Ioannidou D., Lett J.M., Pinel A., Assigbetsé Komi, Brugidou Christophe, Ghesquière Alain, Nicole Michel, Fargette Denis. (2000). Responses of Oryza sativa japonica sub-species to infection with Rice yellow mottle virus. Physiological and Molecular Plant Pathology, 57 (4), p. 177-188. ISSN 0885-5765.
Titre du document
Responses of Oryza sativa japonica sub-species to infection with Rice yellow mottle virus
Année de publication
2000
Auteurs
Ioannidou D., Lett J.M., Pinel A., Assigbetsé Komi, Brugidou Christophe, Ghesquière Alain, Nicole Michel, Fargette Denis
Source
Physiological and Molecular Plant Pathology, 2000,
57 (4), p. 177-188 ISSN 0885-5765
The distribution of Rice yellow mottle virus (RYMV) was compared in the partially resistant upland rice Oryza sativa japonica cv. Azucena and in the susceptible O. sativa indica cv IR64, which are the two parents of a doubled haploid population studied for several traits, including genetic determinants of resistance to RYMV infection. Sympton expression distribution and accumulation of viral coat protein and nucleic acid were studied in inoculated leaves, systemically infected leaves and apices, and in leaf host tissues. Initially, the resistance was apparent as delayed virus detection and multiplication which led to a lower virus content in inoculated leaves and in systemically infected organs. Later, the resistance was less apparent as virus titers became progressively similar in the two cultivars. Then tolerance was observed, as symptom expression was less pronounced in cv. Azucena than in IR64, despite similar virus contents. In host tissues, partial resistance was associated with the delayed detection of virus in the bundle sheaths (mestomes) of Azucena, and, later, the mestome invasion paralleled the decline in resistance. The mature leaves of both cultivars always escaped infection. Partial virus resistance resulted from the expression of quantitative trait locus on chromosome 12, whereas tolerance is a characterisitc of O. japonica, including the expression of QTL1. An imparied cell to cell movement through the mestome, possibly reinforced by slow vascular movement, are proposed to explain the partial resistance. (Résumé d'auteur)
Plan de classement
Maladies des plantes [076MALPLA]
Descripteurs
RIZ ; MALADIE DES PLANTES ; PATHOLOGIE VEGETALE ; PHYTOVIRUS ; RESISTANCE DE L'HOTE ; SENSIBILITE RESISTANCE ; TOLERANCE ; METHODE D'ANALYSE ; ETUDE EXPERIMENTALE ; QTL.QUANTITATIVE TRAIT LOCUS ; RESISTANCE PARTIELLE ; ANALYSE GENETIQUE ; TEST ELISA ; TECHNIQUE PCR
Description Géographique
BURKINA FASO ; COTE D'IVOIRE
Localisation
Fonds IRD [F B010023701] ;
Montpellier (Centre IRD)
Identifiant IRD
fdi:010023701
