为了利用无损检测设备DA-Meter快速无损判定梨果实品质，本试验通过测定早熟（“绿宝石”、“早酥”）、中熟（“新梨7号”、“黄冠”、“西子绿”、“雪青”）与晚熟品种（“玉露香”、“红香酥”、“鸭梨”、“雪花”）梨果实在不同成熟期果实品质指标的变化，及运用DA-meter对果实表面DA指数（IAD值）的测定，并对IAD值与各品质指标进行相关性分析。结果证明，不同梨品种随着果实成熟，果实IAD值与可溶性固形物含量（SSC）、可溶性糖、可滴定酸（TA）、维生素C（Vc）含量及果皮饱和度C值呈不同程度线性相关，与硬度、种子褐变率与果皮色调角H值在p<0.01水平上呈极显著线性相关，表明果实IAD值能够有效反映果实品质和成熟度。因此，DA-meter可用于梨果实采后无损检测分级过程。

In order to determine rapidly and non-destructively the quality of pear fruit taking advantage of an non-destructive determination equipment, DA-Meter, quality indexes of different pear cultivars (Early-maturing: “Lvbaoshi”, “Zaosu”. Mid-maturing: “Xinli No.7”, “Huangguan”, “West green”, “Xueqing”. Late-maturing: “Yuluxiang”, “Hongxiangsu”, “Yali”, “Xuehua”) fruit and index of absorbance difference (IAD) of fruit surface based on DA-Meter were determined at different maturity stage, and correlation analysis was made between IAD value and different quality indexes. The results showed that there were linear correlations between IAD value and soluble solid content (SSC), soluble sugar, titratable acid (TA) and vitamin c (Vc) contents, as well as peel saturation C value, respectively, during fruit maturation in different cultivars of pears. Furthermore, IAD value had extremely significant linear correlations with firmness, seed browning rate and peel H value of color ratio at p<0.01 level. It indicated that IAD value could effectively response to the fruit quality and maturity. Thus, the DA-Meter could be used in the postharvest classification process under non-destructive determination in pear fruits.

国家现代农业（梨）产业技术体系（CARS-28-05B）；河北省现代农业创新工程项目（F18R）