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Mapping of QTLs involved in resistence to rice blast (Magnaporthe grisea) using Oryza minuta introgression lines

Author

Listed:
  • Lutfor Rahman

    (Department of Plant Science and Research, Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Korea)

  • Sakina Khanam

    (Department of Plant Science and Research, Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Korea
    Division of Crop Physiology, Bangladesh Institute of Nuclear Agriculture, Mymensingh, Bangladesh)

  • Jae-Hwan Roh

    (Rice Research Division, National Institute of Crop Science, Rural Development Administration, Suwon, Korea)

  • Hee-Jong Koh

    (Department of Plant Science and Research, Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Korea)

Abstract

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 (STS) and Single Sequence Repeat (SSR) markers, five QTLs on chromosomes 6, 7, 9 and 11 and seven epistatic QTLs were identified against two blast isolates (KI307 and KI209). Of them 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.

Suggested Citation

  • Lutfor Rahman & Sakina Khanam & Jae-Hwan Roh & Hee-Jong Koh, 2011. "Mapping of QTLs involved in resistence to rice blast (Magnaporthe grisea) using Oryza minuta introgression lines," Czech Journal of Genetics and Plant Breeding, Czech Academy of Agricultural Sciences, vol. 47(3), pages 85-94.
    • Handle: RePEc:caa:jnlcjg:v:47:y:2011:i:3:id:19-2011-cjgpb
    DOI: 10.17221/19/2011-CJGPB
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