Department of Genetics, Punjab Agricultural University, Ludhiana-141 004, India
*Present address:—Department of Botany, School of Life Sciences, North-Eastern Hill University. Shillong—793 014, India.
Advanced autotetraploids (C7/C8 generations) of Trigonella foenum-graecum were studied. C7/C8 autotetraploids showed an improvement in seed-set and an increase in the frequency of bivalents. However, genotype was found to be more important for pollen and seed fertility. Unequal anaphase disjunction and malfunctioning of spindle have been found to produce aneuploid gametes. The frequency of quadrivalents and bivalents was found to be related with anaphase disjunction. Chiasma frequency in the autotetraploids was less than twice that of the diploids. The autotetraploids of all strains produced more seeds per plant in the advanced generations compared to C4 except those produced from M1 seedlings after X-irradiation.
