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Potential Mechanisms of AtNPR1 Mediated Resistance against Huanglongbing (HLB) in Citrus

Authors
  • Qiu, Wenming1, 2
  • Soares, Juliana2
  • Pang, Zhiqian2
  • Huang, Yixiao2
  • Sun, Zhonghai1
  • Wang, Nian2
  • Grosser, Jude2
  • Dutt, Manjul2
  • 1 (Z.S.)
  • 2 (J.G.)
Type
Published Article
Journal
International Journal of Molecular Sciences
Publisher
MDPI AG
Publication Date
Mar 16, 2020
Volume
21
Issue
6
Identifiers
DOI: 10.3390/ijms21062009
PMID: 32187998
PMCID: PMC7139736
Source
PubMed Central
Keywords
License
Green

Abstract

Huanglongbing (HLB), a bacterial disease caused by Candidatus Liberibacter asiaticus ( C Las), is a major threat to the citrus industry. In a previous study conducted by our laboratory, several citrus transgenic trees expressing the Arabidopsis thaliana NPR1 ( AtNPR1 ) gene remained HLB-free when grown in a field site under high HLB disease pressure. To determine the molecular mechanisms behind AtNPR1- mediated tolerance to HLB, a transcriptome analysis was performed using AtNPR1 overexpressing transgenic trees and non-transgenic trees as control, from which we identified 57 differentially expressed genes (DEGs). Data mining revealed the enhanced transcription of genes encoding pathogen-associated molecular patterns (PAMPs), transcription factors, leucine-rich repeat receptor kinases (LRR-RKs), and putative ankyrin repeat-containing proteins. These proteins were highly upregulated in the AtNPR1 transgenic line compared to the control plant. Furthermore, analysis of protein–protein interactions indicated that AtNPR1 interacts with CsNPR3 and CsTGA5 in the nucleus. Our results suggest that AtNPR1 positively regulates the innate defense mechanisms in citrus thereby boosting resistance and effectively protecting the plant against HLB.

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