ISHS Acta Horticulturae 704: X International Workshop on Fireblight
FIRST RESULTS OF FIRE BLIGHT RESISTANCE SCREENING IN A HUNGARIAN APPLE BREEDING PROGRAMME |
| Authors: | M. Toth, M. Kasa, M. Göndör, K Honty, M. Hevesi |
| Keywords: | Erwinia amylovora, Malus x domestica, progenies of Prima, apple breeding |
| Abstract:
During the apple breeding program for multiple resistance, started in the early 1990’s 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 (5x108 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. | |
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