IDENTIFICATION OF SEMI-DWARF AND HIGH YIELDING MUTANTS IN DUBRAJ RICE VARIETY OF CHHATTISGARH THROUGH GAMMA RAY BASED INDUCED MUTAGENESIS

DEEPAK SHARMA¹, B.K. DAS², VIKASH KUMAR³, ASHISH TIWARI⁴, PARMESHWAR K. SAHU⁵*, SATYAPAL SINGH⁶, SAMRATH BAGHEL^7
1Department of Genetics and Plant Breeding, Indira Gandhi Krishi Vishwavidyalaya, Raipur, 492012, Chhattisgarh
²Mutation Breeding Section, Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Mumbai, 400085
³Mutation Breeding Section, Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Mumbai, 400085
⁴Department of Genetics and Plant Breeding, Indira Gandhi Krishi Vishwavidyalaya, Raipur, 492012, Chhattisgarh
⁵Department of Genetics and Plant Breeding, Indira Gandhi Krishi Vishwavidyalaya, Raipur, 492012, Chhattisgarh
⁶Department of Genetics and Plant Breeding, Indira Gandhi Krishi Vishwavidyalaya, Raipur, 492012, Chhattisgarh
⁷Department of Genetics and Plant Breeding, Indira Gandhi Krishi Vishwavidyalaya, Raipur, 492012, Chhattisgarh
* Corresponding Author : parmeshwarsahu1210@gmail.com

Received : 31-08-2017     Accepted : 03-09-2017     Published : 28-09-2017
Volume : 9     Issue : 9       Pages : 298 - 303
Genetics 9.9 (2017):298-303

Keywords : Dubraj, induced mutation, gamma rays, traditional aromatic rice, semi-dwarf
Conflict of Interest : None declared
Acknowledgements/Funding : Bhabha Atomic Research Centre (BARC), Mumbai and Board of Research in Nuclear Sciences (BRNS), Department of Atomic Energy (DAE), Government of Indi
Author Contribution : All author equally contributed

Ideal plant architecture is the basis of super high-yielding rice. Plant height is one of the most important agronomic traits for producing high yields. Excessive plant height results in lodging and reduced yield. Dubraj, a local cultivar of rice, is also known as “miracle rice variety” due to its aromatic, medium slender(fine) grain with extra ordinary premium grain quality and excellent taste. But it is very tall and very late in maturity. Due to its tall stature, the variety is prone to lodging causing severe yield penalty. Physical mutagen (viz., Gamma rays) has been used in the past to generate vast functional variability for different traits in cereals specially rice crop. In the present investigation, gamma ray induced mutagenesis have been used successfully to develop Dubraj mutants with reduced plant height, increased tiller number, earlier in maturity and higher grain yield. Seeds were irradiated with 300Gy Gamma ray dose and M1 generation was planted. Ample amount of variability presents the mutants for all the morphological and yield attributing traits. Total 18 economically useful mutants were selected in M2 generation for further advancement and stabilization. These mutants were of different tyeps viz., semi-dwarf with mid late maturity mutants, increased tillering ability with high grain yielding mutants, bushy and broad leaf mutants, grassy leaf mutant and sterile type mutant. Due to induced mutation, plant height of mutants was reduced upto 10.9% to 47% whereas days to maturity were reduced upto 4% to 14% as compare to their parent. Percent increase in tillering ability of mutants is ranged from 18% to 88% whereas total of 3% to 49.9% yield increment was seen in mutants. Identification and stabilization of few semi-dwarf mutants coupled with other yield component traits viz. effective tillers/plant, number of fertile spikelets/panicle, tolerance to disease and responsiveness to fertilizer has assumed great significance in improving traditional aromatic rice cultivar Dubraj. Three most desirable mutatnts viz., mutant-13, mutant-14 and mutant-453 were identified for release as commercial cultivar. These mutants were further advanced for stabilization and multiplication.

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