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Tomato mottle virus (ToMoV) is a silverleaf whitefly ( Bemisia argentifolii  Bellows and Perring n. sp.) transmitted, bipartite geminivirus that infects tomatoes ( Lycopersicon esculentum  Mill.). Inbred lines resistant to ToMoV were derived from  Lycopersicon chilense  Dunal accession LA 1932. Inheritance was studied using a family developed from the crossing of a resistant inbred with a susceptible tomato inbred over two seasons. The F 1  had resistance intermediate to the parents and generation means analysis of F 1  and F 2 , backcross and parental populations suggested that the action of at least two additive genes with high heritability (h 2  n.s.  = 0.87) controlled ToMoV resistance. When data from the two seasons were combined, an acceptable fit to an additive-dominance genetic model was obtained. Single plant comparisons, bulk comparisons, and tailends of F 2  populations segregating for ToMoV resistance derived from LA 1932 identified randomly amplified polymorphic DNA (RAPD) markers using eight hundred 10-mer oligonucleotide primers. The F 2  populations used for inheritance studies were screened for polymorphic markers, and 12 RAPD markers associated with the ToMoV resistant line were linked to the morphological markers self-pruning ( sp ) and potato leaf ( c ) on chromosome 6. RAPD markers that were associated with ToMoV resistance segregated into two linked regions flanking either side of the  sp  and  c  loci. The molecular studies suggested that the action of at least two additive regions controlled ToMoV resistance which supported the inheritance analysis.

Inheritance and Linkage of Tomato Mottle Virus Resistance Genes Derived from Lycopersicon chilense Accession LA 1932