X-ray induced reciprocal translocations in Tradecantia paludosa
1959 Volume 34 Issue 5 Pages 162-167
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1959 Volume 34 Issue 5 Pages 162-167
X-radiating the resting axillary buds at 10, 000 or 5, 000r, strains heterozygous for reciprocal translocations were reared vegetatively in Tradescantia paludosa (2n=12, 6II), i.e., _??_4+4II, _??_6+3II, etc. Some of the translocation strains were irradiated again in the same way, yielding higher classes of chromosome catenation, i.e., 2_??_6, _??_8+2II, etc. (Tab. 1). Thus it is highly probable that the ultimate _??_12 strain will be reared vegetatively by successive irradiation.
So-called isochromosomes were found repeatedly. But, they were proved in certain cases, in reality, to be pseudo-isochromosome, because the two arms were unequal in their length (cf. Fig. 13).
