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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.)

Nutritional deficiency in citrus with symptoms of citrus variegated chlorosis disease

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Silva-Stenico, M. E. [1] ; Pacheco, F. T. H. [1] ; Pereira-Filho, E. R. [2] ; Rodrigues, J. L. M. [3] ; Souza, A. N. [1] ; Etchegaray, A. [4] ; Gomes, J. E. [1] ; Tsai, S. M. [1]
Total Authors: 8
[1] Univ Sao Paulo, Ctr Energia Nucl Agr, Lab Biol Celular & Mol, BR-13400970 Piracicaba, SP - Brazil
[2] Univ Fed Sao Carlos, Ctr Ciencias Exatas & Tecnol, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Texas Arlington, Dept Biol, Arlington, TX 76019 - USA
[4] Pontificia Univ Catolica PUC Campinas, Fac Quim, BR-13012970 Campinas, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Brazilian Journal of Biology; v. 69, n. 3, p. 859-864, AUG 2009.
Web of Science Citations: 7

It is well known that citrus plants that have been infected by Xylella fastidiosa display nutritional deficiencies, probably caused by production of extracellular polymers by the bacteria that block normal nutrient flow through the xylem. The aim of this work was to study the mineral composition of specific foliar areas in different stages of infection in citrus. Thus, the concentrations of macro and micronutrients in leaves of citrus infected by X. fastidiosa were measured. Samples from four infected citrus orchards in the State of Sao Paulo, Brazil, were respectively collected from Santa Rita do Passa Quatro, Neves Paulista, Gaviao Peixoto and Paraiso counties. The presence of X. fastidiosa in leaves was confirmed by polymerase chain reaction (PCR) using specific PCR primers. To understand the variation in leaf-nutrient content in citrus plants, we used foliar nutrient values from control (non-symptomatic) plants as a reference. Chemometric analysis showed that the deficiency of P and K in symptomatic trees for all orchards and high concentrations of Fe, Mn and Zn were observed in chlorotic areas, although other studies revealed deficiency of zinc in leaves. This is the first report showing that a correlation between chlorotic citrus leaf and higher concentrations of Fe, Mn and Zn are observed when infected and healthy plants were compared. (AU)

FAPESP's process: 98/16265-1 - Functional analysis of Xylella genome by identification of proteins and putative virulence related low molecular weight compounds
Grantee:Tsai Siu Mui
Support type: Genome Research Grants