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Blackgram (Vigna mungo (L.) Hepper) (2n=22) popularly known as urdbean, belongs to family Fabaceae. It is highly nutritious crop rich in seed protein content (24-28 per cent) and contributes 76 per cent carbohydrate, 3 to 5 per cent fibre, 1.74 per cent fat, vitamins like thiamine (B1), riboflavin (B2) and niacin (B3) and also rich in minerals like phosphorus, calcium, magnesium and potassium etc. (Elangaimannan et al., 2008). This crop has an important role in meeting the dietary protein requirement, in particular, in South India where its products are daily used in different forms like idli, dosa and vada etc. The perusal of the statistics of blackgram showed that India is the largest producer in The present investigation was taken up to study the sensitivity of two blackgram varieties viz., LBG 752 and TBG 104 to three mutagens on biological parameters and to determine the lethal dose (LD50) of mutagens. The seeds were treated with different doses/concentrations of gamma rays (200 Gy, 300 Gy, 400 Gy, 500 Gy and 600 Gy), EMS (Ethyl methane sulphonate) (0.2%, 0.3%, 0.4%, 0.5% and 0.6%) and MH (Maleic Hydrazide) (0.01%, 0.02% and 0.03%). MH treatment resulted in drastic reduction in seed germination percentage, shoot length and root length followed by EMS treatment and gamma rays treatment in both the varieties. The reduction in these characters with increasing dose/concentration of mutagens was more prominent in LBG 752 than TBG 104 indicating more sensitive response of LBG 752 to mutagen treatment than TBG 104. LD50 values were estimated based on seed germination percentage and the values were 500.16 Gy for gamma rays, 0.396% for EMS and 0.016% for MH in LBG 752 and 552.92 Gy for gamma rays, 0.554% for EMS and 0.028% for MH in TBG 104. These findings would greatly help for cost effective selection of variety and mutagens for successful generation of variation in mutation breeding programmes aimed at blackgram crop improvement. K e y w o r d s

Studies on Sensitivity of Blackgram (Vigna mungo (L.) Hepper) Varieties to Physical and Chemical Mutagens under in-vitro Condition