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

文献类型： 外文期刊

作者： Zang, Haoyu 1 ; Xie, Shanshan 1 ; Zhu, Bichun 1 ; Yang, Xue 2 ; Gu, Chunyan 2 ; Hu, Benjin 2 ; Gao, Tongchun 2 ; Chen, Yu 2 ;

作者机构： 1.Nanjing Agr Univ, Coll Plant Protect, Key Lab Integrated Management Crop Dis & Pests, Minist Educ, Nanjing 210095, Jiangsu, Peoples R China

2.Anhui Acad Agr Sci, Inst Plant Protect & Agroprod Safety, Hefei 230031, Anhui, Peoples R China

3.Anhui Agr Univ, Coll Life Sci, Natl Key Engn Lab Crop Stress Resistance Breeding, Hefei 230036, Anhui, Peoples R China

关键词： Bacillus; danger-associated molecular pattern; defence response; degree of polymerization; mannan oligosaccharides; rice and tobacco

期刊名称：MOLECULAR PLANT PATHOLOGY （ 影响因子：5.663； 五年影响因子：5.626 ）

ISSN： 1464-6722

年卷期： 2019 年 20 卷 8 期

页码：

收录情况： SCI

摘要： 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. The expression levels of the defence-related genes PR-1a and LOX were both up-regulated after MOS treatment, suggesting that MOS may simultaneously activate salicylic acid and jasmonic acid-dependent signalling pathways. Furthermore, liquid chromatography-mass spectrometry analysis showed that MOS led to the accumulation of four phytoalexins (momilactone A, phytocassane A, phytocassane D, and phytocassane E) in rice seedling leaves within 12-24 h. Finally, MOS conferred resistance in rice and tobacco against Xanthomonas oryzae and Phytophthora nicotianae, respectively. Taken together, our results indicated that MOS, a novel DAMP, could trigger multiple defence responses to prime plant resistance and has a great potential as plant defence elicitor for the management of plant disease.

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