Abstract
The present paper concerns a morphological and cytological comparison between the naturally occurring diploid and the colchicine induced tetraploid ofTorenia fournieri Lind.
Treatment of growing points of young seedlings with 0.20% aqueous colchicine for 10 hours on two successive days was most effective in inducing tetraploidy. The induced tetraploids showed the usual “gigas” characters associated with autotetraploidy. There was a significant reduction in pollen fertility and seed setting of tetraploids as compared to their diploid progenitors.
The chromosome numbers of the diploids and the induced tetraploids were determined as n=9 and n=18, respectively. The diploids showed normal meiosis whereas tetraploids were characterized by a high frequency of unequal distribution of chromosomes at anaphase. The induced tetraploids possessed larger flowers. The variability in flower size of the tetraploids offers a good scope for evolving a better horticultural variety of this species.
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Tandon, S.L., Bhutani, K. Morphological and cytological studies of colchicine-induced tetraploids inTorenia fournieri lind. Genetica 36, 439–445 (1965). https://doi.org/10.1007/BF01557175
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DOI: https://doi.org/10.1007/BF01557175