Changes in the physico-chemical properties of the xanthan produced by Xanthomonas citri subsp. citri in grapefruit leaf extract
Xanthan is a virulence factor produced by Xanthomonas spp. We previously demonstrated that this exopolysaccharide is not only essential for pathogenicity by contributing with bacterial survival but also its pyruvate substituents interfere with some plant defense responses. Deepening our studies abou...
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2019
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09596658_v29_n3_p269_Conforte http://hdl.handle.net/20.500.12110/paper_09596658_v29_n3_p269_Conforte |
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paper:paper_09596658_v29_n3_p269_Conforte2025-07-30T18:33:15Z Changes in the physico-chemical properties of the xanthan produced by Xanthomonas citri subsp. citri in grapefruit leaf extract grapefruit leaf extract xanthan Xanthomonas citri subsp. citri Xanthan is a virulence factor produced by Xanthomonas spp. We previously demonstrated that this exopolysaccharide is not only essential for pathogenicity by contributing with bacterial survival but also its pyruvate substituents interfere with some plant defense responses. Deepening our studies about xanthan properties and structure, the aim of this work was to analyze the characteristics of xanthan produced by Xanthomonas in different culture media. We analyzed the xanthan produced by Xanthomonas citri subsp. citri (Xcc) in leaf extracts from grapefruit (a susceptible host of this bacterium) and compared it with the xanthan produced in a synthetic culture medium. We found that the xanthan produced in the grapefruit extract (Xan-GLE) presented shorter and more disordered molecules than xanthan produced in the synthetic medium (Xan-PYM). Besides, Xan-GLE resulted less viscous than Xan-PYM. The disordered molecular conformation of Xan-GLE could be attributed to its higher pyruvilation degree and lower acetylation degree compared with those detected in Xan-PYM. Meanwhile, the difference in the viscosity of both xanthans could be due to their molecules length. Finally, we cultured Xcc in the presence of the Xan-GLE or Xan-PYM and observed the formation of biofilm-like structures in both cases. We found significant differences in biofilm architecture between the two conditions, being the biofilm produced in presence of Xan-GLE similar to that formed in canker lesions developed in lemon plant leaves. Together, these results show how xanthan structure and properties changed when Xcc grew in a natural substrate and can contribute to better understand the biological role of xanthan. © © The Author(s) 2019. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com. 2019 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09596658_v29_n3_p269_Conforte http://hdl.handle.net/20.500.12110/paper_09596658_v29_n3_p269_Conforte |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
grapefruit leaf extract xanthan Xanthomonas citri subsp. citri |
| spellingShingle |
grapefruit leaf extract xanthan Xanthomonas citri subsp. citri Changes in the physico-chemical properties of the xanthan produced by Xanthomonas citri subsp. citri in grapefruit leaf extract |
| topic_facet |
grapefruit leaf extract xanthan Xanthomonas citri subsp. citri |
| description |
Xanthan is a virulence factor produced by Xanthomonas spp. We previously demonstrated that this exopolysaccharide is not only essential for pathogenicity by contributing with bacterial survival but also its pyruvate substituents interfere with some plant defense responses. Deepening our studies about xanthan properties and structure, the aim of this work was to analyze the characteristics of xanthan produced by Xanthomonas in different culture media. We analyzed the xanthan produced by Xanthomonas citri subsp. citri (Xcc) in leaf extracts from grapefruit (a susceptible host of this bacterium) and compared it with the xanthan produced in a synthetic culture medium. We found that the xanthan produced in the grapefruit extract (Xan-GLE) presented shorter and more disordered molecules than xanthan produced in the synthetic medium (Xan-PYM). Besides, Xan-GLE resulted less viscous than Xan-PYM. The disordered molecular conformation of Xan-GLE could be attributed to its higher pyruvilation degree and lower acetylation degree compared with those detected in Xan-PYM. Meanwhile, the difference in the viscosity of both xanthans could be due to their molecules length. Finally, we cultured Xcc in the presence of the Xan-GLE or Xan-PYM and observed the formation of biofilm-like structures in both cases. We found significant differences in biofilm architecture between the two conditions, being the biofilm produced in presence of Xan-GLE similar to that formed in canker lesions developed in lemon plant leaves. Together, these results show how xanthan structure and properties changed when Xcc grew in a natural substrate and can contribute to better understand the biological role of xanthan. © © The Author(s) 2019. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com. |
| title |
Changes in the physico-chemical properties of the xanthan produced by Xanthomonas citri subsp. citri in grapefruit leaf extract |
| title_short |
Changes in the physico-chemical properties of the xanthan produced by Xanthomonas citri subsp. citri in grapefruit leaf extract |
| title_full |
Changes in the physico-chemical properties of the xanthan produced by Xanthomonas citri subsp. citri in grapefruit leaf extract |
| title_fullStr |
Changes in the physico-chemical properties of the xanthan produced by Xanthomonas citri subsp. citri in grapefruit leaf extract |
| title_full_unstemmed |
Changes in the physico-chemical properties of the xanthan produced by Xanthomonas citri subsp. citri in grapefruit leaf extract |
| title_sort |
changes in the physico-chemical properties of the xanthan produced by xanthomonas citri subsp. citri in grapefruit leaf extract |
| publishDate |
2019 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09596658_v29_n3_p269_Conforte http://hdl.handle.net/20.500.12110/paper_09596658_v29_n3_p269_Conforte |
| _version_ |
1840324335734095872 |