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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (10): 136-143.doi: 10.11924/j.issn.1000-6850.casb2022-0294

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The Correlation Between Fruit Color Indexes and Fruit Internal Quality of Mollera rubra ‘Dongkui’

YAN Liju1(), JIANG Xin2, CHEN Annan3, ZHU Anna4, WANG Jun5   

  1. 1 Linhai Specialty and Technology Extension Station, Linhai, Zhejiang 317000
    2 Taizhou Agricultural Technology Extension Center, Jiaojiang, Zhejiang 318000
    3 Linhai Bibo Fruit Professional Cooperative, Linhai, Zhejiang 317000
    4 Linhai Zhichang Agricultural Product Preservation Technology Co., Ltd., Linhai, Zhejiang 317000
    5 Linhai Dinghongyuan Fruit Professional Cooperative, Linhai, Zhejiang 317000
  • Received:2022-04-14 Revised:2022-09-18 Online:2023-04-05 Published:2023-03-27

Abstract:

The objective is to investigate the differences of fruit color indexes and internal quality of Mollera rubra ‘Dongkui’ at different maturity levels, and explore the correlation between fruit color indexes and internal quality, so as to provide reference for the appearance color evaluation and high quality harvest of M. rubra fruits. M. rubra ‘Dongkui’ cultivated in open field, greenhouse and high mountain net room were used as test materials. The fruit color indexes L*, a*, b*, a*/b*, C, H, CIRG values of M. rubra ‘Dongkui’ at different maturity levels were measured and analyzed, so were the fruit weight, firmness, soluble solid content, titratable acid content, and solid-acid ratio. The results showed that with the increase of fruit maturity, the fruit color deepened from red to dark red, violet red and dark violet, the fruit color indexes L*, a*, b*, C and H decreased, while the values of a*/b* and CIRG increased, the titratable acid content decreased, and the solid-acid ratio increased. Among them, the CIRG value showed significant differences among the four different fruit colors in the four bases, which could better reflect the color difference of M. rubra fruits. The fruits were red when the CIRG value ranged from 2.36 to 3.43, were dark red when the CIRG value ranged from 3.69 to 4.14, were violet red when the CIRG value ranged from 4.80 to 5.46, and were dark violet when the CIRG value ranged from 5.58 to 7.69, and the CIRG value was significantly and positively correlated with the solid-acid ratio of fruits in the four bases. It is suggested that CIRG value can be used as a quantitative evaluation index for fruit appearance color, maturity and internal quality of M. rubra fruits.

Key words: Mollera rubra ‘Dongkui’, maturity, fruit color index, soluble solids, solid-acid ratio