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ADDITIONAL INDEX WORDS. breeding, BSA, Citrus reticulata, JOINMAP, PCR ABSTRACT. The inheritance of resistance to a host-specifi c isolate (Shinn) of Alternaria alternata (Fr.:Fr.) Keissl. from ʻMin- neolaʼ tangelo (a cross between Citrus paradisi Macf. ʻDuncanʼ and C. reticulata Blanco ʻDancyʼ) was shown to be controlled by a single recessive allele, aaM1, within the citrus genome. A backcross between resistant ʻClementineʼ mandarin (C. reticulata) and susceptible LB#8-10 (a hybrid of ʻClementineʼ mandarin and ʻMinneolaʼ tangelo) resulted in 61 resistant (R) and 58 susceptible (S) plants (χ 2 = 0.0756, P ≥ 0.05), but the reciprocal cross deviated from the expected 1R:1S ratio (87 R and 36 S plants (χ 2 = 21.1463, P ≥ 0.05). A dominant allele, AaM1, of this resistance gene was found in a loose coupling phase linkage with two RAPD markers, P12850 (15.3 cM) and AL31250 (36.7 cM), after JOINMAP computer analysis.

Linkage of an Alternaria Disease Resistance Gene in Mandarin Hybrids with RAPD Fragments