caa a22 4500 467928886 CHVBK 20180406152937.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s10658-006-9062-z doi (NATIONALLICENCE)springer-10.1007/s10658-006-9062-z Effects of pear tree physiology on fire blight progression in perennial branches and on expression of pathogenicity genes in Erwinia amylovora [Elektronische Daten] [D. Blachinsky, D. Shtienberg, E. Zamski, D. Weinthal, S. Manulis] 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 1year-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. Springer Science + Business Media B.V., 2006 epidemiology nationallicence host-pathogen interaction nationallicence resistance nationallicence SPR : the rate of symptom progression in perennial branches nationallicence | SCR | : the absolute value of the rate of sorbitol content change nationallicence Blachinsky D. Department of Plant Pathology, Agricultural Research Organization, the Volcani Center, 50250, Bet Dagan, Israel aut Shtienberg D. Department of Plant Pathology, Agricultural Research Organization, the Volcani Center, 50250, Bet Dagan, Israel aut Zamski E. Institute of Plant Sciences and Genetics, Faculty of Agricultural Food and Environmental Sciences, Hebrew University of Jerusalem, 76100, Rehovot, Israel aut Weinthal D. Department of Plant Pathology, Agricultural Research Organization, the Volcani Center, 50250, Bet Dagan, Israel aut Manulis S. Department of Plant Pathology, Agricultural Research Organization, the Volcani Center, 50250, Bet Dagan, Israel aut European Journal of Plant Pathology Kluwer Academic Publishers 116/4(2006-12-01), 315-324 0929-1873 116:4<315 2006 116 10658 https://doi.org/10.1007/s10658-006-9062-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10658-006-9062-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Blachinsky D. Department of Plant Pathology, Agricultural Research Organization, the Volcani Center, 50250, Bet Dagan, Israel aut NATIONALLICENCE 700 1- Shtienberg D. Department of Plant Pathology, Agricultural Research Organization, the Volcani Center, 50250, Bet Dagan, Israel aut NATIONALLICENCE 700 1- Zamski E. Institute of Plant Sciences and Genetics, Faculty of Agricultural Food and Environmental Sciences, Hebrew University of Jerusalem, 76100, Rehovot, Israel aut NATIONALLICENCE 700 1- Weinthal D. Department of Plant Pathology, Agricultural Research Organization, the Volcani Center, 50250, Bet Dagan, Israel aut NATIONALLICENCE 700 1- Manulis S. Department of Plant Pathology, Agricultural Research Organization, the Volcani Center, 50250, Bet Dagan, Israel aut NATIONALLICENCE 773 0- European Journal of Plant Pathology Kluwer Academic Publishers 116/4(2006-12-01), 315-324 0929-1873 116:4<315 2006 116 10658 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer