Levan differentially primes barley defence against infections by Fusarium graminearum , Rhizoctonia solani and Pyricularia oryzae

The widespread use of pesticides poses significant challenges to the safety of agricultural products and the ecological environment. Levan‐type fructans have the ability to act as an induced resistance stimulus, enhancing plant disease resistance, which aligns with the principles of green developmen...

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Bibliographic Details
Published in:Plant pathology 2024-05, Vol.73 (4), p.859-872
Main Authors: Lian, Dan, Shui, Chen, Yang, Ling, Cheng, Yu, Zheng, Shicheng, Shen, Huiquan, Öner, Ebru Toksoy, Liang, Mingxiang
Format: Article
Language:English
Subjects:
Agricultural products
Ascorbic acid
Barley
Chitosan
Disease resistance
Fructans
Fusarium graminearum
Green development
Hydrogen
Hydrogen peroxide
Hydrogen peroxide content
Jasmonic acid
L-Ascorbate peroxidase
Leaves
Levan
Levans
Levansucrase
Oligosaccharides
Pathogens
Peroxidase
Pesticides
Plant diseases
Plant immunity
Polysaccharides
Product safety
Proline
Rhizoctonia solani
Salicylic acid
Spraying
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Summary:The widespread use of pesticides poses significant challenges to the safety of agricultural products and the ecological environment. Levan‐type fructans have the ability to act as an induced resistance stimulus, enhancing plant disease resistance, which aligns with the principles of green development. This study showed that levan polysaccharide, produced by Halomonas smyrnnensis levansucrase, could induce the resistance of barley to Fusarium graminearum much better than inulin‐type fructans or low‐molecular‐weight chitosan oligosaccharide. Three different application methods of levan, namely seed soaking, leaf spraying or their combination, all decreased the necrotic areas caused by F. graminearum and Rhizoctonia solani . When inoculated with F . graminearum , the content of hydrogen peroxide, proline or jasmonic acid and the activities of peroxidase and ascorbate peroxidase in levan‐treated barley were higher than those in the control. In contrast, when inoculated with R . solani , the hydrogen peroxide content and peroxidase activity in levan‐treated leaves showed a faster induction than the control at the early priming and the content of proline and methyl salicylate was higher than that of the control. Thus, levan induces distinct pathways in response to different pathogens.
ISSN:0032-0862
1365-3059
DOI:10.1111/ppa.13854