Abstract
ABSTRACTIAD (the difference in absorbance at 670 and 720 nm), measured using a DA metre, may have utility as a harvest index for fleshy fruit. In this study, the relationship between the IAD index and chlorophyll content, background colour (L*, a*, b*), firmness, extractable juice, soluble solid content (SSC), titratable acid (TA), and SSC/TA ratio were modelled using linear regression in six peach cultivars (BaiFeng, ZaoLuZhen, YuLu, ChiTao, ZhaoYang, BaiLi). Results showed that higher IAD values were accompanied by higher chlorophyll content, firmness, TA, and b* values, and lower a* values. A significant positive relationship was observed between IAD and chlorophyll (r2 > 0.8) and firmness (r2 > 0.6) in all cultivars. The linear regression models established by the correlation of firmness and IAD could be used to predict the maturity of ‘YuLu’ peaches in each year of harvest; no significant difference was observed between the estimated and observed values after regression prediction. Because of good repeatability and high prediction accuracy, we suggest that IAD index can serve as a non-destructive indicator to assay and predict peach maturity.
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