Publicações

@article{Nascimento2022,

title = {Overexpression of CsSAMT in Citrus sinensis Induces Defense Response and Increases Resistance to Xanthomonas citri subsp. citri},

author = {Cesar Augusto Nascimento and Natalia Sousa Teixeira-Silva and Raquel Caserta and Marcia Ortiz Mayo Marques and Marco Aurelio Takita and Alessandra A. Souza},

doi = {10.3389/FPLS.2022.836582/BIBTEX},

issn = {1664462X},

year  = {2022},

date = {2022-01-01},

journal = {Frontiers in Plant Science},

volume = {13},

pages = {820},

publisher = {Frontiers Media S.A.},

abstract = {Citrus canker is a destructive disease caused by Xanthomonas citri subsp. citri, which affects all commercial sweet orange (Citrus sinensis [L.] Osbeck) cultivars. Salicylic acid (SA) and systemic-acquired resistance (SAR) have been demonstrated to have a crucial role in mediating plant defense responses against this phytopathogen. To induce SAR, SA is converted to methyl salicylate (MeSA) by an SA-dependent methyltransferase (SAMT) and translocated systemically to prime noninfected distal tissues. Here, we generated sweet orange transgenic plants (based on cvs. Hamlin and Valencia) overexpressing the SAMT gene from Citrus (CsSAMT) and evaluated their resistance to citrus canker. We obtained four independent transgenic lines and confirmed their significantly higher MeSA volatilization compared to wild-type controls. Plants overexpressing CsSAMT showed reduced symptoms of citrus canker and bacterial populations in all transgenic lines without compromising plant development. One representative transgenic line (V44SAMT) was used to evaluate resistance response in primary and secondary sites. Without inoculation, V44SAMT modulated CsSAMT, CsNPR1, CsNPR3, and CsWRKY22 expression, indicating that this plant is in a primed defense status. The results demonstrate that MeSA signaling prompts the plant to respond more efficiently to pathogen attacks and induces immune responses in transgenic plants at both primary and secondary infection sites.},

keywords = {Citrus canker, MeSA, Methyl salicylate, Salicylic acid, systemic-acquired resistance},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Overexpression of Citrus reticulata SAMT in Nicotiana tabacum increases MeSA volatilization and decreases Xylella fastidiosa symptoms},

author = {Laura M. Gómez and Natália S. Teixeira-Silva and Raquel Caserta and Marco A. Takita and Márcia O. M. Marques and Alessandra A. Souza},

url = {https://link.springer.com/article/10.1007/s00425-020-03511-1},

doi = {10.1007/S00425-020-03511-1/METRICS},

issn = {14322048},

year  = {2020},

date = {2020-01-01},

journal = {Planta},

volume = {252},

issue = {6},

pages = {1-14},

publisher = {Springer Science and Business Media Deutschland GmbH},

abstract = {Main conclusion: Nicotiana tabacum overexpressing CrSAMT from Citrus reticulata increased production of MeSA, which works as an airborne signal in neighboring wild-type plants, inducing PR1 and increasing resistance to the pathogen Xylella fastidiosa. Abstract: Xylella fastidiosa is one of the major threats to plant health worldwide, affecting yield in many crops. Despite many efforts, the development of highly productive resistant varieties has been challenging. In studying host plant resistance, the S-adenosyl-l-methionine: salicylic acid carboxyl methyltransferase gene (SAMT) from Citrus reticulata, a X. fastidiosa resistant species, was upregulated in response to pathogen infection. SAMT is involved with the catalysis and production of methyl salicylate (MeSA), an airborne signal responsible for triggering systemic acquired resistance. Here we used tobacco as a model system and generated transgenic plants overexpressing C. reticulata SAMT (CrSAMT). We performed an in silico structural characterization of CrSAMT and investigated its biotechnological potential in modulating the immune system in transgenic plants. The increase of MeSA production in transgenic lines was confirmed by gas chromatography (GC–MS). The transgenic lines showed upregulation of PR1, and their incubation with neighboring wild-type plants activated PR1 expression, indicating that MeSA worked as an airborne signal. In addition, transgenic plants showed significantly fewer symptoms when challenged with X. fastidiosa. Altogether, these data suggest that CrSAMT plays a role in host defense response and can be used in biotechnology approaches to confer resistance against X. fastidiosa.},

keywords = {Methyl salicylate, Model plant, Salicylic acid, Salicylic acid methyltransferase, Systemic acquired resistance (SAR), Transgenic tobacco},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Overexpression of Citrus reticulata SAMT in Nicotiana tabacum increases MeSA volatilization and decreases Xylella fastidiosa symptoms},

author = {Laura M. Gómez and Natália S. Teixeira-Silva and Raquel Caserta and Marco A. Takita and Márcia O. M. Marques and Alessandra A. Souza},

url = {https://link.springer.com/article/10.1007/s00425-020-03511-1},

doi = {10.1007/S00425-020-03511-1/METRICS},

issn = {14322048},

year  = {2020},

date = {2020-01-01},

journal = {Planta},

volume = {252},

issue = {6},

pages = {1-14},

publisher = {Springer Science and Business Media Deutschland GmbH},

abstract = {Main conclusion: Nicotiana tabacum overexpressing CrSAMT from Citrus reticulata increased production of MeSA, which works as an airborne signal in neighboring wild-type plants, inducing PR1 and increasing resistance to the pathogen Xylella fastidiosa. Abstract: Xylella fastidiosa is one of the major threats to plant health worldwide, affecting yield in many crops. Despite many efforts, the development of highly productive resistant varieties has been challenging. In studying host plant resistance, the S-adenosyl-l-methionine: salicylic acid carboxyl methyltransferase gene (SAMT) from Citrus reticulata, a X. fastidiosa resistant species, was upregulated in response to pathogen infection. SAMT is involved with the catalysis and production of methyl salicylate (MeSA), an airborne signal responsible for triggering systemic acquired resistance. Here we used tobacco as a model system and generated transgenic plants overexpressing C. reticulata SAMT (CrSAMT). We performed an in silico structural characterization of CrSAMT and investigated its biotechnological potential in modulating the immune system in transgenic plants. The increase of MeSA production in transgenic lines was confirmed by gas chromatography (GC–MS). The transgenic lines showed upregulation of PR1, and their incubation with neighboring wild-type plants activated PR1 expression, indicating that MeSA worked as an airborne signal. In addition, transgenic plants showed significantly fewer symptoms when challenged with X. fastidiosa. Altogether, these data suggest that CrSAMT plays a role in host defense response and can be used in biotechnology approaches to confer resistance against X. fastidiosa.},

keywords = {Methyl salicylate, Model plant, Salicylic acid, Salicylic acid methyltransferase, Systemic acquired resistance (SAR), Transgenic tobacco},

pubstate = {published},

tppubtype = {article}

}