‘Candidatus Liberibacter asiaticus’-Encoded BCP Peroxiredoxin Suppresses Lipopolysaccharide-Mediated Defense Signaling and Nitrosative Stress In Planta
Journal Article
·
· Molecular Plant-Microbe Interactions
- Univ. of Florida, Gainesville, FL (United States); University of Florida
- Univ. of Florida, Gainesville, FL (United States)
- Univ. of Georgia, Athens, GA (United States)
- Florida State Univ., Tallahassee, FL (United States)
The lipopolysaccharides (LPS) of gram-negative bacteria trigger a nitrosative and oxidative burst in both animals and plants during pathogen invasion. Liberibacter crescens strain BT-1 is a surrogate for functional genomic studies of the uncultured pathogenic ‘Candidatus Liberibacter’ spp. that are associated with severe diseases such as citrus greening and potato zebra chip. Structural determination of L. crescens LPS revealed the presence of a very long chain fatty acid modification. L. crescens LPS pretreatment suppressed growth of Xanthomonas perforans on nonhost tobacco (Nicotiana benthamiana) and X. citri subsp. citri on host orange (Citrus sinensis), confirming bioactivity of L. crescens LPS in activation of systemic acquired resistance (SAR). L. crescens LPS elicited a rapid burst of nitric oxide (NO) in suspension cultured tobacco cells. Pharmacological inhibitor assays confirmed that arginine-utilizing NO synthase (NOS) activity was the primary source of NO generation elicited by L. crescens LPS. LPS treatment also resulted in biological markers of NO-mediated SAR activation, including an increase in the glutathione pool, callose deposition, and activation of the salicylic acid and azelaic acid (AzA) signaling networks. Transient expression of ‘Ca. L. asiaticus’ bacterioferritin comigratory protein (BCP) peroxiredoxin in tobacco compromised AzA signaling, a prerequisite for LPS-triggered SAR. Western blot analyses revealed that ‘Ca. L. asiaticus’ BCP peroxiredoxin prevented peroxynitrite-mediated tyrosine nitration in tobacco. ‘Ca. L. asiaticus’ BCP peroxiredoxin (i) attenuates NO-mediated SAR signaling and (ii) scavenges peroxynitrite radicals, which would facilitate repetitive cycles of ‘Ca. L. asiaticus’ acquisition and transmission by fecund psyllids throughout the limited flush period in citrus.
- Research Organization:
- Univ. of Georgia, Athens, GA (United States). Complex Carbohydrate Research Center
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Institute of Food and Agriculture Specialty Crops Research Initiative (NIFA-SCRI)
- Grant/Contract Number:
- SC0015662
- OSTI ID:
- 1963234
- Journal Information:
- Molecular Plant-Microbe Interactions, Journal Name: Molecular Plant-Microbe Interactions Journal Issue: 3 Vol. 35; ISSN 0894-0282
- Publisher:
- APS Press - International Society for Molecular Plant-Microbe InteractionsCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
Bacteria-plant symbiosis
Bacterial pathogenesis
Citrus greening
Effectors
Elicitors
Ethylene
Huanglongbing
Innate immunity
Jasmonic acid
Liberibacter
Lipid A
Lipopolysaccharide
Molecular signaling
Nitric oxide
Plant responses to pathogens
Salicylic acid
Systemic acquired resistance
Zebra chip
Bacteria-plant symbiosis
Bacterial pathogenesis
Citrus greening
Effectors
Elicitors
Ethylene
Huanglongbing
Innate immunity
Jasmonic acid
Liberibacter
Lipid A
Lipopolysaccharide
Molecular signaling
Nitric oxide
Plant responses to pathogens
Salicylic acid
Systemic acquired resistance
Zebra chip