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Tagging and mapping of a rice gall midge resistance gene, Gm8, and development of SCARs for use in marker-aided selection and gene pyramiding

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Using amplified fragment length polymorphisms (AFLPs) and random amplified polymorphic DNAs (RAPDs), we have tagged and mapped Gm8, a gene conferring resistance to the rice gall midge (Orseolia oryzae), a major insect pest of rice, onto rice chromosome 8. Using AFLPs, two fragments, AR257 and AS168, were identified that were linked to the resistant and susceptible phenotypes, respectively. Another resistant phenotype-specific marker, AP19587, was also identified using RAPDs. SCAR primers based on the sequence of the fragments AR257 and AS168 failed to reveal polymorphism between the resistant and the susceptible parents. However, PCR using primers based on the regions flanking AR257 revealed polymorphism that was phenotype-specific. In contrast, PCR carried out using primers flanking the susceptible phenotype-associated fragment AS168 produced a monomorphic fragment. Restriction digestion of these monomorphic fragments revealed polymorphism between the susceptible and resistant parents. Nucleotide BLAST searches revealed that the three fragments show strong homology to rice PAC and BAC clones that formed a contig representing the short arm of chromosome 8. PCR amplification using the above-mentioned primers on a larger population, derived from a cross between two indica rice varieties, Jhitpiti (resistant parent) and TN1 (susceptible parent), showed that there is a tight linkage between the markers and the Gm8 locus. These markers, therefore, have potential for use in marker-aided selection and pyramiding of Gm8 along with other previously tagged gall midge resistance genes [Gm2, Gm4(t), and Gm7].

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This research was supported in part from a grant from the Rockefeller Foundation, USA, and a grant (CGP 320) from the Indian Council of Agricultural Research (ICAR), Government of India.

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Correspondence to S. Nair.

Additional information

The nucleotide sequence data reported here will appear in the EMBL, GenBank and DDBJ nucleotide sequence databases under the accession numbers AY545920–AY545923

Communicated by J.W. Snape

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Jain, A., Ariyadasa, R., Kumar, A. et al. Tagging and mapping of a rice gall midge resistance gene, Gm8, and development of SCARs for use in marker-aided selection and gene pyramiding. Theor Appl Genet 109, 1377–1384 (2004). https://doi.org/10.1007/s00122-004-1774-x

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  • Amplify Fragment Length Polymorphism
  • Scar Marker
  • Gall Midge
  • Amplify Fragment Length Polymorphism
  • RAPD Fragment