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- Title
Mapping and marker-assisted breeding of a gene allelic to the major Asian rice gall midge resistance gene Gm8.
- Authors
Sama, V.; Himabindu, K.; Naik, S.; Sundaram, R.; Viraktamath, B.; Bentur, J.
- Abstract
Host plant resistance is the preferred management strategy for Asian rice gall midge ( Orseolia oryzae), a serious pest in many rice-growing countries. Identification of simple sequence repeat (SSR) markers that are tightly linked to pest resistance genes can accelerate development of gene pyramids for durable/multiple resistance. Based on conventional and molecular allelism tests, we report herein that rice genotype Aganni possesses Gm8 gene, conferring hypersensitive independent (HR- type) resistance to gall midge biotypes GMB1, GMB2, GMB3, GMB4, and GMB4M. The gene Gm8 was mapped to chromosome 8 within a 400-kbp region, and the SSR markers RM22685 and RM22709 flank the gene closely. Using these closely linked flanking markers, nine other gall midge-resistant genotypes were identified as carrying the same gene Gm8. Through marker-assisted selection, Gm8 has been introgressed into an elite bacterial blight-resistant cultivar, Improved Samba-Mahsuri (IS).
- Subjects
RICE gall midge; PLANT gene mapping; GENETIC markers in plants; HOST plants; GENE frequency; CULTIVARS; PLANT diseases; ALLELES
- Publication
Euphytica, 2012, Vol 187, Issue 3, p393
- ISSN
0014-2336
- Publication type
Article
- DOI
10.1007/s10681-012-0724-y