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  • 1.
    Waara, Sylvia
    et al.
    Department of Physiological Botany, Uppsala University, Uppsala, Sweden.
    Wallin, Anita
    Department of Physiological Botany, Uppsala University, Uppsala, Sweden.
    Ottosson, Agneta
    Department of Physiological Botany, Uppsala University, Uppsala, Sweden.
    Eriksson, Tage
    Department of Physiological Botany, Uppsala University, Uppsala, Sweden.
    Factors promoting sustained divisions of mesophyll protoplasts isolated from dihaploid clones of potato (Solanum tuberosum L.) and a cytological analysis of regenerated plants1991In: Plant Cell Tissue and Organ Culture, ISSN 0167-6857, E-ISSN 1573-5044, Vol. 27, no 3, p. 257-265Article in journal (Refereed)
    Abstract [en]

    A culture protocol has been developed for mesophyll protoplasts isolated from various dihaploid clones of potato. A special effort was made to promote the growth of initially dividing cells to form cell colonies and calli. An increase in plating efficiency in 3 different dihaploid clones and one doubled dihaploid clone was obtained after serial dilution of cultures with a suitable amount and type of medium at different stages of cell colony development. Plating on a refined semi-solid medium after 14 days of culture further improved both the yield and the quality of calli obtained. The refined plating medium also enhanced shoot regeneration ability from 67 to 90% in one of the dihaploid clones (67:9). The refined culture protocol could also be used without causing a decrease in plating efficiency at a low population density adjusted after 3 days of culture. The ploidy level of plants regenerated from dihaploid protoplasts were determined by chromosome counting and DNA analysis by flow cytometry. Most of the plants were aneuploid or tetraploid although, some dihaploid plants were obtained after protoplast culture of 2 dihaploid clones derived from the same cultivar (cv. Stina). 

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