EL-Refaee, Y., Hadifa, A., EL-Shafey, R. (2017). Induction of Genetic Variability for some Agronomic Traits and Blast Disease Resistance in Egyptian Rice Variety Sakha101. Journal of Plant Production, 8(12), 1373-1381. doi: 10.21608/jpp.2017.42011
Y. Z. EL-Refaee; A. A. Hadifa; R. A. S. EL-Shafey. "Induction of Genetic Variability for some Agronomic Traits and Blast Disease Resistance in Egyptian Rice Variety Sakha101". Journal of Plant Production, 8, 12, 2017, 1373-1381. doi: 10.21608/jpp.2017.42011
EL-Refaee, Y., Hadifa, A., EL-Shafey, R. (2017). 'Induction of Genetic Variability for some Agronomic Traits and Blast Disease Resistance in Egyptian Rice Variety Sakha101', Journal of Plant Production, 8(12), pp. 1373-1381. doi: 10.21608/jpp.2017.42011
EL-Refaee, Y., Hadifa, A., EL-Shafey, R. Induction of Genetic Variability for some Agronomic Traits and Blast Disease Resistance in Egyptian Rice Variety Sakha101. Journal of Plant Production, 2017; 8(12): 1373-1381. doi: 10.21608/jpp.2017.42011
Induction of Genetic Variability for some Agronomic Traits and Blast Disease Resistance in Egyptian Rice Variety Sakha101
Rice Res. Dep., Field Crops Res. Inst., Agric. Res. Center, Egypt.
Abstract
The present study was undertaken to assess the differential sensitivity of Egyptian rice variety Sakha101 to gamma radiation, to study the genetic variability induced and to get desirable phenotypic mutants especially of economic importance traits and blast disease resistance. The study was conducted at the Experimental Farm of Sakha Agricultural Research Station, Kafr El-Sheikh, Egypt, during 2016 and 2017 rice growing seasons. Four gamma ray doses; 100, 200, 300 and 400 Gy were used to treat the seeds of the Egyptian rice variety Sakha 101. The results illustrated that heading date was early in all doses applied in M1-generation, except in 400 Gy. Plant height was decreased by increasing gamma irradiation in both M1 and M2-generations. Number of panicles/plant were decreased by using the dose of gamma rays for 100 and 200Gy, while it increased for 300 and 400 Gy treatments in both of M1 and M2 generations. The doses of gamma rays increased the means of sterility % and 100-grain weight in both of M1 and M2-generations. For grain yield/plant, the mean values decreased by increasing the dose of gamma rays up to 300 Gy while, increased at 400 Gy, where the grain yield per plant increased by 47.7 grams as compared with the control (44.0 grams) in M2-generation plants. All studied genetic parameters viz, genotypic variance (GV), genetic coefficient of variation (GCV), heritability in broad sense (h2bs) and genetic advance of mean (GS%) increased by increasing the dose of gamma rays in M2-generation indicating individual plant selection for these characters should be effective and satisfactory for successful breeding purposes. A total of 101 M2 mutant plants were found to be earlier in heading by 10-20 days than the mean value of the original variety Sakha 101; and 105 mutant plants were having grain yield/ plant more than 42 grams comparing with its original plants. About 591 plants from different irradiated treatments were found to be resistant to blast disease from M2-generation plants. Hence, the induced genetic variability is consider important as it is a basic requisite for successful rice breeding program via direct selection or by crossing with the commercial cultivated varieties.
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