Mapping of QTLs involved in resistance to rice blast (Magnaporthe grisea) using Oryza minuta introgression lines
2011
Rahman, L.,Seoul National Univ. (Korea Republic). Dept. of Plant Science and Research | Khanam, S.,Seoul National Univ. (Korea Republic). Dept. of Plant Science and Research | Roh, J.-H.,Rural Development Administration, Suwon (Korea Republic). Rice Research Div. | Koh, H.-J.,Seoul National Univ. (Korea Republic). Dept. of Plant Science and Research
Introgression lines derived from Oryza minuta and O. sativa subsp. japonica var. Junambyeo were crossed for a mapping of the population composed of 112 recombinant lines to identify putative QTLs against rice blast disease using the percentage of diseased leaf area. By using 148 Sequence Tagged Site and Single Sequence Repeat markers, five QTLs on chromosomes 6, 7, 9 and 11 and seven epistatic QTLs were identified against two blast isolates (KI307 and KI209). Two QTLs, qKI307-2 and qKI209-3, shared a similar position on chromosome 11. O. minuta introgression contributed the resistance allele for all of these QTLs. Combined phenotypic variations by QTL and (E-QTL) accounted for 56.9% against KI307, and 53.4% against KI209. Each QTL could account for the resistance variation between 11 and 24.6%. The resistance from wild introgressions was attributable to a combination of QTLs and epistatic effects between different loci, capable of inducing hypersensitive reactions. Our findings are in support of the strategy of pyramiding major QTLs to develop improved rice varieties with durable broad spectrum resistance against the blast fungus.
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