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Titre du document / Document title

Association of Candidatus Phytoplasma australiense with sudden decline of cabbage tree in New Zealand

Auteur(s) / Author(s)

ANDERSEN Mark T. (1) ; BEEVER Ross E. (2) ; SUTHERLAND Paul W. (1) ; FORSTER Richard L. S. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Landcare Research, Private Bag 92170, Auckland, NOUVELLE-ZELANDE
(2) The Horticulture and Food Research Institute of New Zealand Ltd., Private Bag 92169, Auckland, NOUVELLE-ZELANDE

Résumé / Abstract

Sudden decline of the New Zealand cabbage tree (Cordyline australis) results in the rapid death of affected plants within months of first external symptoms becoming apparent. Symptoms, which have been observed in saplings and mature trees, include vascular discoloration and leaf yellowing followed by leaf desiccation and eventual plant collapse. Previous work failed to link the disease with any causal agent. A phytoplasma has now been detected in all symptomatic saplings and some symptomatic trees tested, using one-step and nested polymerase chain reaction (PCR) to amplify portions of the 16S rRNA gene. This phytoplasma was not detected in nonsymptomatic plants. Phytoplasma DNA was found in shoot and rhizome apices, leaves and wood tissue of saplings, and in the rhizome apex and trunk tissues of adult trees. Sequencing of the PCR products from selected samples indicated that the phytoplasma is Candidatus Phytoplasma australiense. Phytoplasma cells were detected by transmission electron microscopy in phloem sieve tubes of the rhizomes of affected saplings. One sapling with early symptoms recovered after injection with tetracycline antibiotic, but two saplings with advanced symptoms did not recover. It is concluded that Candidatus Phytoplasma australiense is present in symptomatic plants and is the cause of sudden decline.

Revue / Journal Title

Plant disease    ISSN  0191-2917   CODEN PLDIDE 

Source / Source

2001, vol. 85, no5, pp. 462-469 (29 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Phytopathological Society, St. Paul, MN, ETATS-UNIS  (1980) (Revue)

Mots-clés anglais / English Keywords

Phytoplasma

;

Epidemiology

;

Symptomatology

;

Electron microscopy

;

Ultrastructure

;

Detection

;

Polymerase chain reaction

;

Ribosomal DNA

;

16S-RNA

;

New Zealand

;

Mollicutes

;

Bacteria

;

Plant pathogen

;

Agavaceae

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

Oceania

;

Mots-clés français / French Keywords

Phytoplasme

;

Epidémiologie

;

Symptomatologie

;

Microscopie électronique

;

Ultrastructure

;

Détection

;

Réaction chaîne polymérase

;

DNA ribosomique

;

RNA 16S

;

Nouvelle Zélande

;

Phytoplasma australiense

;

Cordyline australis

;

Mollicutes

;

Bactérie

;

Phytopathogène

;

Agavaceae

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

Océanie

;

Mots-clés espagnols / Spanish Keywords

Fitoplasma

;

Epidemiología

;

Sintomatología

;

Microscopía electrónica

;

Ultraestructura

;

Detección

;

Reacción cadena polimerasa

;

DNA ribosómico

;

ARN 16S

;

Nueva Zelandia

;

Mollicutes

;

Bacteria

;

Fitopatógeno

;

Agavaceae

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

Oceania

;

Localisation / Location

INIST-CNRS, Cote INIST : 12673, 35400009818478.0020

Nº notice refdoc (ud4) : 1046621



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