Studies on the Effect of Gamma-Rays on the Chromosomal Behaviour during Meiosis in Barley (Hordeum Vulgare L.)
Tiwari Usha, Shukla R.S.
Cytogenetical Laboratory, Dept. of Botany, Dayanand Anglo Vedic College, Kanpur – 208 002, India.
Seeds of Barely variety Lakhan and K 1155 were treated with 25kR, 20kR and 40kR of gamma-rays. The mutation frequency increased gradually up to moderate dosages of gamma rays and the highest frequency rate was found in the variety K 1155 being huskless. Reduced chiasmata frequency per cell was observed with mutagens on barley of both the tested cultivars. Some of the plants in mutants population of 40kR dose of gamma-rays were found to be abnormal aberrations in chromosomal behaviour in metaphase I. In Anaphase I the chromosomal behaviour in both the cultivars were irregular, delayed separation, laggards etc. at higher dosages than that of lower dosages.