Terahertz Spectroscopy in Assessing Temperature-Shock Effects on Citrus

Area of Science:

• Plant Physiology
• Spectroscopy
• Environmental Science

Background:

• Environmental stress induces water deficit in plants, impacting their physiological status.
• Terahertz (THz) spectroscopy is sensitive to aqueous solutions and can detect subtle changes within organisms.
• THz sensing offers a non-invasive method for evaluating plant phenotypes, particularly under stress.

Purpose of the Study:

• To investigate physiological changes in citrus leaves using THz technology under varying stress conditions.
• To correlate THz spectral information with water content and cell ion permeability.
• To establish THz spectral characteristics as indicators of plant physiological status.

Main Methods:

• Utilized terahertz (THz) spectroscopy in conjunction with traditional weighing methods.
• Applied different temperature, duration, and stress treatments to citrus leaves.
• Analyzed THz spectral data, including the relative absorption coefficient and water content (free and bound).

Main Results:

• Higher temperatures and longer stress durations led to a significant reduction in the relative absorption coefficient.
• A positive correlation was observed between stress severity and increased cell ion permeability.
• THz spectral information accurately reflected changes in free and bound water content, validated by weighing methods.

Conclusions:

• Terahertz (THz) spectral information serves as a sensitive and effective indicator of plant physiological status under stress.
• This non-invasive technique can quantify water status and changes in cell permeability.
• THz spectroscopy provides a valuable tool for rapid plant stress assessment and management.