Two Field experiments were carried out at the Agricultural Experiments and Researches Station, Bahteem, 
A.R.C, Egypt, during the two growing seasons of 2013 and 2014 gamma rays affection for evaluating some mung 
bean genotypes. Seeds of four lines and two local varieties of mung bean. (Vigna radiata L. Wilczek) were subjected 
to three different doses of gamma irradiation (20, 40 and 60 Gy) to evaluate the effect on yield attributing characters. 
The experiment was arranged in a randomized complete block design with three replications. Results showed that 
mung bean lines were differed significantly in most of its traits. Fam.1 line scored the largest values for most studied 
traits as compared with other mung bean lines under the study during 2013 and 2014 seasons. 
Also results revealed that gamma irradiation significantly affected the most mentioned parameters. The 
greatest values for plant height (66.18 cm), number of branches (2.17), No. of pods/plot (1008.83), seed weight 
(684.19) was obtained from radiated seeds with D20 and D40 Gy, in 2013 season, while, in 2014 season the greatest 
value for that previous traits were (107.83 cm), (3.08), (1468.83) and (397.48) respectively, recorded from radiated 
seeds with D60 and D00. On the other hand, the lowest values for most traits were obtained from radiated seeds with 
20 Gy and no-radiated treatment.
Results indicated that the interaction effect between mung bean lines and gamma doses radiation significantly 
affected mung bean traits. Fam.1 line that radiated with D20 Gy and D40 Gy gave the significant greatest values for 
most traits in 2013 and 2014 seasons. While, the lowest values for most mung bean traits were recorded by growing 
seeds of Fam.5 line which radiated with D00, D20 and 40 Gy in both two of seasons.