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Root pressure-volume curve traits capture rootstock drought tolerance.

M K Bartlett1, G Sinclair1, G Fontanesi1

  • 1Department of Viticulture & Enology, University of California, Davis, CA, USA.

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|October 20, 2021
PubMed
Summary

Root pressure-volume curve traits can identify grapevine rootstock drought tolerance. These traits, reflecting root turgor and volume, help screen plants for better water management under drought stress.

Keywords:
VitisRoot hydraulicscapacitancegrapevinepressure–volumeroot drought tolerancerootstockturgor loss point

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Area of Science:

  • Plant physiology
  • Drought stress response
  • Horticultural science

Background:

  • Plant water uptake is limited by living root tissues under drought.
  • Root turgor and volume loss under water stress impacts root structure, hydraulics, and growth.
  • Functional traits are needed to screen plants for root drought tolerance.

Purpose of the Study:

  • To test if root pressure-volume (p-v) curve traits can differentiate grapevine rootstock drought tolerance.
  • To evaluate the relationship between root p-v traits and physiological responses to drought.

Main Methods:

  • Greenhouse experiment with eight grapevine rootstocks grafted to 'Chardonnay'.
  • Assessed root p-v curve traits, gas exchange, hydraulic conductance, and biomass under drought.
  • Rootstocks varied in field-trial drought performance.

Main Results:

  • Root p-v traits varied significantly among rootstocks.
  • Drought reduced root turgor loss point (πtlp), osmotic potential at full hydration (πo), and capacitance (C).
  • Drought-tolerant rootstocks showed distinct p-v traits under well-watered and water-stressed conditions.

Conclusions:

  • Acclimation of root p-v traits may enhance gas exchange under drought.
  • Root hydraulics and root-to-shoot signaling are potential mechanisms.
  • Maintaining root turgor and volume is crucial for field drought performance in heterogeneous soils.