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Tetrads with non-reciprocal segregation in Sphaerocarpos

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Summary

From crosses of the mutant strains 402, 404 or 444xwild-type of Sphaerocarpos donnellii about 104000 tetrads with 4 sporelings, and about 20 000 tetrads with 3 sporelings were analyzed. No tetrad was found in which non-reciprocal segregation was induced by conversion. Therefore the frequency of conversion appears to be at least 10 times less in Sphaerocarpos than in ascomycetes. This conclusion is not contradicted by many tetrads (up to 30%), which segregated non-reciprocally from crosses of the mutant strain 429xwild-type, because these non-reciprocal segregations are completely in favor of the wild-type. In addition, plants of the phenotype “wild” originated in crosses of the mutant strain 429 with itself about twice as often as when crossed with the wild-type. Therefore, these findings cannot be accepted as a result of conversion in the sense of hybrid-DNA-models of crossing over. We assume that plants of the “wild” phenotype are brought about by the behaviour of two genetic factors.

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Authors and Affiliations

  1. Max-Planck-Institut für Pflanzengenetik, Rosenhof, Ladenburg a.N.

    W. O. Abel

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  1. W. O. Abel
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Communicated by G. Melchers

Herrn Prof. Dr. J. Straub zum 60. Geburtstag gewidmet.

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Abel, W.O. Tetrads with non-reciprocal segregation in Sphaerocarpos . Molec. Gen. Genet. 110, 61–66 (1971). https://doi.org/10.1007/BF00276047

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