（1Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Beijing 100081，China；2Agricultural
Technology Promotion Center of Chizhou City，Chizhou 247000，Anhui，China；3Research Center of Hami Melon，Xinjing
Academy of Agricultural Sciences，Wulumuqi 830091，Xinjiang，China）
Abstract：A F2 population including 153 individuals derived from a cross between 2 cultivars‘ 60’ and ‘61’，which were acidless and acid respectively，was used to analyze a linkage of SSR markers and construct a genetic map. The map contains 15 linkage groups spanning 923.2 cM with an average of 8.71 cM between markers. The multiple QTL model（MQM）method of software package MapQTL version 4.0 was used to map and analyze QTLs. 3 QTLs were detected for citric acid content，including one major QTL（expl≥10%） named cit 8.1，which explained 34.8% of the phenotypic variation. 4 QTLs were detected for TA，among which one major QTL named ta 8.1，which explained 47.5% of the phenotypic variation. 2 QTLs were detected for pH，among which one major QTL named ph 8.1，which explained 82.7% of the phenotypic variation. These 3 major QTLs related with acdic properties were co-located on LG Ⅷ .
