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2019
Oliveira, Tiago Silva; Granato, Laís Moreira; Galdeano, Diogo Manzano; Marques, João Paulo Rodrigues; Coerini, Luciane Fender; Machado, Juliana Freitas-Astúa Marcos Antonio; Oliveira, Tiago Silva; Granato, Laís Moreira; Galdeano, Diogo Manzano; Marques, João Paulo Rodrigues; Coerini, Luciane Fender; Machado, Juliana Freitas-Astúa Marcos Antonio
Genetic analysis of salicylic acid-mediated defenses responses and histopathology in the huanglongbing pathosystem Journal Article
In: Citrus Research & Technology, vol. 40, pp. 1-13, 2019, ISSN: 21775419.
Abstract | Links | BibTeX | Tags: callose deposition, Gene expression, Index terms: SAR, plant-pathogen interaction
@article{Oliveira2019,
title = {Genetic analysis of salicylic acid-mediated defenses responses and histopathology in the huanglongbing pathosystem},
author = {Tiago Silva Oliveira and Laís Moreira Granato and Diogo Manzano Galdeano and João Paulo Rodrigues Marques and Luciane Fender Coerini and Juliana Freitas-Astúa Marcos Antonio Machado and Tiago Silva Oliveira and Laís Moreira Granato and Diogo Manzano Galdeano and João Paulo Rodrigues Marques and Luciane Fender Coerini and Juliana Freitas-Astúa Marcos Antonio Machado},
url = {http://www.citrusrt.periodikos.com.br/article/doi/10.4322/crt.18419},
doi = {10.4322/CRT.18419},
issn = {21775419},
year = {2019},
date = {2019-01-01},
journal = {Citrus Research & Technology},
volume = {40},
pages = {1-13},
publisher = {Centro de Citricultura Sylvio Moreira/Instituto Agronômico},
abstract = {The emergence of citrus huanglongbing (HLB) has been a constraint for worldwide citrus growers. HLB disease is associated to species of the biothrophic bacteria Candidatus Liberibacter spp. (CaL). In this study, we assessed the transcriptional status of salicylic acid (SA) genes and associated defenses between two contrasting citrus genotypes during challenge with Ca. Liberibacter asiaticus or Ca. Liberibacter americanus. Citrus sinensis exhibited the most evident alterations in gene expression of evaluated genes, when compared with Poncirus trifoliata. Upstream pathway SA genes showed a slight upward regulation in C. sinensis. Salicylic acid biosynthesis and accumulation might be impaired as we observed a low expression level of SA biosynthesis related genes. Moreover, genes associated to SA metabolism showed a slight induction. These results may account for the absence of significant downstream defense response related to salicylic acid. Leaf anatomical analysis revealed callose accumulation in both HLB infected, C. sinensis and P. trifoliata sieve tube elements (STE), although only C. sinensis exhibited collapsed STE. Our data corroborate other studies and suggest that the SA biosynthesis and metabolism related genes might be involved in the contrasting response to CaL in different citrus genotypes. Additionally, we suggest that collapsed STE might have a prominent implication in symptomatology of highly susceptible plants.},
keywords = {callose deposition, Gene expression, Index terms: SAR, plant-pathogen interaction},
pubstate = {published},
tppubtype = {article}
}
The emergence of citrus huanglongbing (HLB) has been a constraint for worldwide citrus growers. HLB disease is associated to species of the biothrophic bacteria Candidatus Liberibacter spp. (CaL). In this study, we assessed the transcriptional status of salicylic acid (SA) genes and associated defenses between two contrasting citrus genotypes during challenge with Ca. Liberibacter asiaticus or Ca. Liberibacter americanus. Citrus sinensis exhibited the most evident alterations in gene expression of evaluated genes, when compared with Poncirus trifoliata. Upstream pathway SA genes showed a slight upward regulation in C. sinensis. Salicylic acid biosynthesis and accumulation might be impaired as we observed a low expression level of SA biosynthesis related genes. Moreover, genes associated to SA metabolism showed a slight induction. These results may account for the absence of significant downstream defense response related to salicylic acid. Leaf anatomical analysis revealed callose accumulation in both HLB infected, C. sinensis and P. trifoliata sieve tube elements (STE), although only C. sinensis exhibited collapsed STE. Our data corroborate other studies and suggest that the SA biosynthesis and metabolism related genes might be involved in the contrasting response to CaL in different citrus genotypes. Additionally, we suggest that collapsed STE might have a prominent implication in symptomatology of highly susceptible plants.