Abstract
Dry, well filled seeds of rice varieties T(N)1, IR 8 and Sona were treated with chemical mutagens: methyl methane sulphonate (MMS), dimethyl sulphate (DMS), dichloroethyl methane suiphonate (DEMS) and diethyl sulphate (dES) with a view to study their effects in inducing chromosomal aberrations. DEMS showed highest aberration rate (29.6%) followed by DMS (27.7%), dES (17.7%) and MMS (7.5%). The frequency of aberrations induced in Sona was relatively more (24.5%) compared to T (N) 1 (23.1%) and IR 8 (6.3%).The most common type of abnormality noticed in the meiotic cells involved the nucleolus. Other abnormalities induced include cryptic alterations in the pachytene chromosomes, delayed separation and bridges and fragments at anaphase I and higher incidence of rod bivalents and univalents.
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