Assessment of proline function in higher plants under extreme temperatures

Area of Science:

• Plant Physiology
• Molecular Biology
• Agronomy

Background:

• Abiotic stresses, particularly extreme temperatures (heat and cold), significantly reduce crop yields globally.
• Plants possess inherent defense mechanisms against temperature stress, involving the accumulation of various protective metabolites.
• The amino acid proline is a key player in plant stress tolerance, accumulating under adverse conditions.

Purpose of the Study:

• To review plant responses to extreme temperatures and outline proline metabolism.
• To discuss the role of proline in stress tolerance and its interaction with other molecules.
• To explore the potential of genetic engineering for developing temperature-resilient crops.

Main Methods:

• Literature review of plant stress physiology and proline metabolism.
• Analysis of proline's role in osmotic balance, cell turgidity, and reactive oxygen species modulation.
• Discussion of proline's crosstalk with signaling molecules and osmoprotectants.

Main Results:

• Proline accumulation under temperature stress can result from increased synthesis, protein hydrolysis, or reduced degradation.
• Proline contributes to stress tolerance through various mechanisms, including osmotic adjustment and ROS modulation.
• Crosstalk between proline and other molecules like glycine betaine and abscisic acid enhances protective strategies.

Conclusions:

• Exogenous application of proline can protect plants against extreme temperatures.
• Genetic engineering of proline biosynthesis pathways holds potential for developing 'temperature-smart' crop cultivars.
• Manipulating proline metabolism is a viable strategy for future crop improvement under climate change.