African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6668

Full Length Research Paper

Sensitivity to gamma rays studies in two Iranian rice (Oryza sativa) genotypes

Hallajian Mohammad Taher1*, Muminjanov Hafiz2, Jamali Sepideh Sadat1, Vedadi Cirus1, Naghavi Mohammad Reza3 and Majdabadi Abbas1
  1Agricultural, Medical and Industrial Research School of Nuclear Science and Technology Research Institute, Karaj-Iran. 2Tajik Agrarian University, 146 Rudaki ave., Dushanbe 734017, Tajikistan. 3Agriculture Faculty of Tehran University, Iran.
Email: [email protected]

  •  Accepted: 15 June 2011
  •  Published: 19 October 2011

Abstract

 

Determination of effective irradiation dose is prerequisite for mutation breeding and development of genetic variations by induced mutation. In this study, two rice genotypes (cultivar Fajr and landrace Tarom mohalli) were used for effective dose determination and to compare their sensitivity to different doses of gamma rays in a completely random design. It was found that, irradiation reduced significantly adventure and survival percentages of seedlings in higher doses and this reduction was more pronounced in inbred cultivar. With attention to LD50 data, our results indicated that optimum doses for landrace Tarom mohalli and for cultivar Fajr were 220 and 200 Gy, respectively. Although LD50 was the same in both genotypes, but survival percentage of seedlings was more in landrace Tarom mohalli. We concluded that cultivars are more sensitive to gamma rays than landraces.

 

Key words: Induced mutation, gamma rays, primary damage, rice.