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Inheritance of a bacterial hygromycin phosphotransferase gene in the progeny of primary transgenic pea plants

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Summary

An analysis of the progeny of primary transgenic pea plants in terms of transmission of the transferred DNA, fertility and morphology is presented. A transformation system developed for pea that allows the regeneration of fertile transgenic pea plants from calli selected for antibiotic resistance was used. Expiants from axenic shoot cultures were co-cultivated with a nononcogenic Agrobacterium tumefaciens strain carrying a gene encoding hygromycin phosphotransferase as selectable marker, and transformed callus could be selected on callus-inducing media containing 15 mg/l hygromycin. After several passages on regeneration medium, shoot organogenesis could be reproducibly induced on the hygromycin resistant calli, and the regenerated shoots could subsequently be rooted and transferred to the greenhouse, where they proceeded to flower and set seed. The transmission of the introduced gene into the progeny of the regenerated transgenic plants was studied over two generations, and stable transmission was shown to take place. The transgenic nature of the calli and regenerated plants and their progeny was confirmed by DNA and RNA analysis. The DNA and ploidy levels of the progeny plants and primary regenerants were studied by chromosome analysis, and the offspring of the primary transformants were evaluated morphologically.

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Abbreviations

2,4-D:

2,4-Dichlorophenoxyacetic acid

BA:

6-ben-zyladenine

hpt :

hygromycin phosphotransferase gene

IAA:

indole acetic acid, kin, kinetin

NAA:

α-naphtalene acetic acid

picloram:

4-amino-3,5,6-trichloropicolinic acid

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Communicated by I. Potrykus

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Puonti-Kaerlas, J., Eriksson, T. & Engström, P. Inheritance of a bacterial hygromycin phosphotransferase gene in the progeny of primary transgenic pea plants. Theoret. Appl. Genetics 84, 443–450 (1992). https://doi.org/10.1007/BF00229505

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  • DOI: https://doi.org/10.1007/BF00229505

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