Agronomic characteristic, genetic variability and heritability of mutant samosir shallot M1V2 generation irradiated by gamma rays

Hasanuddin Hasanuddin, Mariati Sinuraya, Diana Sofia Hanafiah, Rosmayati Rosmayati

Abstract: Induced mutagenesis by gamma rays irradiation is an established method especially for plant improvement of vegetatively propagated plants like shallot. In this research, nine mutant populations namely 1 Gy, 2 Gy, 3 Gy, 4 Gy, 5 Gy, 6 Gy, 7 Gy, 8 Gy and 9 Gy were planted along with O Gy (control plants) to evaluate agronomic characteristic, genetic coefficient variation and heritability estimates value of mutant samosir shallot genotype M1V2 generation, irradiated by gamma rays. Results showed that almost all mean values of agronomic characters observed on irradiated shallot in M1V2 generation were lower than those of control plant. Low doses of gamma rays irradiation increase genetic variation with high heritability estimate values on several characters of samosir shallot. Wide genotypic coefficient of variation (GCV) and high heritability values were obtained in the plant length character on 4 Gy and 9 Gy populations, tiller number on 1 Gy population, leaves number on 1 Gy to 4 Gy and 8 Gy populations, bulb fresh weight on 1 Gy to 3 Gy populations, and dry weight on 1 Gy to 4 Gy populations.

Keywords: agronomic characteristic; gamma rays; genetic heritability; genetic variability; irradiation; M1V2; shallot mutant

Date published: 2019-12-06