A kinetic model for Xylella fastidiosa adhesion, biofilm formation, and virulence |
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Authors: | Osiro Denise Colnago Luiz Alberto Otoboni Alda Maria Machado Bueno Lemos Eliana Gertrudes Macedo de Souza Alessandra Alves Coletta Filho Helvécio Della Machado Marcos Antônio |
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Institution: | Embrapa Instrumentação Agropecuária, Rua XV de Novembro 1452, São Carlos SP 13560-970, Brazil;Instituto de Química de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-carlense 400, São Carlos, SP 13560-970, Brazil;Departamento de Tecnologia, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, Via de Acesso Prof. Dr. Paulo Donato Castelane s/n, Km 5, Jaboticabal SP 14884-900, Brazil;Centro APTA Citros 'Sylvio Moreira'/Instituto Agronômico - CP 04, Cordeirópolis SP 13490-970, Brazil;Embrapa Recursos Genéticos e Biotecnologia, Parque Estação Biológica W5 Norte Final, Brasília, DF 70770-900, Brazil |
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Abstract: | Xylella fastidiosa is the causal agent of citrus variegated chlorosis and Pierce's disease which are the major threat to the citrus and wine industries. The most accepted hypothesis for Xf diseases affirms that it is a vascular occlusion caused by bacterial biofilm, embedded in an extracellular translucent matrix that was deduced to be the exopolysaccharide fastidian. Fourier transform infrared spectroscopy analysis demonstrated that virulent cells which form biofilm on glass have low fastidian content similar to the weak virulent ones. This indicates that high amounts of fastidian are not necessary for adhesion. In this paper we propose a kinetic model for X. fastidiosa adhesion, biofilm formation, and virulence based on electrostatic attraction between bacterial surface proteins and xylem walls. Fastidian is involved in final biofilm formation and cation sequestration in dilute sap. |
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Keywords: | Xylella fastidiosa FTIR Biofilm Adhesion Virulence |
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