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Titre du document / Document title

A cryptic intracellular green alga in Ginkgo biloba : ribosomal DNA markers reveal worldwide distribution

Auteur(s) / Author(s)

TREMOUILLAUX-GUILLER Jocelyne (1) ; HUSS Volker A. R. (2) ;

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

(1) Département de Biologie Moléculaire et de Biochimie Végétale, UPRES-2106, Université F. Rabelais, Faculté des Sciences Pharmaceutiques, 31 Av. Monge, 37200 Tours, FRANCE
(2) Lehrstuhl für Molekulare Pflanzenphysiologie, Friedrich -Alexander -Universitàt Erlangen -Nümberg, Staudtstr. 5, 91058 Erlangen, ALLEMAGNE

Résumé / Abstract

Intracellular symbioses involving eukaryotic microalgae and a variety of heterotrophic protists and invertebrates are widespread, but are unknown in higher plants. Recently, we reported the isolation and molecular identification of a Coccomyxa-like green alga from in vitro cell cultures of Ginkgo biloba L. This alga resides intracellularly in an immature "precursor" form with a nonfunctional chloroplast, implying that algal photosynthetic activity has no role in this endosymbiosis. In necrotizing Ginkgo cells, precursors evolved into mature algae, proliferated, and were liberated into the culture medium after host cell bursting. In the present paper we demonstrate by molecular methods a worldwide distribution of the alga in planta. Endosymbiont-specific sequences of ribosomal DNA could be traced in Ginkgo tissues of each specimen examined from different geographic locations in Europe, North America, and Asia. The Ginkgo/Coccomyca association represents a new kind of intracellular, vertically inherited symbiosis. Storage bodies, probably of lipid nature, present in the cytoplasm of each partner suggest a possible involvement of the endo-symbiont in metabolic pathways of its host.

Revue / Journal Title

Planta    ISSN  0032-0935   CODEN PLANAB 

Source / Source

2007, vol. 226, no2, pp. 553-557 [5 page(s) (article)] (1/2 p.)

Langue / Language

Anglais

Editeur / Publisher

Springer, Heidelberg, ALLEMAGNE  (1925) (Revue)

Mots-clés anglais / English Keywords

Spermatophyta

;

Gymnospermae

;

Ginkgoales

;

Thallophyta

;

Ginkgo biloba

;

Algae

;

Ribosomal DNA

;

Mots-clés français / French Keywords

Spermatophyta

;

Gymnospermae

;

Ginkgoales

;

Thallophyta

;

Ginkgo biloba

;

Algae

;

DNA ribosomique

;

Mots-clés espagnols / Spanish Keywords

Spermatophyta

;

Gymnospermae

;

Ginkgoales

;

Thallophyta

;

Ginkgo biloba

;

Algae

;

DNA ribosómico

;

Mots-clés d'auteur / Author Keywords

Coccomyxa, Endosymbiosis

;

Ginkgo

;

Ribosomal DNA

;

Localisation / Location

INIST-CNRS, Cote INIST : 916, 35400014994769.0230

Nº notice refdoc (ud4) : 18849446



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