Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 182, Issue -, Pages 1670-1680Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.05.097
Keywords
Chitosan; RNA-seq; Potato plant defence; Phytophthora infestans; efficiency
Funding
- National Natural Science Foundation of China [32061130211, 32072507]
- Key-Area Research and Development Program of Guangdong Province [2020B020219002]
- Independent Innovation of Agricultural Sciences in Jiangsu Province [CX (18)3012]
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The study demonstrated that chitosan can enhance potato resistance and reduce Phytophthora infestans infection by activating important plant defence response pathways. In addition, chitosan triggers pattern recognition immune responses, induces systemic resistance, and alters gene expression related to plant defence in potato. These findings provide insights into chitosan-mediated activation of the immune system in potato and offer a potential eco-friendly strategy for controlling late blight in the field.
Late blight, caused by the oomycete Phytophthora infestans, is one of the most devastating diseases that results in huge losses of potato crops worldwide. Chitosan as a defence elicitor can induce plant innate immunity against pathogen infection, but the efficiency and specific defence mechanism of chitosan against late blight in potato have not been elaborated. In this study, we demonstrated that the application of chitosan significantly enhanced potato resistance and reduced P. infestans infection in potted potato and in the field. Large-scale transcriptomic analysis suggested that chitosan preferentially activated several important pathways related to the plant defence response. Notably, we revealed that chitosan triggered pattern-triggered immunity responses in potato. Chitosan could trigger pattern recognition receptors to initiate intracellular signalling, and gradually amplify the immune signal. qRT-PCR verification showed that chitosan induced the expression of defence-related genes in potato. Moreover, treatment with chitosan result in Induced Systemic Resistance (ISR) in potato, including an accumu-lation of plant hormone salicylic acid, increase in the level of phenylalanine ammonia lyase activity anda content decrease of malondialdehyde. These findings help elucidate chitosan-mediated activation of the immune system in potato and provide a potential ecofriendly strategy to control potato late blight in the field. (c) 2021 Elsevier B.V. All rights reserved.
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