Biology and Agriculture Division, Bhabha Atomic Research Centre, Bombay-400085
Online published on 25 January, 2012.
Seven trisomies were isolated in Corchorus olitorius cv. JRO 632 after neutron and gamma ray treatments. Five of these were found to be primary trisomies. The extra chromosome in four primary trisomies were identified as chromosome 2, 4, 6 and 7. One of the trisomies was secondary for chromosome 5 exhibiting inter-arm pairing; and another was tertiary for chromosome 2. Pollen sterility in trisomies was high ranging from 30–60%. The segregation ratio of normal to trisomies varied from 4: 1 to 14: 1. Of the seven trisomies, six were obtained with neutrons.
