Summary
Cultured microspores of diploid potato clones lead with high frequency to diploid regenerants. In this paper we report on the genetic variability for in-vitro monohaploid production from anthers of diploid plants. Three diploid genotypes have been isolated which combine the capacity to regenerate monohaploid plants with outstanding embryoid production. A trait of the anther-donor clones associated with the generation of monohaploid plants is the low production of 2n pollen grains. When present in anthers of diploid genotypes, diploid unreduced microspores are, in fact, derived mainly from a first division restitution mechanism leading to high heterozygosity of the derived embryoids, a state which apparently supports superior growth in-vitro. Also, reduced microspores have been found capable of generating diploid regenerants and the adoption of the RFLP technique allowed the isolation of such diploid plants, which can be considered to be pure lines. Donor clones with a low capacity to generate monohaploids are, as expected, poor producers of homozygous diploid plants. The selection of an anther donor producing a sufficient number of monohaploid or homozygous diploid regenerants fulfills the requirements of the first part of the analytical breeding scheme, i.e., the production of homozygous diploid clones.
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Meyer, R., Salamini, F. & Uhrig, H. Isolation and characterization of potato diploid clones generating a high frequency of monohaploid or homozygous diploid androgenetic plants. Theoret. Appl. Genetics 85, 905–912 (1993). https://doi.org/10.1007/BF00225037
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DOI: https://doi.org/10.1007/BF00225037