Abstract:

Based on the data of 131 fruit quality indicators of yellow passion fruit and meteorological data of ten periods before fruit harvesting from 2019 to 2022, the regression relationship model was established by correlation and multivariate stepwise regression analysis, to screen out the key meteorological factors with biological significance of yellow passion fruit. Combination with the comprehensive contribution of individual quality indicators of yellow passion fruit to total fruit quality, the weighted index summation method was used to construct the climate quality index model of yellow passion fruit, which provided a reference for the comprehensive evaluation of the quality grade of yellow passion fruit. The results showed that: (1) the key meteorological factors affecting the quality of yellow passion fruit were the average daily sunshine hours and daily precipitation of 10 days, average maximum temperature of 20 and 30 days, and average daily precipitation of 60 days before havvesting, a total of five indicators. (2) According to the passion fruit quality standards, combined with the measured quality changes and relevant expert evaluation experience, the grade and threshold of the three quality indicators of edible rate, soluble solids and total acid were determined. The edible rate of "extra high" grade was≥50%, the soluble solids were≥17.5%, and the total acid was≤3.0%. The edible rate of "high" grade was between 45%−50%, the soluble solids were between 17.0%−17.5%, and the total acid was between 3.0%−3.5%. The edible rate of "medium" grade was between 40%−45%, the soluble solids were between 16.5%−17.0%, and the total acid was between 3.5%−4.0%.The edible rate of " low" grade was ＜40%, the soluble solids were ＜16.5%, and the total acid was ＞4.0%. (3) The climate quality index (I_Qc) of yellow passion fruit was divided into four grades. The I_Qc气 corresponding to the "extra excellent", "excellent", "good" and "general" grades were≥2.5, 1.5−2.5, 0.5−1.5 and ＜0.5, respectively. A total of 54 independent samples were used to test the climate quality grade evaluation model of yellow passion fruit, and the agreement rate reached 87%. The results had a good effect on the evaluation of the climate quality grade of yellow passion fruit.

Key words: Yellow passion fruit, Quality indicators, Key meteorological factors, Climate quality index, Evaluation model