The effect of colchicine on meiosis in the Rhoeo discolor stabile complex translocation heterozygote
1992
Verma, R.C. | Vyas, P. | Raina, S.N.
Rhoeo discolor (2n = 12) was used to study the effect of colchicine on chromosome pairing during meiosis. Pachytene pairing appeared unaffected, but only 17.5% of the PMCs formed a ring of 12 chromosomes at metaphase I of meiosis. While 27.5% of cells had a complete chain of 12, 49.0% had chain configurations of varying (2-11) number of chromosomes and 6.0% had complete univalence. Adjacent orientation was found in the majority of cells with chain complexes of 2-11 chromosomes. The result was highly disturbed anaphase I where 58.4% PMCs were abnormal. It is concluded that the presence of aberrant cells at metaphase I is either due to colchicine-induced ineffectiveness of pairing at the very small pairing regions or failure of chiasma formation.
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