Abstract
The large subunits (LS) and small subunits (SS) of Fraction I protein from 57 species and cultivars of the genus Citrus, Fortunella and Poncirus were compared to analyze the phylogenetic relationships among them. C. medica only had different LS. P. trifoliata and C. reticulata had unique SS respectively. Fortunella species, C. hystrix, C. latipes, C. limon and C. grandis also had the other unique SS. We consider that C. medica and C. reticulata are the original species of the cultivated citrus of the genus Citrus, along with C. grandis presumably. Thus we show our ideas of phylogenetic relationships of Citrus and its relatives based on their soelectrofocusing pattern of Fraction I protein.
