Study on the chromatism index variation of fruit peel from the ‘Newhall'navel orange and its glossy mutant during the fruit development

【Objective】The objective of the study were elucidate the chromatism index variation of fruit peel from ‘Newhall' navel orange(Citrus sinensis [L.] Osbeck ‘Newhall') and its glossy mutant during the fruit development. 【Methods】The value of L, a, b, c and h0were detected by CR-400 colorimeter. 【Result】The results showed as follows:(1) The L value and glossy degree of both materials were increased during the fruit development.(2) According to the variation of fruit peel chromatism index, the fruit development of both materials could be divided into green stage, color change stage and mature stage.(3) In the color change stage, the green color of mutant peel faded faster than ‘Newhall' control. Moreover, the red and yellow degree of mature mutant fruit peel was higher than the control, which suggested that the mutant fruit peel color was stronger than that of control. 【Conclusion】The mutant fruit had more excellent exterior quality than the control.