, Volume 246, Issue 3, pp 525–535 | Cite as

Low source–sink ratio reduces reserve starch in grapevine woody canes and modulates sugar transport and metabolism at transcriptional and enzyme activity levels

  • Angélica Silva
  • Henrique Noronha
  • Zhanwu Dai
  • Serge Delrot
  • Hernâni Gerós
Original Article


Main conclusion

Severe leaf removal decreases storage starch and sucrose in grapevine cv. Cabernet Sauvignon fruiting cuttings and modulates the activity of key enzymes and the expression of sugar transporter genes.

Leaf removal is an agricultural practice that has been shown to modify vineyard efficiency and grape and wine composition. In this study, we took advantage of the ability to precisely control the number of leaves to fruits in Cabernet Sauvignon fruiting cuttings to study the effect of source–sink ratios (2 (2L), 6 (6L) and 12 (12) leaves per cluster) on starch metabolism and accumulation. Starch concentration was significantly higher in canes from 6L (42.13 ± 1.44 mg g DW−1) and 12L (43.50 ± 2.85 mg g DW−1) than in 2L (22.72 ± 3.10 mg g DW−1) plants. Moreover, carbon limitation promoted a transcriptional adjustment of genes involved in starch metabolism in grapevine woody tissues, including a decrease in the expression of the plastidic glucose-6-phosphate translocator, VvGPT1. Contrarily, the transcript levels of the gene coding the catalytic subunit VvAGPB1 of the VvAGPase complex were higher in canes from 2L plants than in 6L and 12L, which positively correlated with the biochemical activity of this enzyme. Sucrose concentration increased in canes from 2L to 6L and 12L plants, and the amount of total phenolics followed the same trend. Expression studies showed that VvSusy transcripts decreased in canes from 2L to 6L and 12L plants, which correlated with the biochemical activity of insoluble invertase, while the expression of the sugar transporters VvSUC11 and VvSUC12, together with VvSPS1, which codes an enzyme involved in sucrose synthesis, increased. Thus, sucrose seems to control starch accumulation through the adjustment of the cane sink strength.


Leaf–cluster ratio Leaf removal Starch Viticulture Vitis vinifera 



Sucrose synthase


Glucose-6-phosphate/phosphate translocator


ADP-glucose pyrophosphorylase


Granule-bound starch synthases


Starch synthases


Sucrose-phosphate synthase


Sucrose transporter


Sugars will eventually be exported transporter


Plastidic nucleotide transporter


Compliance with ethical standards


The work was supported by European Union Funds (INTERACT-NORTE-01-0145-FEDER-000017-Linha VitalityWine-ON 0013), Portuguese national funds (FCT-Portuguese Foundation for Science and Technology) under the Project UID/AGR/04033/2013 and the Conseil Interprofessionnel du Vin de Bordeaux (CIVB, France) under the Project CANOGRAPE N°44233. HN (SFRH/BPD/115518/2016) was supported by postdoctoral grant from FCT.

Conflict of interest

No conflicts of interest were declared.

Supplementary material

425_2017_2708_MOESM1_ESM.docx (333 kb)
Supplementary material 1 (DOCX 333 kb)


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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Centro de Investigação e de Tecnologias Agro-ambientais e Biológicas (CITAB)Vila RealPortugal
  2. 2.UMR EGFV, Bordeaux Science Agro, INRAUniversité de BordeauxVillenave D’OrnonFrance
  3. 3.Centre of Molecular and Environmental Biology (CBMA)University of MinhoBragaPortugal
  4. 4.Centre of Biological Engineering (CEB)University of MinhoBragaPortugal

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