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The development of improved orange and grapefruit varieties via conventional breeding is not possible due their high degree of apomixis. The currently available varieties originated through natural or induced mutation. The development of a alternative breeding method is urgently needed for these citrus group. Microprotoplast Mediated Chromosome Transfer (MMCT) provides a direct way to transfer a very limited portion of the genome (one or more chromosome) from a donor species to a recipient species. In mammalian cells this procedure has been a powerful tool for gene mapping and to study the regulation of gene expression. Until recently, no chemical treatment was known for an efficient induction of microprotoplat in plants. Recently, amiprophosmethyl (APM) and cremart was found to be very efficient for the mass production of microprotoplasts in the Solanaceae family enabling a single chromosome to be transferred from potato to tomato and tobacco. To establish this technology in citrus, the efficiency of APM for the mass induction of microprotoplast from  Swiglea glutinosa , a wild relative of citrus, was studied. APM ranging from 16 to 32 μmol was effective on promoting the scattering of the chromosomes and to create multinucleated cells. The microprotoplasts will be used in chromosome transfer experiments.

079 Production of Microprotoplast from Swiglea glutinosa for Chromosome Transfer in Citrus