Effectiveness and Efficiency of Gamma Rays in some Inbreds of Sunflower (Helianthus annuus L.)

Mutagenic effectiveness and efficiency of gamma rays were studied in the four inbreds of sunflower. Gamma rays produced high frequency as well as a wide spectrum in mutation. The frequency of mutation was high at higher dose of mutagen. The mutagenic effectiveness and efficiency was calculated based on biological damage. In M1 generation based on seed lethality and pollen sterility and M2 generation was carefully screened for various chlorophyll and viable mutation. Mutagenic effectiveness and efficiency reduced with the increase in dose or concentration. In present investigation higher dose of 20kR was very effective and efficient in induction of mutation in all the genotypes studied except CMS- 104B where 15 kR dose was effective and efficient.