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Many mechanisms have been proposed to explain the damage induced by freezing-thawing cycle, and oxidative stress caused by uncontrollable production of harmful reactive oxygen species ROS are partially contributed to causing the injury.
There have been extensive studies on the activities of antioxidant enzymes and the gene regulation, however, more researches will be required in near future to elucidate the most effective antioxidant enzymes to induce highest freezing tolerance in a crop plant in a transformation process or a breeding program.
The Groin Physiology Zdiger.
Scientific Research An Academic Publisher. Journal of Agricultural Chemistry and EnvironmentVol.
All the editikn summarized here can be applied for developing crop and horticultural plants to have more freezing tolerance for higher production with better quality. Kwang-Hyun BaekDaniel Z.
A complicated enzymatic system have been evolved in plants to scavenge the ROS to protect themselves from oxidative stress, therefore, cold-acclimating plants are expected to increase the de novo synthesis of the genes of antioxidant genes. Indeed, many antioxidant genes increase the expression levels in response to low temperature.
plant physiology taiz 4th edition
Furthermore, the higher expression of many antioxidant enzymes are positively correlated to inducing higher tolerance levels against freezing. As one of the most severe environmental stresses, freezing stress can determine native flora in nature and severely reduce crop production. Production of reactive oxygen species by freezing stress and the protective roles of antioxidant enzymes in plants.
Plants in temperate regions have evolved a unique but effective metabolism of protecting themselves called cold acclimation. The Biological Pigments in Plants Physiology. Cold-acclimating plants undergo a complex but orchestrated metabolic process to increase cold hardness triggered by exposure to low temperature and shortened photoperiod and achieve the maximum freezing tolerance by a concerted regulation and expression of physiolkgy number of plant physiology taiz and zeiger 4th edition responsive genes.