Morphological and cytological studies on induced polyploidy in Sesamum indicum L.

抄録

1) Induced polyploidy in Sesamum indicum L. by the colchicine method is described; two different methods, namely the immersion and dropping, were used, the latter proving more effective than the former.
2) As the characteristics of autopolyploidy, the tetraploid plants were extremely robust, with much thicker stems, larger leaves, stomata, flowers, and seeds than the diploids.
3) The fertilities of pollen grains and seeds per capsule from the tetraploids were comparatively high with averages of 74.10% and 77.74% respectively. But the yield of seeds per plant of the tetraploids was unfavorable.
4) Details of meiosis in diploid and tetraploid S. indicum, especially on secondary pairing, have been recorded.
On the nature of secondary polyploidy in S. indicum was discussed.