אסיף מאגר המחקר החקלאי

Effects of pear tree physiology on fire blight progression in perennial branches and on expression of pathogenicity genes in Erwinia amylovora - from European Journal of Plant Pathology

Year:

2006

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Volume :

116

Co-Authors:

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

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Abstract:

The interaction between Erwinia amylovora (the causal agent of fire blight) and the physiological status of pear trees was examined under orchard conditions. The physiological status of the trees was defined qualitatively, using host phenology and vigour as measures, and quantitatively, using the sorbitol content in annual shoots as a measure. Qualitatively, tree response to fire blight was governed by phenological stage at the time of infection and vigour: low vigour trees inoculated in the autumn (just before entering dormancy) and high vigour trees inoculated in the spring (soon after bloom) were more susceptible than high vigour trees inoculated in the autumn and low vigour trees inoculated in the spring. Quantitatively, the rate of symptom progression in perennial branches (SPR) was significantly (P ≤ 0.001) correlated to the absolute value of the rate of sorbitol content change (|SCR|). The relationship between hrp genes expression of transformed E. amylovora (estimated according to hrpE and hrpJ expression) and |SCR| was determined on 1 year-old trees. Expression of hrp genes was significantly correlated with |SCR| (P = 0.004) and 63.5% of the variability in the hrp genes expression was attributed to |SCR| values. The expression of hrp genes increased gradually and asymptotically with increasing |SCR| values; further increase in |SCR| did not affect the expression. © 2006 Springer Science + Business Media B.V.

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