Articles
FIRST RESULTS OF FIRE BLIGHT RESISTANCE SCREENING IN A HUNGARIAN APPLE BREEDING PROGRAMME
Article number
704_87
Pages
545 – 550
Language
English
Abstract
During the apple breeding program for multiple resistance, started in the early 1990s in Hungary, 18 hybrids with high fruit quality that displayed resistance to apple scab (Venturia inaequalis), and mildew (Podosphaera leucotricha) were selected for further experiments for assessment of resistance to fire blight.
These hybrids were selected from the first progenies of the scab resistant cv. Prima. Inoculation was done on actively growing 25-30 cm long shoots of grafted trees with a syringe by injecting a suspension (5×108 cfu/ml) containing a mixture of Hungarian isolates (E.a. 2; E.a. 60; E.a. 67) of Erwinia amylovora. Idared and Jonathan M40 cultivars (susceptible) and Remo and Liberty cultivars (resistant) were used as controls.
During our experiments, we evaluated disease severity (disease rating), and speed of symptom development that follows bacterial multiplication in the host plant tissues.
Among the evaluated offspring, we found several highly resistant lines.
The hybrids MR-03 and MR-10 seemed to be the most promising ones during application of each evaluation method.
Some other hybrids did not display strong visual symptoms but numbers of E. amylovora cells were relatively high, which assumes latent and symptomless reproduction of bacteria in host tissues.
These hybrids were selected from the first progenies of the scab resistant cv. Prima. Inoculation was done on actively growing 25-30 cm long shoots of grafted trees with a syringe by injecting a suspension (5×108 cfu/ml) containing a mixture of Hungarian isolates (E.a. 2; E.a. 60; E.a. 67) of Erwinia amylovora. Idared and Jonathan M40 cultivars (susceptible) and Remo and Liberty cultivars (resistant) were used as controls.
During our experiments, we evaluated disease severity (disease rating), and speed of symptom development that follows bacterial multiplication in the host plant tissues.
Among the evaluated offspring, we found several highly resistant lines.
The hybrids MR-03 and MR-10 seemed to be the most promising ones during application of each evaluation method.
Some other hybrids did not display strong visual symptoms but numbers of E. amylovora cells were relatively high, which assumes latent and symptomless reproduction of bacteria in host tissues.
Publication
Authors
M. Toth, M. Kasa, M. Göndör, K Honty, M. Hevesi
Keywords
Erwinia amylovora, Malus x domestica, progenies of Prima, apple breeding
Online Articles (93)
EA1HCONTROL OF FIRE BLIGHT WITH A LYSOZYME FROM THE ERWINIA AMYLOVORA PHAGE EA1H