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Periclinal Nature of the Ivy-leaf Sport in Potatoes

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Abstract

THE use of X-ray treatment1 can produce from periclinal chimeras of potatoes (Solanum tuberosum L.) a small frequency (about 5–10 per cent) of plants which have at least the two outer layers at the growing point (L1 and L2) with the constitution of L1 in the chimera. Sports for large changes in leaf shape2 probably always have a mutated L2 and in many cases the mutation is also in L3. Such sports cannot therefore be shown to be chimeras by either breeding or eye-excision experiments; this explains why the ivy-leaf sport (Figs. 1a and b) has not previously been shown to be a chimera.

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References

  1. Howard, H. W., Rad. Bot., 4, 361 (1964).

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  2. Howard, H. W., Wainwright, J., and Fuller, J. M., Genetica, 34, 113 (1963).

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  3. Howard, H. W., Nature, 208, 197 (1965).

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  1. Plant Breeding Institute, Trumpington, Cambridge

    H. W. HOWARD

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  1. H. W. HOWARD
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HOWARD, H. Periclinal Nature of the Ivy-leaf Sport in Potatoes. Nature 209, 108–109 (1966). https://doi.org/10.1038/209108b0

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