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Klaus Winter1

  • 1Fachbereich Biologie der Technischen Hochschule Darmstadt, Darmstadt, Deutschland.

Oecologia
|March 18, 2017
PubMed
Summary

High salinity (400 mM NaCl) induces Crassulacean acid metabolism (CAM) in Mesembryanthemum crystallinum. Plants can revert to C3 metabolism upon rehydration, showing enhanced growth.

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Area of Science:

  • Plant physiology
  • Environmental stress response
  • Biochemistry

Context:

  • Halophytic plants like Mesembryanthemum crystallinum possess unique adaptations to saline environments.
  • Understanding plant responses to abiotic stresses such as salinity is crucial for agriculture and ecology.
  • Crassulacean acid metabolism (CAM) is a carbon fixation pathway that allows plants to conserve water.

Purpose:

  • To investigate the induction of CAM-like CO2 gas-exchange reactions in Mesembryanthemum crystallinum under high salinity.
  • To determine the influence of temperature and water availability on CAM induction and reversibility.
  • To examine the metabolic and physiological changes associated with CAM induction and its reversal.

Summary:

  • Treatment with 400 mM NaCl induced CAM-like CO2 uptake at night and reduced daytime uptake in Mesembryanthemum crystallinum.
  • CAM induction was favored by high day and low night temperatures, and water absorption interruption.
  • Reversibility to C3 metabolism occurred upon transfer to non-saline conditions, accompanied by increased leaf expansion and water content.

Impact:

  • This study reveals the plasticity of Mesembryanthemum crystallinum's carbon fixation pathways in response to environmental cues.
  • Findings provide insights into the physiological mechanisms underlying plant adaptation to salinity stress.
  • Demonstrates the potential for metabolic and growth recovery in halophytes after stress alleviation.

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