Salicylic acid (SA) Produced from Chengdu Agreenco Bio Tech, is used as a kind of high-effective bio-stimulant for plants to resist the disease, resist the cold, resist the salty soil, induce plant flowering, stimulate the seeds germinations, and Salicylic acid is also known as ortho hydroxyformic acid, is a type of small molecule phenolic substance widely present in plants. It is an intermediate product in the phenylalanine metabolic pathway and is a derivative of cinnamic acid. Participate in various physiological and biochemical processes of plants, such as transpiration, seed germination, flowering, fruiting, stomatal closure, and heat production; Inducing plants to develop various physiological traits such as disease resistance, salt resistance, and cold tolerance, as well as participating in cyanide resistant respiration and non phosphorylation pathways of plant cell mitochondria, can improve the level of jasmonic acid metabolism in plants.
(1).Salicylic acid induces plant disease resistance mechanism:
The salicylic acid receptor protein gene in plants is highly homologous to the peroxidase gene, and exogenous salicylic acid entering the body can directly activate the activity of many enzyme systems related to resistance; Meanwhile, salicylic acid also participates in the regulation of jasmonic acid metabolism in plants, which can enhance the plant's stress resistance to various stresses. Many studies have also shown that salicylic acid can significantly increase the activity of SOD and inhibit the activity of CAT (catalase) and APX (ascorbate peroxidase); The increase in SOD activity can promote the large-scale production of H2O2 in plants, while CAT and APX are important scavengers of H2O2 in plants. By binding with salicylic acid, their activity is inhibited, leading to the accumulation of H2O2. H2O2 induces allergic necrosis in plant cells and also has direct toxicity to microorganisms. H2O2 also participates in the oxidative cross-linking of cell wall proteins (such as glycoproteins) and the formation of lignin, which can reinforce the cell wall and act as a structural defense barrier to prevent further microbial invasion.
(2). Salicylic acid from Agreenco induces plant cold tolerance mechanism
Under low temperature stress conditions, salicylic acid can accumulate in the hydrophobic zone of the cell membrane, affecting a series of physiological and biochemical reactions related to the membrane. Exogenous salicylic acid can increase the germination rate, germination index and other vitality indicators of rice seeds, which is related to the fact that under low temperature stress conditions, salicylic acid can increase the activity of amylase, protease and soluble sugar content in rice endosperm. The increase in soluble substance content brings two effects: one is to provide sufficient substrates for the synthesis and accumulation of new substances; The second is to increase the concentration of intracellular solutes, reduce the osmotic potential of solutes in cells, enhance their osmotic regulation effect, alleviate the biophysical and biochemical changes caused by cold stress on cells, such as biofilm phase transition and electrolyte leakage, thereby relatively improving cold tolerance.
(3).Salicylic acid from Agreenco induces salt tolerance mechanism in plants
Resistant plants can specifically secrete organic acids such as citric acid, oxalic acid, and malic acid from their root tips shortly after exposure to A13+(minutes to hours), and the 1-2cm area of the root tip has been shown to be the main site for organic acid secretion. Organic acids secreted from the root system can bind with A13+in the rhizosphere to form non-toxic chelates, thereby reducing the toxicity of aluminum to rhizosphere cells.
2.Application of salicylic acid from Agreenco in agriculture.
Salicylic acid from Agreenco is non-toxic, harmless, and very convenient to use. Its non-toxic characteristics are in line with the development trend of modern agriculture, so it can be widely used in agriculture. In addition, salicylic acid can be used as an additive to make agricultural preparations, which can increase crop yield, improve crop quality, enhance crop resistance, and enhance the competitiveness of agricultural products in the market.
(1).Salicylic acid from Agreenco induced flowering: Salicylic acid is related to inducing flowering, and it has been proven that there are dozens of plants that can induce flowering with salicylic acid. Among them, the induction of flowering in many ornamental plants provides new ideas for the physiological regulation of horticultural plants.
(2).Promote high-quality and high-yield crops: Low concentration salicylic acid treatment significantly enhances crop synthesis metabolism, increases grain weight and number, increases yield, and improves quality.
(3).External application of salicylic acid can improve crop resistance and tolerance to adversity: Most plants, including rice, corn, wheat, rapeseed, tomatoes, beans, cucumbers, garlic, soybeans, sugar beets, and tobacco, have a certain effect on improving crop salt resistance, drought resistance, and cold resistance after application of salicylic acid.
(4).Improve crop cold tolerance: Early rice seedlings are susceptible to low temperature damage, and exogenous salicylic acid can reduce the damage of low temperature stress to rice under 4 ℃ cold damage conditions. Inhibition of germination at low concentrations (15mol/L). Salicylic acid solution can enhance the resistance of cucumber seedlings at the four leaf stage to high temperature stress, with the optimal effect at 50mmol/L. As the concentration increases, the alleviating effect on high temperature stress decreases.
(5).Improve the storage performance of fruits: After treatment with salicylic acid, the cell membrane permeability and malondialdehyde content of apples decreased, the respiratory rate significantly decreased, and fruit aging was delayed. Similar results have been obtained in the study of fruits such as pears, peaches, and citrus. This may be related to the ability of salicylic acid to inhibit the production of ethylene. Observing the production of ethylene in potatoes treated with salicylic acid proves that the inhibitory effect of salicylic acid on ethylene is related to the concentration of salicylic acid, temperature, and physiological state of potato chunks.
(6).Preservation effect on fresh cut flowers: Salicylic acid has a certain effect on the preservation of fresh flowers and can significantly inhibit the growth of bacteria. After treatment, the flowering time of roses was significantly prolonged. Most fresh cut flowers exhibit similar results, but there are exceptions, such as the addition of salicylic acid to carnation cut flowers, which completely inhibits the synthesis of phytohormones and causes the cut flowers to lose resistance to fungal infections.
(7).Inducing rice sterile lines to close their glumes: Increasing the vitality of hybrid seeds by 2mmol/L methyl jasmonate (MeJA) significantly induces rice to open glumes. Hybrid seed production supplemented by artificial pollination can increase the seed setting rate. However, the increase in the cracking rate of rice grains severely reduces the seed vitality of hybrid rice seeds; Research has found that 1mmol/L salicylic acid can reverse MeJA induced rice grain opening, while MeJA treatment can relieve the inhibitory effect of salicylic acid on sterile line grain opening. In rice hybrid seed production, the application of salicylic acid after pollination can greatly improve the vitality and seed storage tolerance of rice hybrids, reducing losses. If a new product of salicylic acid can be developed for rice hybrid seed production, it will have great market prospects.
