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Resistance genes in apple and biotypes of Dysaphis devecta
Author(s) -
ALSTON F. H.,
BRIGGS J. B.
Publication year - 1977
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1977.tb00661.x
Subject(s) - biology , orange (colour) , cultivar , aphid , inoculation , gene , horticulture , botany , resistance (ecology) , malus , genetics , agronomy
SUMMARY Apple cultivars and young seedlings were repeatedly inoculated with Dysaphis devecta from six locations in South East England. Four genes governing resistance were associated with three aphid biotypes. The gene for resistance to biotypes 1 and 2 from Cox's Orange Pippin was given the symbol Sd 1 while that from Northern Spy, for resistance to biotype 1 only, was designated Sd 2 . A single gene ( Sd 3 ) for resistance to biotype 3 was located in Malus robusta MAL 59/9 and M. zumi MAL 68/5. Worcester Pearmain, Cox, Mcintosh, Lane's Prince Albert and MAL 68/5, are heterozygous for a precursor gene Sd pr without which Sd 1 Sd 2 , and Sd 3 are ineffective.