Histology of Sweet Orange Stem Pitting Caused by an Australian Isolate of Citrus tristeza virus

Some strains of the Citrus tristeza virus (CTV) cause stem pitting in sweet orange (Citrus sinensis (L.) Osbeck). This abnormality causes tree decline and reduction in fruit size and yield of affected citrus trees. Stem-pitting symptoms can occur on trunks, on all sizes of limbs, and on the twigs wh...

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Veröffentlicht in:Plant disease. - 1997. - 86(2002), 10 vom: 01. Okt., Seite 1169-1174
1. Verfasser: Brlansky, R H (VerfasserIn)
Weitere Verfasser: Howd, D S, Broadbent, P, Damsteegt, V D
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2002
Zugriff auf das übergeordnete Werk:Plant disease
Schlagworte:Journal Article
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520 |a Some strains of the Citrus tristeza virus (CTV) cause stem pitting in sweet orange (Citrus sinensis (L.) Osbeck). This abnormality causes tree decline and reduction in fruit size and yield of affected citrus trees. Stem-pitting symptoms can occur on trunks, on all sizes of limbs, and on the twigs where fruit are produced. Variously sized pits or grooves in the wood often contain a yellow gum. Irregular growth of the phloem occurs in the area of these xylem pits. The histology of stem pitting caused by an Australian CTV isolate was studied in sweet orange using light and electron microscopy. Using scanning electron microscopy, details of the wood pits containing the gumming material were revealed. In thin sections of bark tissue, outgrowths of the phloem tissue were found at various intervals that corresponded to the pits in the wood. Higher numbers of viral inclusions were detected in the phloem outgrowths than were present in the other sieve elements 
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700 1 |a Broadbent, P  |e verfasserin  |4 aut 
700 1 |a Damsteegt, V D  |e verfasserin  |4 aut 
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