关键词: 宽皮柑橘, “蓝皮”果, 矿质元素, 果实品质

Abstract: In recent years，abnormal fruits of Citrus reticulata Blanco with commonly known as“Blue albedo”were reported to appear in some citrus producing areas. The phenomenon of blue patches or blue areas near the segment membrane side of the albedo arouses the common concern of consumers and growers. In an attempt to clarify the reason behind，the normal fruits of three loose-skinned mandarins，including Orah mandarin，Gonggan mandarin and Mashuiju tangerine，and their respective“Blue albedo” fruits were collected from three production areas in Guangxi. Anthocyanins and other flavonoids，mineral elements in the albedo were detected and analyzed. Simultaneously，soluble sugar and organic acids in the albedo and juice sacs were analyzed by using GC–MS，so as to illustrate the changes of flavor quality. The results showed that the blue color was not caused by the accumulation of anthocyanins and flavanones；the contents of 5 polymethoxyflavones in the albedo of“Blue albedo”fruit increased significantly at ripening；compared with the control，the contents of Ca，Mg，S，Zn，B and Ba in the blue albedo had significant differences，but without consistent trend. OPLS-DA analysis based on 21 mineral elements could distinguish the“Blue albedo”from the normal albedo，with K as the first marker element and S as the second. Compared with normal fruits，the content of malic acid and sucrose in blue albedo and its juice sacs increased significantly. Therefore，the formation of“Blue albedo”fruit may be related to the accumulation of various mineral element complexes or chelates under stress.

Key words: loose-skin mandarin, Citrus reticulata, “Blue albedo”fruit, mineral element, fruit quality