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Dynamics of the sucrose metabolism and related gene expression in tomato fruits under water deficit

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Abstract

The impact of water deficit on sucrose metabolism in sink organs like the fruit remains poorly known despite the need to improve fruit crops resilience to drought in the face of climate change. The present study investigated the effects of water deficit on sucrose metabolism and related gene expression in tomato fruits, aiming to identify candidate genes for improving fruit quality upon low water availability. Tomato plants were subjected to irrigated control and water deficit (−60% water supply compared to control) treatments, which were applied from the first fruit set to first fruit maturity stages. The results have shown that water deficit significantly reduced fruit dry biomass and number, among other plant physiological and growth variables, but substantially increased the total soluble solids content. The determination of soluble sugars on the basis of fruit dry weight revealed an active accumulation of sucrose and concomitant reduction in glucose and fructose levels in response to water deficit. The complete repertoire of genes encoding sucrose synthase (SUSY1-7), sucrose-phosphate synthase (SPS1-4), and cytosolic (CIN1-8), vacuolar (VIN1-2) and cell wall invertases (WIN1-4) was identified and characterized, of which SlSUSY4, SlSPS1, SlCIN3, SlVIN2, and SlCWIN2 were shown to be positively regulated by water deficit. Collectively, these results show that water deficit regulates positively the expression of certain genes from different gene families related to sucrose metabolism in fruits, favoring the active accumulation of sucrose in this organ under water-limiting conditions.

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Acknowledgements

We thank Dr. Marcos Silveira Buckeridge (IB-USP) for providing the HPAEC-PAD instrumental facilities.

Funding

This work was supported by research grant from CNPq (Process # 304878/2018–9). ACOB was recipient of a master's degree scholarship provided by CAPES Foundation (Brasília, DF, Brazil). MGMS was recipient of a Scientific initiation program (IC) scholarship provided by UESC. MGCC is a CNPq Research Fellow. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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ACOB, DSRJ and MGCC conceived and designed the experiments; ACOB, DSRJ, GCBS, MGMS, PHGAO, and AAC performed the experiments; ACOB, DSRJ, MGMS, LRC and AAC analyzed the experimental data; ACOB wrote the article; and LRC and MGCC revised the article. All the authors read and approved the final manuscript.

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Correspondence to Marcio G. C. Costa.

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Barbosa, A.C.O., Rocha, D.S., Silva, G.C.B. et al. Dynamics of the sucrose metabolism and related gene expression in tomato fruits under water deficit. Physiol Mol Biol Plants 29, 159–172 (2023). https://doi.org/10.1007/s12298-023-01288-7

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  • DOI: https://doi.org/10.1007/s12298-023-01288-7

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