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      Distribution patterns of number of nuclei in conidia from heterokaryons of Heterobasidion annosum (Fr.) Bref. and their interpretation in terms of genomic conflict.

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          Abstract

          Ratios of nuclear genotypes observed in conidia from heterokaryotic strains of Heterobasidion annosum (Fr.) Bref., obtained from pairings between sympatrically derived, sib-related and non-sib-related homokaryons, commonly deviated from 1:1. Ratios were temporally stable, and the genotypes examined could be ranked in a strict dominance hierarchy, linked both to the relatedness of the association partners and to the growth rates of the parental homokaryons. Parental homokaryons and sibrelated heterokaryons produced conidia with a mean number of nuclei of about two, whereas non-sib-related-d heterokaryons produced conidia that were predominantly uninucleate. Moreover, whereas conidia containing more than one nucleus germinated most rapidly when derived from homokaryons or sib-related heterokaryons, uninucleate conidia germinated more readily if derived from non-sib-related heterokaryons. In a study of naturally occurring heterokaryons, distribution patterns of the number of nuclei in conidia were found to be similar to those of the homokaryons. The possible interpretation of these findings in terms of inter-nuclear genomic conflict is discussed.

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          Author and article information

          Journal
          New Phytol
          The New phytologist
          Wiley
          1469-8137
          0028-646X
          Sep 1994
          : 128
          : 1
          Affiliations
          [1 ] School of Biological Sciences, University of Bath, Claverton Down, Bath BA2 7 AY, UK.
          Article
          10.1111/j.1469-8137.1994.tb03995.x
          33874538
          ecf735b7-bc70-45ca-99f0-b21c6c4fad12
          History

          heterokaryon,Heterarobasidion annosum,conidial germination,genomic conflict,sympatric speciation

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