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Molecular genetics of growth and development in Populus. II. Segregation distortion due to genetic load

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Abstract

Distortion of expected Mendelian segregation ratios, commonly observed in many plant taxa, has been detected in an experimental three-generation inbred pedigree of Populus founded by interspecific hybridization between P. trichocarpa and P. deltoides. An RFLP linkage map was constructed around a single locus showing severe skewing of segregation ratio against F2 trees carrying the P. trichocarpa allele in homozygous form. Several hypotheses for the mechanism of segregation distortion at this locus were tested, including directional chromosome loss, segregation of a pollen lethal allele, conflicts between genetic factors that isolate the parental species, and inbreeding depression as a result of genetic load. Breeding experiments to produce inbred and outcrossed progenies were combined with PCR-based detection of RFLPs to follow the fate of the deficient allele throughout embryo and seedling development. A recessive lethal allele, lth, inherited from the P. trichocarpa parent, was found to be tightly linked to the RFLP marker locus POP1054 and to cause embryo and seedling mortality. Heterozygotes (lth/+) appear to be phenotypically normal as embryos, seedlings, and young trees.

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Abbreviations

RFLP :

restriction fragment length polymorphism

PCR :

polymerase chain reaction

STS :

sequence-tagged site

SDS :

sodium dodecyl sulfate

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Authors and Affiliations

  1. Department of Biochemistry SJ-70, University of Washington, 98195, Seattle, WA, USA

    H. D. Bradshaw Jr.

  2. College of Forest Resources AR-10, University of Washington, 98195, Seattle, WA, USA

    R. F. Stettler

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  1. H. D. Bradshaw Jr.
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  2. R. F. Stettler
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Communicated by P. M. A. Tigerstedt

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Bradshaw, H.D., Stettler, R.F. Molecular genetics of growth and development in Populus. II. Segregation distortion due to genetic load. Theoret. Appl. Genetics 89, 551–558 (1994). https://doi.org/10.1007/BF00222447

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  • DOI: https://doi.org/10.1007/BF00222447

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