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Polyamines and abiotic stress in plants: a complex relationship.

Rakesh Minocha1, Rajtilak Majumdar2, Subhash C Minocha3

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Polyamines in plants may protect against or harm them during abiotic stress. Elevated polyamines can serve as early biochemical markers for environmental stress in trees, enabling timely management interventions.

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argininebiochemical markersgamma-aminobutyric acidglutamateornithineprolinereactive oxygen speciesstress priming

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Area of Science:

  • Plant physiology
  • Biochemistry
  • Environmental science

Background:

  • The interaction between abiotic stress and polyamines in plants has been studied for over 40 years.
  • A long-standing debate exists on whether polyamines protect plants from stress or cause damage through oxidative byproducts.
  • Polyamines are often elevated in plants experiencing both short-term and long-term abiotic stress.

Purpose of the Study:

  • To critically evaluate the literature on the relationship between abiotic stress and polyamines in plants.
  • To examine experimental strategies used to understand the functional significance of this interaction.
  • To explore the potential for improving plant productivity under abiotic stress conditions.

Main Methods:

  • Comprehensive review of published literature.
  • Analysis of experimental strategies investigating polyamine-plant stress interactions.
  • Evaluation of polyamine roles as protective agents versus damaging agents.

Main Results:

  • Increased polyamine levels correlate with enhanced plant tolerance to abiotic stress, suggesting a protective role.
  • Polyamines can also cause cellular harm due to the production of hydrogen peroxide and acrolein during catabolism.
  • A strong positive relationship between abiotic stress and foliar polyamines is proposed as a biochemical marker for early stress detection in forest trees.

Conclusions:

  • Polyamines exhibit a dual role in plant responses to abiotic stress, acting as both protectors and potential perpetrators of damage.
  • Elevated polyamines can serve as valuable early biochemical markers for persistent environmental stress in forest ecosystems.
  • Understanding this relationship is crucial for developing strategies to improve plant productivity and resilience in stressful environments.