Studies on the Colchiploids of Four Species of Trigonella

抄録

Polyploidy has been induced in four species of Trigonella viz. T. corniculata, T. hamosa, T. coerulea and T. cretica, all having 2n=16 by treating the seedlings with 0.2% aqueous solution of colchicine. Tetraploids of T. hamosa, T. coerulea and T. cretica exhibited morphological gigantism while tetraploid T. corniculata and mixoploid T. hamosa had smaller vegetative parts than the diploids. Frequency of multivalent formation has not been found to be related with chromosome length. Chromosome pairing and multivalent association seem to be under genetic control. Anaphase I irregularities increase with the increase of trivalents and univalents at metaphase I and pollen fertility has no correlation with the frequency of multivalents. Self-incompatibility is operative in three species both at diploid and tetraploid level. Both T. corniculata and T. hamosa seem to have played a role in the origin of T. polycerata.