Swift metabolite changes and leaf shedding are milestones in the acclimation process of grapevine under prolonged water stress

Asfaw Degu, Uri Hochberg, Darren C.J. Wong, Giorgio Alberti, Naftali Lazarovitch, Enrico Peterlunger, Simone D. Castellarin, Jose C. Herrera, Aaron Fait

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Background: Grape leaves provide the biochemical substrates for berry development. Thus, understanding the regulation of grapevine leaf metabolism can aid in discerning processes fundamental to fruit development and berry quality. Here, the temporal alterations in leaf metabolism in Merlot grapevine grown under sufficient irrigation and water deficit were monitored from veraison until harvest. Results: The vines mediated water stress gradually and involving multiple strategies: osmotic adjustment, transcript-metabolite alteration and leaf shedding. Initially stomatal conductance and leaf water potential showed a steep decrease together with the induction of stress related metabolism, e.g. up-regulation of proline and GABA metabolism and stress related sugars, and the down-regulation of developmental processes. Later, progressive soil drying was associated with an incremental contribution of Ca 2+ and sucrose to the osmotic adjustment concomitant with the initiation of leaf shedding. Last, towards harvest under progressive stress conditions following leaf shedding, incremental changes in leaf water potential were measured, while the magnitude of perturbation in leaf metabolism lessened. Conclusions: The data present evidence that over time grapevine acclimation to water stress diversifies in temporal responses encompassing the alteration of central metabolism and gene expression, osmotic adjustments and reduction in leaf area. Together these processes mitigate leaf water stress and aid in maintaining the berry-ripening program.

Original languageEnglish
Article number69
JournalBMC Plant Biology
Volume19
Issue number1
DOIs
StatePublished - 11 Feb 2019

Keywords

  • Grapevine
  • Grapevine acclimation
  • Leaf shedding
  • Metabolite alteration
  • Transcript alteration
  • Water stress

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