Document Type : Research Paper

Authors

• Allahyar Fallah ¹
• Leila Bagheri ²
• Alireza Nabipour ³
• ebrahim moghiseh ⁴
• Keyvan Mahdavi Mashaki ⁵

¹ Assistant Professor of the Rice research institute of Iran, Mazandaran Branch, Agricultural research, Education and Extension Organization (AREEO), Amol, Iran.

² Researcher of Radiation Application Research School, Nuclear Science and Technology Research Institute

³ Assistant Professor of the Rice Research Institute of Iran, Mazandaran Branch, Agricultural research, Education and Extension Organization (AREEO), Amol, Iran

⁴ عضو هیأت علمی پژوهشگاه

⁵ Assistant Professor of the Rice Research Institute of Iran, Mazandaran Branch, Agricultural research, Education and Extension Organization (AREEO)

Abstract

Mutation breeding has proved to be an efficient method for developing new cultivars adapted to normal and stress conditions including salinity. Mutant populations which were developed by gamma irradiation of Tarom Mahalli, Hassani and Anbarboo local rice verieties were evaluated and screened for 10 years in saline paddy fields of Mazandaran for agronomic traits, namely plant height, early-maturity, yield and yield components and relative tolerance to salinity stress. The salinity of soil and irrigation water in different years and places varied between 4-11 and 2-9 dS/m, respectively and the tolerance indices of the mutants were either 3 or 5. 13 mutants showed lower stress sensitivity indices than their respective parents. Most of the mutants required less days to reach 50% flowering than their parents. The number of days from sowing to 50% flowering in selected mutants (2310, 2212 and 133) was between 80 and 90 days. The average plant height among the selected mutants (M5-M7) in saline paddy fields of Mazandaranwas between 110-130 cm. All the selected mutants produced higher number of panicles per hill than Tarom Mahalli. The average yield of rice mutants in different locations and years varied between 3000 and 4500 kg/ha. Mutants 2212 and 2310 had the highest yields in Bahnamir and Fereydoonkenar, which showed at least 35% increase in yield compared to the Tarom Mahali. The amylose percentage of the mutants varied between 18-23. Based on the results, mutants 2212, 2310 and 133 were selected for paddy fields with saline or brackish water.

Keywords

• Amylose"؛
• "؛ Mutation"؛ Yield"؛
• "؛ Salinity"؛ "؛ Rice mutant yield"؛

Main Subjects

• APPLIED LIFE SCIENCES