Radiation Induced Cytomorphological Changes in Hyoscyamus muticus L

抄録

Five distinct mutants differing for their phenotypic appearance and floral characters were identified in M₂ generation of gamma ray irradiated (20 kR (200 Sv), 40 kR (400 Sv)) seed progeny of Hyoscyamus muticus (2n=28). They were subjected to meiotic analysis to understand their genotypic sensitivity to induced cytological changes. Genotype P₇ was observed to be more susceptible to undergo chromsome mutations compared to genotype P₉. The induced variation drastically affected the plant vigour and caused variation in the incision of corolla and number of petals. This was coupled with disturbance in meiotic behaviour, which included chromosome stickiness, desynapsis, anaphase nondisjunction, multiplolarity, simple and multiple interchanges. Pollen and seed fertility was moderately affected by spindle related disturbance but severely affected by chromosome interchanges.