Mannan oligosaccharides trigger multiple defence responses in rice and tobacco as a novel danger-associated molecular pattern.

ABSTRACT: Oligosaccharide, a typical danger-associated molecular pattern (DAMP), has been studied and applied as plant defence elicitor for several years. Here, we report a novel oligosaccharide, mannan oligosaccharide (MOS) with a degree of polymerization of 2-6, which was hydrolysed from locust bean gum by a newly reported enzyme, BpMan5. The MOS treatment can significantly enhance the generation of signalling molecules such as intracellular Ca²⁺ and reactive oxygen species. Subsequent defence events like stomata closure and cell death were also caused by MOS, eventually leading to the prevention of pathogen invasion or expansion. Transcriptional expression assay indicated that MOS activated mitogen-activated protein kinase cascades in tobacco and rice via different cascading pathways.

SUBMITTER: Zang H 

PROVIDER: S-EPMC6640537 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature