Sudden Death of Citrus in Brazil: A Graft-Transmissible Bud Union Disease

Plant Disease
M P RománJoseph M Bové

Abstract

Citrus Sudden Death (CSD), a new, graft-transmissible disease of sweet orange and mandarin trees grafted on Rangpur lime rootstock, was first seen in 1999 in Brazil, where it is present in the southern Triângulo Mineiro and northwestern São Paulo State. The disease is a serious threat to the citrus industry, as 85% of 200 million sweet orange trees in the State of São Paulo are grafted on Rangpur lime. After showing general decline symptoms, affected trees suddenly collapse and die, in a manner similar to trees grafted on sour orange rootstock when affected by tristeza decline caused by infection with Citrus tristeza virus (CTV). In tristeza-affected trees, the sour orange bark near the bud union undergoes profound anatomical changes. Light and electron microscopic studies showed very similar changes in the Rangpur lime bark below the bud union of CSD-affected trees: size reduction of phloem cells, collapse and necrosis of sieve tubes, overproduction and degradation of phloem, accumulation of nonfunctioning phloem (NFP), and invasion of the cortex by old NFP. In both diseases, the sweet orange bark near the bud union was also affected by necrosis of sieve tubes, and the phloem parenchyma contained characteristic "chromatic" cel...Continue Reading

References

Apr 20, 1995·Virology·A V KarasevR F Lee
Sep 1, 1996·The Journal of General Virology·M MawassiM Bar-Joseph
Mar 26, 1999·The Journal of General Virology·M C VivesP Moreno
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Nov 19, 1949·Nature·W A HUGHES, C A LISTER
Oct 24, 2008·Phytopathology·M E HilfS M Garnsey

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Citations

Jul 19, 2012·Applied Microbiology and Biotechnology·Olivier CouillerotYvan Moënne-Loccoz
Aug 19, 2008·Molecular Plant Pathology·Pedro MorenoLeandro Peña
Aug 1, 2021·Plant Physiology and Biochemistry : PPB·Wei DuShu-Ang Peng

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