Lentinan is a new type of natural functional polysaccharide isolated from Lentinus edodes fruiting body that can reduce damage caused by oxygen free radicals to organelles and has a good inhibitory effect on plant diseases. Lentinan could promote the elongation of the roots but has no effect on dry weight since the concentration of lentinan in plant is low . Lentinan primary structure is a β-1,3-glucan, which is a major component of cell walls of bacteria, fungi, seaweeds and plants. The biological activity of lentinan is closely related to its structure.
These properties depend on the primary structure of the glucan, such as the degree of polymerization and branching. It has been reported that Lentinan exists as a right-handed triple-helical conformation in an aqueous solution.
Trotel-Aziz et al. found that β-1,3-glucan has a good controlling effect on grape powdery mildew and grape downy mildew .
Ménard et al. also found that β-1,3-glucan sulfate can induce tobacco disease resistance.
In recent years, a substantial amount of evidence has shown that the plant’s inherent immunity plays a role in R. solani infection. Moreover, many resistance proteins against R. solani infection have been identified, such as enzymes in the glycolytic pathway, chitinase and glutathione peroxidase.
source:https://doi.org/10.3390/agriculture12010075
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