Britta Kowalski

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Potato leaf morphology changes during plant development with the phase shift from vegetative growth to flowering. Image analysis can detect differences in leaf morphology and has been used here to distinguish differences in leaf morphology between potato crops derived from seed tubers and minitubers and between crops derived from different micropropagation(More)
The aim of the project was to develop micropropagation procedures for theheavily exploited and endangered South African trees black stinkwood (Ocotea bullata) and pepperbark (Warburgia salutaris) to facilitateconservation and reforestation. Both species are difficult to establish andgrow in tissue culture because of their high phenolic content. A protocol(More)
The seaweed concentrate ‘Kelpak’ is used commercially in the greenhouse and field to improve plant quality. ‘Kelpak’ was added to the in vitro culture medium of potato cv. ‘BP1’ and also applied as a leaf/soil drench immediately after transplanting. The addition of 0.25% seaweed concentrate to the medium improved plantlet quality and led to better(More)
The aim of this work was to investigate whether the application of soluble chitosan in potato micropropagation can improve microplant quality in vitro, help acclimatisation ex vitro, and increase yield and seed quality of minitubers. Potato cv. Désirée microplants were treated in vitro with soluble chitosan added to the semisolid tissue culture medium in(More)
Using visual selection for off-types and image analysis to select against maturation mutants, a line combining improved late blight resistance and yield was isolated in an in vitro mutagenesis programme from a population of 2101 putative mutants. The adventitious regenerants from mutagenesis treatment, including spontaneous mutants (somaclonal variants),(More)
The addition of a seaweed concentrate to tissue culture medium improved the quality of potato plantlets. Season, cultivar and explant type affected the most beneficial concentration applied. Concentrations higher or lower than the optimum were less beneficial or adverse to plantlet quality. Terminal buds were more sensitive to non-optimum seaweed(More)
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