LINKAGE AND ALLELIC RELATIONSHIPS AMONG GENES FOR RESISTANCE IN TOMATO (LYCOPERSICON ESCULENTUM) AGAINST MELOIDOGYNE INCOGNITA

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Abstract
Linkage and allelic relationships among genes for resistance in tomato (Mi, LMiR1, LMiR2 and LMir3) against M. incognita Kofoid et White were investigated. Two of the resistance genes, LMiR1 possessed by the cultivar ''Nematex'' and LMiR2 possessed by ''Small Fry-1'', are closely linked and are approximately 5.65 morgan units apart, while the resistance genes LMiR1 and Mi are either identical or allelic. No relationship could be established between the recessive gene for resistance LMir3 possessed by ''Cold Set-1'' with other genes which may be due to cytoplasmic and temperature factors affecting this cultivar.