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Production of intraspecific aneuploids in the genus Solanum 2. Triploids produced from tetraploid-diploid crosses in potato

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Summary

Tetraploids from seven diploid species were crossed to diploids of the same species. The triploids which were produced in four species [S. cardiophyllum (cph), S. chacoense (chc), S. pinnatisectum (pnt) and S. tarijense (tar)] were detected using the following differential features of ploidy level: number of chloroplasts per pair of guard cells; leaf index; pollen fertility; pollen size; and seed set based on crossability with diploid males. The tetraploid-diploid crosses that gave low seed set were found to produce higher frequencies of triploids and this was used as a screening procedure for the identification of families with high frequencies of triploids. Triploids were produced with different frequencies in the four species: cph 17.8%; chc 36.6%; pnt 75%; and tar 100%.

The relatively high frequencies with which triploids were obtained were contrary to prior evidence of a widely distributed and effective triploid block. The results of the study indicate that the effectiveness of the triploid block is dependent not only on the species but also on the genotypic effects controlling endosperm development and the production of unreduced gametes.

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Author notes

  1. P. R. Rowe

    Present address: Department of Genetics, University of Wisconsin, 53706, Madison, Wisconsin

Authors and Affiliations

  1. Department of Horticulture, University of Wisconsin, 53706, Madison, Wisconsin, USA

    R. Kessel & P. R. Rowe

  2. Agricultural Research Service, U.S. Department of Agriculture, 53706, Madison, Wisconsin, USA

    R. Kessel & P. R. Rowe

  3. Breeding and Genetics Department, International Potato Center, Lima, Peru

    R. Kessel & P. R. Rowe

Authors
  1. R. Kessel
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  2. P. R. Rowe
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Additional information

Cooperative investigations of the College of Agriculture and Life Sciences, University of Wisconsin and the Agricultural Research Service, U.S. Department of Agriculture, Madison, Wisconsin. Supported in part by grants from the Research Committee of the Graduate School, University of Wisconsin.

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Kessel, R., Rowe, P.R. Production of intraspecific aneuploids in the genus Solanum 2. Triploids produced from tetraploid-diploid crosses in potato. Euphytica 24, 379–386 (1975). https://doi.org/10.1007/BF00028204

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  • DOI: https://doi.org/10.1007/BF00028204

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