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Chen Ligeng ( Research Institute of Citrus, Chinese Academy of Agricultural Science ) Mitsuo Omura and Tetsushi Hidaka ( Okitsu Branch, Fruit Tree Research Station, Japan )  
Isozymes of glutamate oxaloacetate transaminase ( GOT ) were ana-lyzed by the electraphoresi for 52 species and cultivars of 11 genera of Aurantiae. The results indicated that the pattern and genotype showed a great range of variability among genera, but Fortunella and Atalantia had the same GOT-2 pattern,indicating that Atalantia might be the pio-neer genus of Foriunella,and Aegle the pioneer genus of triforiate oran-ge. The results of the present study supported the view-point of Scora that citron, pummelo and mandarin are three elementary species of Citrus. However, the initial species of mandarin should be Tachibana or similar wild species. According to GOT-2 bands and their shapes, we propose that lime evolves from papeda, rough lemon is a hybrid between limonia and lemon, Meyer lemon and bergamot are hybrids of lime and lemon,oran-ges come from hybridization of pummelo and mandarin. Two new bands which moved faster than P band in GOT-1 of Feroniella, Seuerinia and Atalantia were named G and H respectively.
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