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Plant Physiology 61:348-353 (1978)
© 1978 American Society of Plant Biologists

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Articles

Shoot, Stolon, and Tuber Formation on Potato (Solanum tuberosum L.) Cuttings in Response to Photoperiod 1

Elmer E. Ewing2

Philip F. Wareing

Department of Vegetable Crops, Cornell University, Ithaca, New York 14853, Department of Botany and Microbiology, University College of Wales, Aberystwyth, Wales SY23 3DA

The intensity of "tuberization stimulus" in potato shoots (Solanum tuberosum L.) can be assessed from cuttings containing one or more leaves. Cuttings maintained in a mist chamber under long days will form tubers from underground buds if prior to taking the cutting the leaves received sufficient exposure to photoperiods less than the critical photoperiod. The greatest tendency to tuberize was found in cuttings that consisted of a single, fully expanded leaf and its subtended bud. Grafts showed that genetical differences in critical photoperiod resided in properties of the leaf. Short days before cutting tended to shift growth from above ground buds of two-node cuttings to below ground buds, even if the number of short days was insufficient for tuber induction. As few as 6 short days reduced growth of shoots at the upper bud and increased underground growth of shoots and stolons.

2 To whom requests for reprints should be addressed.

1 This study was funded principally by National Science Foundation Grant No. BMS 74-13999 and also received support from the International Potato Center. The work was carried out while the senior author was at the University College of Wales, on sabbatical leave from Cornell University. Paper No. 734, Department of Vegetable Crops, Cornell University.




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Multiple Signaling Pathways Control Tuber Induction in Potato
Plant Physiology, January 1, 1999; 119(1): 1 - 8.
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Copyright © 1978 by the American Society of Plant Biologists