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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Differential colonization patterns of Xylella fastidiosa infecting citrus genotypes

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Niza, B. [1, 2] ; Coletta-Filho, H. D. [1] ; Merfa, M. V. [1, 2] ; Takita, M. A. [1] ; de Souza, A. A. [1]
Total Authors: 5
[1] Inst Agron Campinas, Ctr Citricultura Sylvio Moreira, Sao Paulo - Brazil
[2] Univ Estadual Campinas, Inst Biol, Dept Genet Evolucao & Bioagentes, Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: PLANT PATHOLOGY; v. 64, n. 6, p. 1259-1269, DEC 2015.
Web of Science Citations: 15

Xylella fastidiosa is a phytopathogenic bacterium that causes disease in many different crops worldwide. In Brazil, X. fastidiosa subsp. pauca causes citrus variegated chlorosis (CVC), which is a disease responsible for economic losses in the citrus agribusiness. Variable host responses to bacterial colonization and disease development have been observed. This work studies the colonization processes of a pathogenic GFP-labelled X. fastidiosa citrus strain in sweet orange (susceptible) and tangor (resistant) parents and two resulting hybrids that exhibited contrasting responses to CVC. Xylella fastidiosa showed increased populations and movement in the susceptible genotypes, but slower compared to other hosts such as grapevine. Scanning electron microscopy revealed that the predominant pitted stem morphology in citrus makes the bacterial movement difficult. In susceptible genotypes X. fastidiosa can move from the primary to the secondary xylem, whilst it is confined to the primary xylem in resistant plants. Associated with this is an induction of lignification that occurs earlier in the resistant genotypes when in the presence of the pathogen, and represents a genetic mechanism that leads to formation of a physical barrier, impairing bacterial colonization. (AU)

FAPESP's process: 13/17485-7 - Functional study of genes associated with plant defense to pathogens: focus on the control of Xylella fastidiosa, the causal agent of citrus variegated chlorosis
Grantee:Alessandra Alves de Souza
Support Opportunities: Regular Research Grants
FAPESP's process: 08/57909-2 - Genomic platforms applied to citrus breeding
Grantee:Marcos Antonio Machado
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 11/14307-5 - Study of Xylella fastidiosa-host interaction: effect of movement and colonization in plant and transmission by insect vector
Grantee:Bárbara Caroline Niza Silva
Support Opportunities: Scholarships in Brazil - Master