Vol. 7, Issue 2 (2019)
Role of cold responsive gene (COR), late embryogenesis abundant (LEA) and anti freeze proteins (AFPs) in chilling stress tolerance
Author(s): Sheikh Mansoor, Vikas Sharma, Meinaz Nissar, Nida Yousuf, Khalid Z Masoodi
Abstract: Plants feel stress under high as well as low temperature exposure. At lower temperatures, stress tolerance can be induced by exposure to reduced temperature and is known as chilling tolerance or cold acclimation. Chilling tolerance is the ability of a plant to tolerate low temperatures (0–15 ◦C) without injury or damage. Both cold acclimation and chilling tolerance involve an array of biochemical, molecular and metabolic processes. Plants adjust their metabolism that gets altered due to rise or fall of temperature by synthesizing stress-responsive metabolites particularly include soluble sugars, amino acids, organic acids, polyamines and lipids, Antifreeze proteins (AFPs) and Cold stress-induced genes known as cold-responsive genes (COR). Most of such genes encoding polypeptides are homolog’s of late embryogenesis abundant proteins (LEA) and the polypeptides that are synthesized during the late embryogenesis phase. These late embryogenesis abundant-like proteins are mainly hydrophilic and have relatively simple amino-acid composition. The expression of cold responsive genes has been shown to be critical for both chilling tolerance and cold acclimation in plants. In this short review we have summarized the cellular and physiological changes occurring during chilling and role of COR, AFP in tolerance to chilling stress.