| Fruit pigmenting qualities have long been ignored but now attracted more and more attention due to the deepening of market concept and the improvement of living quality. To initiate a new geography division program for citrus fruit quality, the law of pigmenting quality formation should be know beforehand. To figure out the law, widely cultivated Ponkan mandarin (Citrus reticulata Blanco cv. Ponkan) and Newhall navel orange (C. sinensis L. cv. Newhall) were chosen as materials in the study. In the period of Oct. 2000 to Feb. 2002, fine quality fruit samples were collected from Provinces of Hunan, Hubei, Jiangxi, Zhejiang and Fujian. There were totally about 60 samples of Ponkan mandarin and 35 samples of Newhall navel orange, among which 70% were grafted on Poncirus tr.foliata. Information of soil state and orchard management was come along with the samples. The growth vigorness of the tree were medium or slightly strong, and the trees were about 5 to 12 years old. The original precipices were limestone or granite, which gives birth to erythro-soil or chryso-soil. And the orchard management was similar among all sample areas, the production were all beyond 1000 kg/667m2. There were three parts in the study. Part one concentrated on the forming of the regional characters of both pigmenting and ordinary qualities (including soluble solid and titratable acid content), SAS correlation analysis program was used to make clear the law of fruit pigmenting additionally. Part two took so far the unique pink pigmented navel orange Red flesh navel orange as material, trying to identify and quantify the main pigments inside the flesh during fruit development and storage. Based on the conclusion of part two, a DNA-level research was carried out in part three in an attempt to find out the reason of pigment accumulation.1. Statistics showed that of the Ponkan mandarin, a regional characteristic was easy to be seen. Among them, Yongzhou, Jishou in Hunan and Lishui in Zhejiang were redder in rind and darker in flesh, whereas Ponkan mandarin in Qintian Zhejiang were yellowier in rind and lighter in flesh, both rind and flesh C values of Ponkan mandarin in Longyan and Changtai of Fujian were uneven. Of the Newhall navel oranges, samples could be divided into four categories according to their rind and flesh clustering groups, yellowier in rind and flesh turn to be yellow-green: Anyuan in Jianxi, Shunchang and Mingxi in Fujian and Laiyang in Hunan; redder in rind and flesh turn to be yellow-green: Fuqing, Yongan and Luoyuan in Fujian; both rind and flesh turn to be yellow: Panzhihua in Sichuan and Danjiangko in Hubei; redder in rind and flesh turn to be yellow: Huitong. Xingnin, Wugang and Chaling in Hunan. Colorlab values were different among samples. In Ponkan mandarin, rind color ranged from red to orange, and the hue angles were 1.20-1.40. flesh hue angle ranged from 1.40 to 1.50.And in Newhall navel oranges, rind hue angles ranged from 1.07 to 1.44, colors were from orange-red to orange-yellow, flesh hue angles ranged from 1.58 to 1.84 and the a values were all negative.2. Results showed that Ponkan mandarin in Nanjing and Putian in Fujian contained higher soluble solid and lower titratable acid, whereas in Qintian and Quzhou of Zhejiang fruits contained higher titratable acid and lower soluble solid. The concentrations of soluble solid and titratable acid were uneven in Ponkan mandarin produced in Changtai in Fujian. Newhall navel oranges produced in Fuqing in Fujian, Panzhihua in Sichuan, Xingfeng, Dayu in Jianxi, Huitong, Chaling in Hunan and Lishui in Zhejiang held higher soluble solid and lower titratable acid. Higher titratable acid and lower soluble solid content were found in Newhall produced in Xichang of Sichuan, Minxi of Fujian and Wugang of Hunan , while in Anyuan of Jiangxi fruits were not so stable as far as concentrations of soluble solid and titratable acid were concerned. The soluble solid and titratable acid concentration of Ponkan mandarin were 10.8%-15.4% and 0.33%-1.49%, while in Newhall...
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