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Visualizing Embolism Propagation in Gas-Injected Leaves.

Uri Hochberg1,2, Alexandre Ponomarenko3, Yong-Jiang Zhang3,4

  • 1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138 hochberg@agri.volcani.gov.il.

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A new gas injection method rapidly measures leaf xylem vulnerability curves (VCs) by visualizing embolism. This technique offers a faster alternative to traditional methods, though potential artifacts require further investigation for species-specific application.

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Area of Science:

  • Plant Physiology
  • Plant Anatomy
  • Xylem Function

Background:

  • Leaf xylem is vulnerable to cavitation, necessitating reliable methods to assess vulnerability.
  • Current methods for characterizing leaf xylem vulnerability can be time-consuming and prone to estimation errors.

Purpose of the Study:

  • To introduce and validate a novel gas injection method for generating leaf xylem vulnerability curves (VCs).
  • To compare the gas injection method with traditional bench dehydration techniques for VCs.
  • To assess the utility of optical light transmission for visualizing embolism propagation during gas injection.

Main Methods:

  • Developed a gas injection technique to induce embolism in detached leaves of grapevine and red oak.
  • Utilized optical light transmission to monitor and visualize the stepwise reduction in light transmission due to embolism.
  • Generated xylem vulnerability curves (VCs) based on the observed embolism progression under gas pressure.

Main Results:

  • The gas injection method rapidly generated VCs, showing stepwise light transmission reduction consistent with embolism.
  • VCs generated by gas injection in red oak were comparable to those from bench dehydration.
  • Grapevine VCs from gas injection indicated 50% loss of conductivity at a lower tension (∼0.4 MPa) than expected.

Conclusions:

  • Gas injection offers a rapid, tension-independent method for determining leaf xylem vulnerability curves.
  • The optical method effectively visualizes embolism and supports the air-seeding hypothesis.
  • Further validation is recommended to address potential artifacts and ensure species-specific applicability.