :
Blachinsky, Daphna
;
.
Manulis-Sasson, Shulamit
;
.
Shtienberg, Dan
;
.
Weinthal, Dan
;
.
Volume :
793
Co-Authors:

Zamski, E., Institute of Plant Sciences and Genetics, Faculty of Agricultural Food and Environmental Sciences, Hebrew University of Jerusalem, Rehovot 76100, Israel
Blachinsky, D., Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel
Shtienberg, D., Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel
Weinthal, D., Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel
Manulis, S., Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel

Facilitators :
From page:
305
To page:
312
(
Total pages:
8
)
Abstract:
The extent of symptom progression and the final length of fire blight cankers in perennial branches were variably affected by the vigor of the trees and the season of infection. Monographs taken by transmission electron microscope (TEM) showed that Erwinia amylovora cells secreted unidentified material to the intercellular spaces; the form and quantity of this material varied according to the season of infection and the vigor of the trees. The interaction between E. amylovora and the physiological status of pear trees was examined under orchard conditions. Qualitatively, tree response to fire blight was governed by their vigor and their phenological stage at the time of infection. Quantitatively, the rate of symptom progression in perennial branches (SPR) was significantly (P≤0.001) related to the absolute value of the rate of sorbitol content change (|SCR|). |SCR| in annual shoots fluctuated markedly over time, in line with the phenological stage of the trees, their vigor and the horticultural practice employed, viz., application of a growth regulator, pruning or post-harvest irrigation quantity. Pruning enhanced E. amylovora virulence (estimated according to hrpE expression) by 1.2 to tenfold as compared with non-treated trees, whereas application of a growth regulator decreased E. amylovora virulence by factors of 1.5 to 100. The conclusion is that horticultural practices that readily disrupt the physiological status of the host enhance its susceptibility to E. amylovora whereas practices that stabilize the physiological status of the host increase its resistance. The latter may be used as basis for disease management.
Note:
Related Files :
Erwinia amylovora
growth regulators
Ice nucleation
Pyrus
Sorbitol content
Symptom progression
Uniconazole
virulence
Show More
Related Content
More details
DOI :
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
Conference paper
;
.
Language:
English
Editors' remarks:
ID:
29631
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:48
You may also be interested in
Scientific Publication
Effects of pear tree physiology on fire blight progression in perennial branches and on expression of pathogenicity genes of Erwinia amylovora - from Acta Horticulturae
793

Zamski, E., Institute of Plant Sciences and Genetics, Faculty of Agricultural Food and Environmental Sciences, Hebrew University of Jerusalem, Rehovot 76100, Israel
Blachinsky, D., Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel
Shtienberg, D., Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel
Weinthal, D., Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel
Manulis, S., Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel

Effects of pear tree physiology on fire blight progression in perennial branches and on expression of pathogenicity genes of Erwinia amylovora
The extent of symptom progression and the final length of fire blight cankers in perennial branches were variably affected by the vigor of the trees and the season of infection. Monographs taken by transmission electron microscope (TEM) showed that Erwinia amylovora cells secreted unidentified material to the intercellular spaces; the form and quantity of this material varied according to the season of infection and the vigor of the trees. The interaction between E. amylovora and the physiological status of pear trees was examined under orchard conditions. Qualitatively, tree response to fire blight was governed by their vigor and their phenological stage at the time of infection. Quantitatively, the rate of symptom progression in perennial branches (SPR) was significantly (P≤0.001) related to the absolute value of the rate of sorbitol content change (|SCR|). |SCR| in annual shoots fluctuated markedly over time, in line with the phenological stage of the trees, their vigor and the horticultural practice employed, viz., application of a growth regulator, pruning or post-harvest irrigation quantity. Pruning enhanced E. amylovora virulence (estimated according to hrpE expression) by 1.2 to tenfold as compared with non-treated trees, whereas application of a growth regulator decreased E. amylovora virulence by factors of 1.5 to 100. The conclusion is that horticultural practices that readily disrupt the physiological status of the host enhance its susceptibility to E. amylovora whereas practices that stabilize the physiological status of the host increase its resistance. The latter may be used as basis for disease management.
Scientific Publication
You may also be interested in