ISHS Acta Horticulturae 663: XI Eucarpia Symposium on Fruit Breeding and Genetics
NEW APRICOT SELECTIONS RESISTANT TO MONILINIA LAXA (ADERH. ET RUHL.) |
| Authors: | L. Conte, A. Nicotra, L. Corazza |
| Keywords: | Monilinia laxa (Aderh. et Ruhl.), P. armeniaca (L.), resistance |
| Abstract:
Brown rot disease is caused mainly by Monilinia laxa (Aderh. et Ruhl.) and it is widespread in all Italian areas where stone fruits are grown. The apricot is particularly susceptible to this disease. Eight years ago, we began a breeding programme for resistance to M. laxa by carrying out artificial crosses between apricot resistant cultivars and high quality cultivars. The progenies were tested for resistance to M. laxa by artificial inoculation of the fungus onto the branch, while 42 advanced selections were tested by inoculation onto the fruit. With the resistance of the branch to the fungus, the progeny of 485GIII136 (‘Amal’ o.p.) x ‘Ivonne Liverani’ and of 486C11XXVI89 (‘Ivonne Liverani’ o.p.) produced the highest percentage of resistant seedlings: 54.0% and 45.5% respectively. The cultivar ‘San Castrese’ produced a high percentage of moderately resistant seedlings (65.0%). ‘Ivonne Liverani’ and the seedlings originated from ‘Ivonne Liverani’ produced progenies with the highest percentages of resistance. ‘Perfection’ and ‘Stark early orange’, crossed with ‘Ivonne Liverani’ or open pollinated, gave progenies with a low percentage of resistant seedlings. For the resistance of the fruit to the M. laxa, three advanced selections, 485GII37 (‘Don Gaetano’ o.p.), 493C12III61 (‘Boreale’ o.p.) and 493C12VI6 (‘Fiammetta’ o.p.) were evaluated as resistant. The ‘Ivonne Liverani’ and ‘Palumella’ cultivars are considered useful sources for resistance of the branch to M. laxa. ‘Palummella’, ‘Antonio Errani’ and ‘Dulcinea’ could also be considered suitable parents combining moderate resistance and good fruit quality. According to our results resistance to M. laxa in apricot is a quantitative trait. | |
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