RFLP and RAPD mapping of the rice gm2 gene that confers resistance to biotype 1 of gall midge (Orseolia oryzae) |
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Authors: | M. Mohan S. Nair J. S. Bentur U. P. Rao J. Bennett |
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Affiliation: | (1) International Centre for Genetic Engineering and Biotechnology, NII Campus, 110 067 New Delhi, India;(2) Directorate of Rice Research, Rajendranagar, 500 030 Hyderabad, India;(3) Present address: Division of Plant Breeding, Genetics and Biochemistry, International Rice Research Institute, PO Box 933, 1099 Manila, Philippines |
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Abstract: | Gm2 is dominant gene conferring resistance to biotype 1 of gall midge (Orseolia oryzae Wood-Mason), the major dipteran pest of rice. The gene was mapped by restriction fragment length polymorphism (RFLP) analysis of a set of 40 recombinant inbred lines derived from a cross between the resistant variety Phalguna and the susceptible landrace ARC 6650. The gene is located on chromosome 4 at a position 1.3 cM from marker RG329 and 3.4 cM from RG476. Since the low (28%) polymorphism of this indica x indica cross hindered full coverage of the genome with RFLP markers, the mapping was checked by random amplified polymorphic DNA (RAPD)/bulked segregant analysis. Through the use of 160 RAPD primers, the number of polymorphic markers was increased from 43 to 231. Two RAPD primers amplified loci that co-segregated with resistance/susceptibility. RFLP mapping of these loci showed that they are located 0.7 cM and 2.0 cM from RG476, confirming the location of Gm2 in this region of chromosome 4. Use of these DNA markers will accelerate breeding for gall midge resistance by permitting selection of the Gm2 gene independently of the availability of the insect. |
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Keywords: | Oryza sativa Orseolia oryzae Gallmidge Diptera Bulked segregant analysis Recombinant inbred lines Insect resistance |
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