Small molecule compounds—-plant hormones and their derivatives (salicylic acid (SA), auxin (IAA), naphthaleneacetic acid (NAA), benzothiadiazole S-methyl ester (BTH), brassinosteroids (BR), etc.), natural secondary metabolites and their derivatives (AHO, DSF, ZNC, etc.).
Carbohydrates—polysaccharides (pectin (oligogalacturonic acid, etc.), chitosan, β-glucan, alginate, chitin, etc.), oligosaccharides (chitooligosaccharides, oligoglucose, chitosan, etc.), lipopolysaccharides (LPS from various microorganisms, JY001, etc.).
Proteins and peptides—polypeptides (flagellar peptide flg22, etc.), proteins (hypersensitive protein Harpin, Alternaria superfine protein, cryptoprotein, VDAL, etc.), oomycete protein, glycoprotein.
Others— microorganisms, lipids, nucleic acids (guanine glycosides), vitamin B1, inorganic salts, non-protein amino acids, azelaic acid, dihydrochlorin iron, 3-phosphoglycerol and dehydroabietin, etc.
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