Fruit colour progression in grapefruit with relation to carotenoid and Brix-acid ratio

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Published

2023-06-28

DOI:

https://doi.org/10.58993/ijh/2023.80.2.9
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Issue

Vol. 80 No. 2 (2023): Indian Journal of Horticulture

Section

Research Articles

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Copyright (c) 2023 Indian Journal of Horticulture

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This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Authors

  • T S Chahal Punjab Agricultural UniversityPAU, Fruit Research Station, Jallowal-Lesriwal, Jalandhar-144303, Punjab, India.
  • Varinder Singh Department of Fruit Science, Punjab Agricultural University, Ludhiana- 141004, Punjab, India.
  • PPS Gill Department of Fruit Science, Punjab Agricultural University, Ludhiana- 141004, Punjab, India.
  • SK Jawandha Department of Fruit Science, Punjab Agricultural University, Ludhiana- 141004, Punjab, India.
  • Vikramjit Singh Department of Fruit Science, Punjab Agricultural University, Ludhiana- 141004, Punjab, India.

Abstract

In citrus, fruit colouration is considered one of the criteria to assess the optimum harvest maturity. The present study the fruit colour variations, β-carotene and its relation to soluble Brix/acid ratio (B/A ratio) during development in four grapefruit varieties viz. Marsh Seedless, Flame, Rio Red and Redblush were investigated. Among different grapefruit varieties, the highest peel colour coordinate a* value and β-carotene content were recorded in cv. Flame at 270 days after full bloom (DAFS). The peel β-carotene concentration varied from 3.61 to 61.42 μg.g-1 during fruit development. L*coordinate showed a declining pattern in the pulp, while it increased in peel till 270 DAFS. Likewise, b* values also increased in both peel and pulp. Chroma (C*) and B/A ratio values of fruit increased with maturity, while the hue angle (h°) decreased. L*a*b*colour coordinates showed a strong correlation with B/A ratio compared to β-carotene content. At the final fruit harvest, the higher value for L* coordinate in peel and pulp was noted in ‘Redblush’ and ‘Marsh Seedless’. In contrast, the highest b* coordinate was observed in the peel and pulp of the Marsh Seedless variety. Overall, a* coordinate was observed to be the most reliable colour parameter to determine the maturity index in the studied varieties of grapefruit.

How to Cite

Chahal, T. S., Varinder Singh, PPS Gill, SK Jawandha, & Vikramjit Singh. (2023). Fruit colour progression in grapefruit with relation to carotenoid and Brix-acid ratio. Indian Journal of Horticulture, 80(2), 184–189. https://doi.org/10.58993/ijh/2023.80.2.9

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