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The Journal of Heredity 1982:73(3):245-246
© 1982 The American Genetic Association 73:245-246

other

Heterokaryons among strains of Neurospora crassa with different linear growth rates

E. J. Mullaney, and K. E. Papa

Department of Plant Pathology, Montana State University Bozeman, MT 59717
Department of Plant Pathology, University of Georgia Athens. GA 30602

Please address reprint requests to Dr. Papa

Abstract

Linear growth rates were determined for heterokaryons formed among lines of Neurospora crassa peviously selected for lineer growth rate. In order to facilitate forcing and detecting the heterokaryotic state, the linked genetic markers ylo-1, ad-1 and al-2, arg-6 were incorporated into the seiected lines through a series of backcrosses. The growth rates of the haterokaryons did not exceed the growth rates of the selected lines. Nuclear ratios in all established heterokaryons shifted from the 1:1 of the inoculum to one predominantly in favor of al-2, arg-6 nuclei. Heterokaryon growth rate was mainly influenced by the al-2, arg-6 genotype. Increasing the percentage of this genotype in the inoculisn, however, hod no significant effect on linear growth rate.


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