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ORYZA- An International Journal on Rice
Year : 2013, Volume : 50, Issue : 1
First page : ( 18) Last page : ( 25)
Print ISSN : 0474-7615. Online ISSN : 2249-5266.

Phenotypic characterization and genetic analysis of dwarf and early flowering mutants of rice variety Nagina22

Kulkarni KP1,2,*, Vishwakarma C1, Sahoo SP1, Lima JM1, Nath M1, Dokku P1, Gacche RN2, Mohapatra T1,3, Robin S4, Sarla N5, Seshashayee M6, Singh AK7, Singh K8, Singh NK1, Sharma RP1

1National Research Centre on Plant Biotechnology, LBS Building, Pusa Campus, New Delhi

2School of Life Sciences, S. R. T. M. University, Nanded, Maharashtra

3Central Rice Research Institute, Cuttack, Odisha

4Tamilnadu Agricultural University, Coimbatore

5Directorate of Rice Research, Hyderabad

6University Agricultural Sciences, Bangalore

7Indian Agricultural Research Institute, New Delhi

8Punjab Agricultural University, Ludhiana, India

*Email: kulkarnikp@gmail.com

Online published on 22 August, 2013.


Plant height and flowering time are two of the important traits that affect plant architecture. Efforts were made in this study to characterize morphologically the-EMS-induced dwarf and early flowering mutants of rice variety Nagina22 and to study their mode of inheritance. Nine true breeding mutants generated earlier by EMS treatment were analysed for differences in their phenotypic characteristics recorded according to the national guidelines for Distinctness, Uniformity and Stability (DUS). The mutants exhibited variation from Nagina22 for maximum of 11 DUS characteristics to a minimum of 4 DUS descriptors, while retaining majority of the wild type features. Plant height of the dwarf mutants ranged from 69 to 101cm, while tiller number was in the range of 9 to 60. The early flowering mutants were weak in their plant stature, but flowered approximately 20–25 days earlier than Nagina22. Significant correlation among various traits of the selected mutants was observed. The mutant traits exhibited monogenic inheritance giving 3:1 phenotypic segregation ratio in F2 generation. These mutants have potential usage in functional analysis of the traits and in rice improvement programs.



rice variety Nagina22, DUS, dwarf mutant, early flowering, inheritance.


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