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Integration of transgenes into sexual polyploidization schemes for potato (Solanum tuberosum L.)

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Abstract

Most potato transgenic research has focused on development of resistance to pathogens and modification of potato physiology. Many transgenes, particularly those conferring pathogen resistance, could substantially lower potato production costs in developing countries. However, transgenes have not been reported in sexually propagated 4x-2x potato hybrids commonly grown in developing countries. Two transgenes,the Bacillus thuringiensis cry3Aa endotoxin protein gene and the PVY°coat protein gene, were engineered intodiploid and tetraploid potato using Agrobacterium tumefaciens-mediated transformation. Cry3Aa was produced at high levels in several lines while the PVY° coat protein was not expressed. Diplandroid and tetraploid genotypes were crossed to produce transgenic 4x-2x hybrids. Genetic transformation had no discernable effect on fertility ofthe primary transformants, germination of4x-2x seed derived from the transformants and agronomic performance(tuber set, average tuber weight and total tuber yield) of the 4x-2xhybrids. The transgenic 4x-2xhybrids produced non-viable pollen and could only be crossed as female parents. Results suggest that transgenes, such ascry3Aa, could be expressed in 4x-2x hybrids to lower costs of production with no significant effect on plant phenotype.

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  1. Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EA, U.K.

    Alexander A.T. Johnson

  2. Department of Horticulture, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061-0327, U.S.A.

    Richard E. Veilleux

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Johnson, A.A., Veilleux, R.E. Integration of transgenes into sexual polyploidization schemes for potato (Solanum tuberosum L.). Euphytica 133, 125–138 (2003). https://doi.org/10.1023/A:1025644523574

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