Alginate oligosaccharide(AOS) is a small molecule active substance with a degree of polymerization of less than 20 through different degradation methods (acid degradation method, enzyme degradation method, oxidative degradation method). Compared with alginic acid, small molecule alginate oligosaccharide is Sugar has physical and chemical properties such as strong water solubility, easy absorption, high stability, safety and non-toxicity. It is also very effective in promoting growth, inducing resistance (inducing resistance), and inhibiting bacteria.
The functions of alginate oligosaccharides with different molecular weights are related to the degree of polymerization of the oligosaccharides: for example, trisaccharides, tetrasaccharides, pentasaccharides, and hexasaccharides have the strongest activity in promoting growth, and oligosaccharides with a degree of polymerization of 3-5 have the strongest activity in promoting root growth. Only oligosaccharides of a specific length have elicitor activity and induce crop immune responses. Oligosaccharides with a degree of polymerization that is too small cannot induce defense responses in plants. Oligosaccharides with a degree of polymerization that is too large cannot contact the cell membrane due to the barrier function of the cell wall. Therefore, the effects of alginate oligosaccharides on crops are also quite different depending on the degree of polymerization.
Functions of alginate oligosaccharide:
As a signaling molecule, alginate oligosaccharide is involved in regulating the growth, development and metabolic processes of plants. By regulating the biosynthesis level of active substances in cells, it can resist adversity stress and promote growth.
1) Alginate oligosaccharide improve crop stress resistance
When plants are attacked by pathogenic bacteria, the SA salicylic acid pathway becomes one of the most relevant pathways for up-regulation of resistance gene expression. AOS plays a key role in the resistance to Pst DC3000 virus by inducing the SA pathway. AOS can simulate the cell wall structure of pathogens and act as a signaling substance to activate the plant’s salicylic acid pathway, thereby improving plant resistance to viruses.
Alginate oligosaccharides have elicitor activity, activate the expression of crop stress resistance genes, increase the content of betaine, proline, and soluble sugars in cells, effectively alleviate frost damage, drought and other adversity damage, and improve crop autoimmunity.
2) Alginate oligosaccharides promote crop growth
As a signaling molecule, AOS participates in plant growth regulation activities and regulates plant growth, development, and reproduction. It can induce the expression of auxin-related genes, accelerate the synthesis and transformation of auxin, promote crop growth, and thereby improve Crop yield and quality.
3) Alginate oligosaccharide has rooting effect
AOS can increase the expression of auxin-related genes, promote the synthesis and transportation of above-ground auxin (IAA). And it enable more IAA to be transported to the root system. Thereby it can promot root growth.
Wellyou Tech’s alginate oligosaccharides are extracted from imported wild Ascophyllum nodosum and subjected to secondary enzymatic hydrolysis to degrade macromolecular alginic acid into AOS with a specific degree of polymerization without destroying the original active ingredients of the seaweed.
High-performance gel permeation chromatography (HPGPC) is used to detect various beneficial substances containing: mannitol, betaine, gibberellins, cytokinins, vitamins, amino acids, seaweed polysaccharides, seaweed enzymes, etc. The polymerization degree of AOS is mainly distributed in 2 -9, has good rooting, stress resistance, and growth-promoting effects.
