ISHS Acta Horticulturae 663: XI Eucarpia Symposium on Fruit Breeding and Genetics
INHERITANCE OF SCAB RESISTANCE AND PRODUCTIVITY IN APPLES |
| Authors: | B. Gelvonauskis, D. Gelvonauskienė |
| Keywords: | Malus sp., cultivars, diallel crosses, general and specific combining ability, Venturia inaequalis |
| Abstract:
Apple breeding for scab (Venturia inaequalis Cooke) resistance is the main objective of the most programs around the world. It is important to combine productivity and other economic traits with scab resistance in new cultivars. Apple cultivars ‘Orlik’, ‘Noris’, ‘Auksis’, ‘Katja’, ‘Kaunis’, ‘Tellissaare’, ‘Prima’ and ‘Idared’ were crossed according to the half diallel mating design method 4 by Griffing to give a total of 28 progenies. Significant differences were found among crosses for scab resistance and yield (P<0.01). General combining ability (GCA) was highly significant (P<0.01) for both traits and specific combining ability (SCA) for scab resistance (P<0.01). The mean square for GCA was larger than the mean square for SCA. This means that scab resistance and yield in this group of apple cultivars is controlled predominantly by additive gene action. GCA effects for scab resistance varied from –0.81 for ‘Prima’ to 0.48 for ‘Noris’ and for yield from 89.06 for ‘Prima’ to –42.69 for ‘Orlik’ when ‘Prima’ was involved in the diallel analysis. When it was omitted – ‘Katja’ had the highest values of GCA for scab resistance (-0.37) and productivity (38.79). This means that ‘Katja’ transmitted heritable factors to its progenies. The results obtained indicate that productivity was the highest in crosses involving ‘Prima’, ‘Katja’ and ‘Tellissaare’. It can be concluded that selection of parents according to their own phenotype or GCA can be successful in the group of tested cultivars. | |
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