关键词: 柑橘, 同工酶, 品质, 贡柑

Abstract: Gonggan is a superexcellent local variety of Citrus reticulata Blanco in Zhaoqing area of Guangdong province, China. An analysis of the relations between isoenzymes and fruit quality of Gonggan from different orchards in Deqing country of Guangdong province was carried out to determine variation of the Gonggan population. Results showed that there were differences in isoenzymes and activity of peroxidase (POD) and catalase (CAT) among different orchards, but POD isoenzymes exhibited mo re diversity. There were significant correlations between POD isoenzymes and soluble solid, flesh texture and fruit juice. The results also indicated that absence of POD isoenzyme (Rf=0.24) in the fruit from the trees, which have been infected by the citrus yellow shoot (Huanglongbing), suggested a molecular diagnostic marker. The approach of the Gonggan improvement was discussed in this paper.

Key words: citrus, isoenzymes, fruit quality, Gonggan variety