S. D. J. Post Graduate College, Chandesar, Azamgarh-276 128, U. P.
Two homozygous translocation lines induced through gamma rays in barley cultivar Jyoti were crossed with normal plants and F1 showed ring of 4 configurations at MI. Intercrosses between the two translocations showed ring or chain of 6 chromosomes indicating that one chromosome was common to both. Attachement of the multivalent with nucleolus led to the conclusion that nucleolar chromosome was involved in the translocation. Alternate orientation in ring of 4 was more than 70% whereas in 6 or ch. 6, it was 58-2%. Pollensrerility in the plant carrying hexavaient was higher than that the plants carrying quadrivalent. Translocation trisomies were isolated from the progeny of heterozygous translocations. At M I, the extra chromosome showed various types of association. Based on Tsuchiya's classification, the trisomies were identified as slender (for chromosome 2) and purple (for chromosome 6) according to their morphology.
