Abstract: The late-maturing,high-quality orange,"Murcott",was partly grafted on ponkan tree.The young Murcott fruits were removed to allow the photosynthesis products of the leaves to be diverted to the fruits on the host tree.Thereby,the quality of ponkan fruits was greatly improved.The improvements gained included(a) a delayed maturation of 30 to 45d as compared to the control;(b) the average soluble solids content of the fruits reached 15.1%,which was 34.7% higher than regular ponkan,as determined by Fujian Entry-Exit Inspection Quarantine Bureau of P.R.China and certified by the specialists for 3 consecutive years;(c) the average seed number in a fruit was markedly reduced to 6.7,a 61.9% decrease from ponkan's 17.6;(d) the rind thickness decreased 28.0%,while it retained its original easy peeling characteristic;and,(e) the flesh was tender and flavorful with a hint of Murcott taste.