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Related Experiment Videos

Hormonal changes induced by partial rootzone drying of irrigated grapevine.

M Stoll1, B Loveys, P Dry

  • 1Horticulture Research Unit, CSIRO Plant Industry, PO Box 350, Glen Osmond, SA 5064, Australia.

Journal of Experimental Botany
|September 28, 2000
PubMed
Summary

Partial rootzone drying (PRD) enhances wine grape water use efficiency by up to 50% without significant yield loss. This irrigation method strategically cycles water to half the root system, improving plant water regulation.

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Area of Science:

  • Horticulture
  • Plant Physiology
  • Agricultural Water Management

Background:

  • Partial rootzone drying (PRD) is an innovative irrigation strategy for wine grape production.
  • PRD aims to improve water use efficiency by maintaining a portion of the root system in a dry or drying state.
  • Understanding plant physiological responses to PRD is crucial for optimizing its application.

Purpose of the Study:

  • To investigate the physiological mechanisms underlying the effectiveness of PRD in grapevines.
  • To quantify the impact of PRD on water use efficiency, transpiration, and hormonal signaling in grapevines.
  • To compare the effects of PRD with full irrigation and complete water withholding.

Main Methods:

  • Implementing PRD by alternating irrigation between two halves of the grapevine root system on a 10-14 day cycle.

Related Experiment Videos

  • Measuring abscisic acid (ABA) concentrations in roots and leaves.
  • Monitoring stomatal conductance and xylem sap properties (ABA, pH).
  • Assessing changes in cytokinin concentrations (zeatin, zeatin-riboside) in various plant tissues.

    • Main Results:

    • PRD significantly improved water use efficiency by up to 50% with minimal crop reduction.
    • PRD induced a 10-fold increase in root ABA but only a 60% increase in leaf ABA, unlike full water withholding.
    • Stomatal conductance was reduced under PRD, correlated with increased xylem sap ABA and pH, suggesting hormonal signaling.
    • Reduced concentrations of zeatin and zeatin-riboside were observed in roots, shoot tips, and buds under PRD.

    Conclusions:

    • PRD effectively reduces stomatal conductance through chemical signals produced in drying roots, primarily ABA.
    • The technique enhances water use efficiency by modulating plant water status without severe physiological stress.
    • PRD influences hormonal balances, potentially affecting shoot growth and apical dominance, contributing to overall plant regulation.