La proline, un acide aminé multifonctionnel impliqué dans l’adaptation des plantes aux contraintes environnementales

Abstract

In addition to its role in primary metabolism as a component of proteins, proline is one of the most widely distributed compatible solutes that accumulates in plants during adverse environmental constraints and plays an important role in plant stress tolerance. Proline was proposed to act as stabilizer for proteins and macromolecular complexes, scavenger of free radicals and regulator of cellular redox potential. Intracellular proline concentration depends on a tight regulation between its biosynthesis and catabolism. However the exact role of proline and the signaling pathways involved in the regulation of its metabolism are not completely known yet. Investigation of proline metabolism in model plants would allow to acquire information about the diversity of the mechanisms developed by plants to overcome environmental constraints and to establish some reliable tools for the improvement of crop tolerance.

Overexpression of Rice Rab7 Gene Improves Drought and Heat Tolerance and Increases Grain Yield in Rice (Oryza sativa L.)

“…Osmotic adjustment represents one of the most important features of abiotic stress tolerance in plants, while soluble proteins, soluble sugars, proline, and other compatible solutes serve as osmoprotectants under stress conditions [57,58]. Soluble proteins and sugars also protect plant cells from dehydration and stabilize and protect the biological molecules function [59].…”

Chrysanthemum DgWRKY2 Gene Enhances Tolerance to Salt Stress in Transgenic Chrysanthemum

“…Osmotic adjustment is one of the most basic characteristics of plant salt tolerance, while proline is the most widely distributed compatible penetrant [ 33 , 34 ]. Under salt stress, we measured the proline content of transgenic lines and the WT in order to understand the osmoregulation ability of transgenic plants ( Figure 7 A).…”

Proline Metabolism in Cell Regulation and Cancer Biology: Recent Advances and Hypotheses

“…Although this review emphasizes cancer in humans, the reader should be aware of the numerous publications on proline metabolism in plants (62, 108), prokaryotes (87), insects (28), and protozoans (42). Recent reviews have shown that the proline-dependent mechanisms may be universal in the biome (5, 46).…”