Molecular characterization of HEXOKINASE1 in plant innate immunity

Hexokinase1 (HXK1) is an Arabidopsis glucose sensor that has a variety of roles during plant growth and devlopment, including during germination, flowering, and senescence. HXK1 also acts as a positive regulator of plant immune responses. Previous research suggested that HXK1 might influence plant i...

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Published in:Applied biological chemistry 2020, 63(6), , pp.1-10
Main Authors: Jing, Wu, Uddin, Shahab, Chakraborty, Rupak, Van Anh, Duong Thu, Macoy, Donah Mary, Park, Si On, Ryu, Gyeong Ryul, Kim, Young Hun, Cha, Joon‑Yung, Kim, Woe-Yeon, Kim, Min Gab
Format: Article
Language:English
Subjects:
Applied Microbiology
Arabidopsis
Bacteria
Biological Techniques
Bioorganic Chemistry
Chemistry
Chemistry and Materials Science
Effectors
Flowering
Germination
Glucose
Gram-negative bacteria
Immune response
Innate immunity
Membrane proteins
Pathogenesis
Plant growth
Plant immunity
Proteins
Senescence
Signs and symptoms
Tomatoes
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Summary:Hexokinase1 (HXK1) is an Arabidopsis glucose sensor that has a variety of roles during plant growth and devlopment, including during germination, flowering, and senescence. HXK1 also acts as a positive regulator of plant immune responses. Previous research suggested that HXK1 might influence plant immune responses via responses to glucose. Plant immune responses are governed by two main pathways: PAMP-triggered immunity (PTI) and effector-triggered immunity (ETI). PTI involves the recognition of Pathogen-Associated Molecular Patterns (PAMPs) and leads to increased callose formation and accumulation of pathogenesis response (PR) proteins. ETI acts in response to effectors secreted by Gram-negative bacteria. During ETI, the membrane-localized protein RPM1-interacting protein 4 (RIN4) becomes phosphorylated in reponse to interactions with effectors and mediates the downstream response. In this study, the effects of glucose on plant immune responses against infection with Pseudomonas syringae pv. tomato DC3000 and other P. syringae strains were investigated in the presence and absence of HXK1. Infiltration of leaves with glucose prior to infection led to decreases in bacterial populations and reductions in disease symptoms in wild-type Arabidopsis plants, indicating that glucose plays a role in plant immunity. Both PTI and ETI responses were affected. However, these effects were not observed in a hxk1 mutant, indicating that the effects of glucose on plant immune responses were mediated by HXK1-related pathways.
ISSN:2468-0834
2468-0842
DOI:10.1186/s13765-020-00560-8