Abstract
IN a recent communication Ashby1 has criticized certain conclusions which I have drawn from an experiment2 dealing with the problem of heterosis in Lycopersicum crosses. It was shown in this experiment that, in general, there is little correspondence between the presence of heterosis, measured as increase in fresh weight, in the seed and in the mature hybrid 145 days after sowing, and various possible reasons for this were discussed. Ashby suggests that there is another possible explanation which has been overlooked, namely, that correlations between seed weight and ‘final weight’ had been destroyed by the process of transplantation which took place in the 47th day after sowing, and he produces evidence to support this possibility. This evidence is in itself of great interest, but I consider that it in no way invalidates my conclusions, for the following reasons:
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References
Ashby, E., NATURE, 144, 712 (1939).
Luckwill, L. C., J. Gen., 37, 421 (1939).
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LUCKWILL, L. Heterosis in Lycopersicum Crosses in Relation to Seed Weight. Nature 144, 908 (1939). https://doi.org/10.1038/144908a0
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DOI: https://doi.org/10.1038/144908a0
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