Genetic basis and mapping of the resistance to rice yellow mottle virus. I. QTLs identification and relationship between resistance and plant morphology

• Published in: Theoretical and applied genetics Vol. 97; no. 7; pp. 1145 - 1154
• Main Authors: ALBAR, L, LORIEUX, M, AHMADI, N, RIMBAULT, I, PINEL, A, SY, A. A, FARGETTE, D, GHESQUIERE, A
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.11.1998; Berlin Springer Nature B.V
• Subjects: Biological and medical sciences; Botany; Chromosomes; Classical genetics, quantitative genetics, hybrids; Diseases and pests; Fundamental and applied biological sciences. Psychology; Genetic aspects; Genetics of eukaryotes. Biological and molecular evolution; Health aspects; Morphology; Oryza sativa; Physiological aspects; Plant genetics; Plant immunology; Plant viruses; Pteridophyta, spermatophyta; Quantitative genetics; Rice; Rice yellow mottle virus; Vegetals; Virus diseases of plants; France; Genetic mapping; Monocotyledones; Rice yellow mottle virus; Plant pathogen; Quantitative character; Chromosome; Cereal crop; Virus; Oryza sativa; Microorganism resistance; Sobemovirus; Gramineae; Morphology; Angiospermae; Spermatophyta
• ISSN: 0040-5752; 1432-2242
• DOI: 10.1007/s001220051003

Rice yellow mottle virus (RYMV) resistance QTLs were mapped in a doubled-haploid population of rice, 'IR64/Azucena'. Disease impact on plant morphology and development, expression of symptoms and virus content were evaluated in field conditions. Virus content was also assessed in a growth chamber. RYMV resistance was found to be under a polygenic determinism, and 15 QTLs were detected on seven chromosomal fragments. For all of the resistance QTLs detected, the favourable allele was provided by the resistant parent 'Azucena'. Three regions were determined using different resistance parameters and in two environments. On chromosome 12, a QTL of resistance that had already been detected in this population and another indica/japonica population was confirmed both in the field and under controlled conditions. Significant correlations were observed between resistance and tillering ability, as measured on control non-inoculated plants. In addition, the three genomic fragments involved in resistance were also involved in plant architecture and development. In particular, the semi-dwarfing gene sd-1, on chromosome 1, provided by the susceptible parent, 'IR64', mapped in a region where resistance QTLs were detected with most of the resistance parameters. In contrast, the QTL of resistance mapped on chromosome 12 was found to be independent of plant morphology.