Nutritional deficiency in citrus with symptoms of citrus variegated chlorosis disease

Brazilian Journal of Biology

Me. Silva-stenico²  Fth. Pacheco²  Er. Pereira-filho¹  Jlm. Rodrigues¹  An. Souza²  A. Etchegaray¹  Je. Gomes²  Sm. Tsai² 

[1] ,Universidade de São Paulo Centro de Energia Nuclear na Agricultura Laboratório de Biologia Celular e MolecularPiracicaba SP ,Brazil

关键词: citrus;    nutrition;    Xylella fastidiosa;    CVC disease;    chemometry;    citros;    nutrição;    Xylella fastidiosa;    doença do CVC;    quimiometria;   

DOI  :  10.1590/S1519-69842009000400013

来源: SciELO

【 摘 要 】

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 São Paulo, Brazil, were respectively collected from Santa Rita do Passa Quatro, Neves Paulista, Gavião Peixoto and Paraíso 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.

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