Abstract
Mildew resistance in the ornamental apple ‘White Angel’ was found to be determined by complementary genes. The gene R w was found to be necessary for the expression of resistance controlled by the resistance gene Pl w . The close linkage between the isoenzyme gene, Lap-2, for leucine aminopeptidase and P1 w was confirmed. The efficiency of Lap-2 as a marker in screening for mildew resistance is limited, as it cannot account for susceptible plants with the r w r w P1 w p1 w genotype. It has, however, an important role to play in combining resistance genes from different sources. The genotypes of ‘White Angel’ (R w r w , Pl w pl w , Lap-2an), ‘Jester’ (R w r w , p1 w p w , Lap-2an) ‘Katja’ (R w r w ,p1 w p1 w , Lap-2an) and ‘Gloster 69’ (r w r w , p1 w p1 w , Lap-2an) were determined. It also appeared that R w might influence Lap-2 activity in young seedlings.
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Communicated by H. F. Linskens
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Batlle, I., Alston, F.H. Genes determining leucine aminopeptidase and mildew resistance from the ornamental apple, ‘White Angel’. Theoret. Appl. Genetics 93, 179–182 (1996). https://doi.org/10.1007/BF00225743
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DOI: https://doi.org/10.1007/BF00225743