ISHS Acta Horticulturae 701: XII International Symposium on Apricot Culture and Decline
BREEDING PROGRAMME FOR MONILINIA LAXA (ADERH. ET RUHL.) RESISTANCE ON APRICOT |
| Authors: | A. Nicotra, L. Conte, L. Moser, P. Fantechi, I. Barbagiovanni, M.L. Corazza, S. Vitale, A. Magnotta |
| Keywords: | Prunus armeniaca, breeding, Monilinia laxa, resistance |
| Abstract:
A breeding programme for resistance to Monilinia laxa (Aderh. et Ruhl.) began seven years ago by carrying out artificial crosses between apricot resistant varieties and high quality cultivars. The progenies, 1200 seedlings, were tested for resistance to M. laxa by artificial inoculation of the fungus onto the branches, while 42 advanced selections were tested by inoculation onto the fruits. The ‘San Castrese’ cultivar was used as a reference because of its high susceptibility to the disease. As regards the resistance of the branch to the fungus, the 485 G III 136 (Amal o.p.) × Ivonne Liverani, Perfection × Hamidi and 486 C11 XXVI 89 (Ivonne Liverani o.p.) selections produced progenies with the highest percentage of resistant seedlings. Of all the inoculated seedlings, 40.0% were evaluated moderately resistant. ‘San Castrese’, used as parent, produced a high percentage of moderately resistant seedlings. The seedlings issued from which had ‘Ivonne Liverani’ as parent produced progenies with the highest percentages of resistant seedlings. ‘Perfection’ and ‘Stark early orange’, both artificially crossed with ‘Ivonne Liverani’ or open pollinated, gave progenies with a low percentage of resistant seedlings, but a higher percentage of moderately resistant seedlings. Resistance to M. laxa in apricot is a quantitative trait that tends to be dominant. Regarding the resistance of the fruit to the M. laxa, 11 advanced selections were evaluated as resistant. The "branch resistance" and the "fruit resistance" characters seem to be frequent within the apricot species. They are quantitative genetic characters not correlated between them. | |
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