Ndjiondjop Marie-Noëlle, Albar Laurence, Fargette Denis, Fauquet Claude, Ghesquière Alain. (1999). The genetic basis of high resistance to rice yellow mottle virus (RYMV) in cultivars of two cultivated rice species. Plant Disease, 83 (10), p. 931-935. ISSN 0191-2917.
Titre du document
The genetic basis of high resistance to rice yellow mottle virus (RYMV) in cultivars of two cultivated rice species
Plant Disease, 1999,
83 (10), p. 931-935 ISSN 0191-2917
Three cultivars of Oryza sativa (IR64, Azucena, and Gigante) and four cultivars of O. glaberina (Tog5681, Tog5673, CG14, and SG329) were evaluated for their resistance to two isolates of rice yellow mottle virus (RYMV) by enzyme-linked immunosorbent assay (ELISA) and symptomatology. Cultivars Tog5681 and Gigante were highly resistant, and no symptoms were observed when either virus isolate was inoculated at 10 or 20 days postgermination and assayed by ELISA at 7, 14, 22, 35, 50, or 64 days postinoculation. Azucena showed a partial resistance, whereas the other cultivars were susceptible. Symptom appearance was associated with increase in ELISA absorbance in the systemically infected leaves. The best discrimination among the cultivars occurred when the plants were inoculated at 10 days postgermination. Crosses were made between the higly resistant (Gigante and Tog5681) and the susceptible (IR64) cultivars to determine the genetic basis of resistance to RMYV. Evaluation of F1 hybrids and interspecific progenies, as well as the segregation of resistance in F2 and F3 lines of the IR64 x Gigante cross, provided results consistent with the presence of a single recessive resistance gene common to Tog5681 and Gigante. (Résumé d'auteur)
Plan de classement
Recherche et évaluation des gènes de résistance [076MALPLA08]
