Inheritance and allelic relationships of rice gall midge resistance genes in some new donors
2003
Kumar, A. | Shrivastava, M.N. | Sahu, R.K. | Shukla, B.C. | Shrivastava, S.K.
The Asian rice gall midge, Orseolia oryzae Wood Mason (Diptera: Cecidomyiidae), is a major pest of rice in several South and Southeast Asian countries. The maggots feed internally on the growing tips of the tillers and transform them into tubular, onion-like structures called "silvershoots", resulting in severe yield loss to the rice crop. We studied the mode of inheritance and allelic relationships of resistance against gall midge in four resistant donors - Abhaya, ARC 5984, RP2068-18-3-5, and RP2333-156-8. The segregation behavior of F1, F2, and F3 confirmed the presence of a single dominant gene for resistance im Abhaya, ARC 5984, and RP2333-156-8 and a single recessive gene for resistance in RP2068-18-3-5. Allelic relationship studies with known genes for resistance (Gm1, Gm2) and among themselves confirmed the presence of nonallelic genes for resistance in Abhaya, ARC 5984, RP2068-18-3-5, and RP2333-156-8. The recessive gall midge resistance gene present in donor RP2068-18-3-5 could be designated as gm3. The dominant genes for gall midge resistance present in donors Abhaya, ARC 5984, and RP2333-156-8 can be designated as Gm4, Gm5, and Gm7, respectively.
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