Meiotic Abnormalities Induced by X-rays in Arachis Hypogoea

Cytological investigations have been made on X₁ groundnut plants raised from seeds exposed to 25,000 r and 75,000 r of 250 kVp X-rays. The observations revealed that there occurred:

(i) a large number of reciprocal translocations leading to the formation of chain and ring multivalents

(ii) inversions leading to fragmentation and bridges at AI and AII and persistent AI bridges at TII, (iii) abnormal spindles, sometimes with irregular chromosomal separation, (iv) partial or complete failure of cytokinesis leading to the formation of bigger pollen grains and also fused or twin pollen grains.