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Asymmetric distribution of mineral nutrients aggravates uneven fruit pigmentation driven by sunlight exposure in litchi

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Abstract

Main conclusion

Sunlight boosts anthocyanin synthesis/accumulation in sunny pericarp of litchi fruit, directly leading to uneven pigmentation. Distribution discrepancy of mineral element aggravates uneven coloration by modulating synthesis/accumulation of anthocyanin and sugar.

Abstract

Uneven coloration, characterized by red pericarp on sunny side and green pericarp on shady side, impacts fruit quality of ‘Feizixiao’ (cv.) litchi. The mechanisms of this phenomenon were explored by investigating the distribution of chlorophyll, flavonoids, sugars, and mineral elements in both types of pericarp. Transcriptome analysis in pericarp was conducted as well. Sunny pericarp contained higher anthocyanins in an order of magnitude and higher fructose, glucose, co-pigments (flavanols, flavonols, ferulic acid), and mineral elements like Ca, Mg and Mn, along with lower N, P, K, S, Cu, Zn and B (P < 0.01), compared to shady pericarp. Sunlight regulated the expression of genes involved in synthesis/accumulation of flavonoids and sugars and genes functioning in nutrient uptake and transport, leading to asymmetric distribution of these substances. Anthocyanins conferred red color on sunny pericarp, sugars, Ca and Mg promoted synthesis/accumulation of anthocyanins, and co-pigments enhanced color display of anthocyanins. The insufficiencies of anthocyanins, sugars and co-pigments, and inhibition effect of excess K, S, N and P on synthesis/accumulation of anthocyanins and sugars, jointly contributed to green color of shady pericarp. These findings highlight the role of asymmetric distribution of substances, mineral elements in particular, on uneven pigmentation in litchi, and provide insights into coloration improvement via precise fertilization.

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Data availability

The data supporting the findings of this study are available from the corresponding author (Lixian Yao) upon request.

Abbreviations

CHS:

Chalcone synthase

UFGT:

UDP-glucose:flavonoid-3-O-glucosyltransferase

DFR:

Dihydroflavonol-4-reductase

CAXs:

Ca2+/H+ antiporters

LDOX/ANS:

Leucoanthocyanidin dioxygenase

GST:

Glutathione S-transferase

CHS:

Chalcone synthase

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Acknowledgements

We thank Ms. Pan Luyi at the Instrumental Analysis and Research Center of South China Agricultural University for her assistance in HPLC analysis. Mrs. Shengtong Luo at University College London is appreciated for her help in language polishing.

Funding

This research was supported by China Agriculture Research System of MOF and MARA (CARS-32-06).

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Authors

Contributions

LY and CB: conceptualization and design; XS, XZ, CB, HL, XC and LY: experimental work; XS, XZ, CB, XC and HL: sample analysis and data analysis; XS: writing of original draft; LY: funding acquisition, review and editing. All authors have read and agreed to the published version of the manuscript.

Corresponding authors

Correspondence to Cuihua Bai or Lixian Yao.

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No conflict of interest declared.

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Communicated by De-Yu Xie.

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Su, X., Zhang, X., Bai, C. et al. Asymmetric distribution of mineral nutrients aggravates uneven fruit pigmentation driven by sunlight exposure in litchi. Planta 258, 96 (2023). https://doi.org/10.1007/s00425-023-04250-9

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  • DOI: https://doi.org/10.1007/s00425-023-04250-9

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