Dehydration of crop cells is the main damage caused by freezing injury. High content of glycine can make proteins highly flexible and mobile, promote the formation of intramolecular hydrogen bonds, and make protein molecules have an irregular curly configuration. High hydrophilicity can capture water molecules into cells, and protect cell structures from freezing and severe dehydration; At the same time, glycine and threonine remained soluble in cells, which improved the ability of crops to endure secondary dehydration stress during freezing; In addition, proline, serine, threonine, alanine and arginine are components of low temperature induced proteins, which provide a material basis for the synthesis of low temperature induced proteins and improve the cold resistance of crops
Amino acids can alleviate drought stress on crops. Lysine and tyrosine can increase various organic or inorganic osmoregulation substances in crops to regulate the concentration of cell fluid, reduce the osmotic potential, strengthen the water absorption or retention capacity of cells, and thus improve drought tolerance of crops. Alanine and histidine can adjust the opening and closing of stomata. Under drought conditions, stomata can be closed to reduce the amount of water lost due to transpiration, thus enhancing the drought resistance of crops
3. Anti-salt stress
Under salt stress, the oxygen free radicals harming crops increase, and cell membranes are destroyed. Proline can maintain the balance of ions inside and outside cells, reduce salt entering cells, provide signals for salt resistant genes, induce them to produce stable structures to protect cell membranes, and improve the activities of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD). As cleaners, they can remove oxygen free radicals in cells, Improve the salt tolerance of crops. The ion toxicity caused by salt stress can also damage the chloroplast structure, cause the degradation of chlorophyll, thereby weakening photosynthesis, making the accumulation of materials and energy insufficient, and inhibiting plant growth. Alanine, glutamic acid, glycine and lysine can promote the synthesis of chlorophyll, regulate the opening of stomata, thus promoting leaf photosynthesis, promoting crop growth and resisting crop salt damage
5. Anti-disease and pest
Alanine and threonine can improve the tolerance of crops, resist pathogens and pests, and enhance the disease resistance of crops. Phenylalanine can promote the synthesis of lignin, increase the thickness of cell wall, and enhance the resistance of crops to diseases and pests.
Amino acids can improve the lodging resistance of crops. On the one hand, phenylalanine can promote the synthesis of lignin, making the stalks of crops strong and not prone to lodging. On the other hand, arginine, tryptophan and histidine can enhance root development, promote the formation of strong roots of crops, and enhance the stress resistance of crops.
7.Alleviate heavy metal stress
Amino acids can chelate heavy metals in soil, make them inactive, and alleviate the stress of heavy metals on crops. For example, aspartic acid and cysteine can chelate cadmium, lead and zinc, thus reducing the toxicity of these heavy metals.
from amino acid expert & factory