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Textile Hemp vs. Salinity: Insights from a Targeted Gene Expression Analysis.

Gea Guerriero1, Marc Behr2, Jean-Francois Hausman3

  • 1Environmental Research and Innovation (ERIN) Department, Luxembourg Institute of Science and Technology (LIST), L-4362 Esch/Alzette, Luxembourg. gea.guerriero@list.lu.

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Soil salinity negatively impacts crop yield. This study reveals distinct gene expression patterns in hemp leaves and hypocotyls under salt stress, offering insights into plant adaptation mechanisms for improved crop resilience.

Keywords:
bast fiberscell wallgene expressionhempsalinity

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Area of Science:

  • Plant Biology
  • Agricultural Science
  • Molecular Biology

Background:

  • Soil salinity poses a significant threat to global agriculture, reducing crop productivity and biomass.
  • Fiber crops, such as textile hemp (Cannabis sativa L.), are vital sustainable resources for industrial applications.
  • Understanding plant responses to salinity is crucial for developing salt-tolerant crop varieties.

Purpose of the Study:

  • To investigate the tissue-specific molecular responses of fiber hemp (Santhica 27) to salt stress (200 mM NaCl).
  • To analyze changes in gene expression related to cell wall biosynthesis, stress response, and lignification in hemp plantlets.
  • To correlate gene expression data with microscopic observations of cellular changes under salinity.

Main Methods:

  • Quantitative real-time PCR was used to measure gene expression levels in hemp plantlets.
  • Microscopic analysis was performed on hypocotyl cross-sections to examine tissue morphology.
  • Gene expression of cell wall-related genes, stress-responsive elements, and phytohormone pathways were analyzed.

Main Results:

  • Hemp leaves showed upregulated genes associated with heat shock proteins, ethylene-responsive factor 1 (ERF1), and secondary cell wall biosynthesis (e.g., CesA4, FLA10, FLA8).
  • A tendency towards upregulation of lignification genes (4CL, CAD, PAL) in leaves suggested potential growth arrest.
  • Hemp hypocotyls exhibited upregulation of an expansin gene (EXPA8) and calcium-dependent lipid-binding proteins (CALB), with reduced xylem vessel lumen observed microscopically.

Conclusions:

  • Hemp exhibits distinct tissue-specific responses to salinity, with leaves activating stress and cell wall biosynthesis pathways, while hypocotyls show altered expansion and vascular development.
  • The findings elucidate the complex regulatory gene network involved in hemp's response to salt stress.
  • This research contributes to understanding salinity tolerance mechanisms in fiber crops, potentially aiding in the development of more resilient agricultural practices.