GENETIC MARKERS AND LINKAGE RELATIONSHIPS FROM TETRAD DATA IN HYPOMYCES SOLANI f. CUCURBITAE

Ten loci were included in linkage studies with Hypomyces solani f. cucurbitae and the following linkage relationships were recognized: (1) compatibility locus (A/a) to a locus for tolerance to the chlorinated nitrobenzenes (cnb-2); (2) locus for femaleness (c) to the locus for maleness (m); and (3) locus for perithecial color (w) to a locus modifying femaleness (stp-4:). Usually parental ditype and tetratype asci were obtained from the cross ♂ × ♀ but the non-parental ditype ascus was found once. The two loci for sex appear to be separated by the centromere to which they both show close linkage. Centromere linkages have also been detected for the compatibility locus and the locus controlling perithecial color.

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