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Articles

Physiology of Tuberization in Solanum tuberosum L

cis-Zeatin Riboside in the Potato Plant: Its Identification and Changes in Endogenous Levels as Influenced by Temperature and Photoperiod ^{1 ,2}

Department of Plant and Soil Sciences, University of Maine, Orono, Maine 04473

Using high pressure liquid chromatography, the cucumber cotyledon bioassay, and mass spectrometry a cytokinin isolated from Solanum tuberosum L. cv. Katahdin plant tissues has been identified as cis-zeatin riboside. Zeatin riboside (ZR) levels in plants grown under inducing conditions (28 C day and 13 C night with a 10-hour photoperiod) were significantly higher than those in plants grown under noninducing conditions (30 C day and 28 C night with an 18-hour photoperiod). The highest level of ZR was noted in below-ground tissue after 4 days exposure to inducing conditions, with tuber initiation observed after 8 days. A companion study conducted to determine the effect of ZR on in vitro tuberization of noninduced rhizomes revealed that after 1 month in culture, controls exhibited 0% tuberization, while ZR treatments of 0.3 and 3.0 milligrams per liter showed 39 and 75% tuberization, respectively.

⁴ To whom reprint requests should be sent.

¹ This investigation was supported in part by funds made available through the Hatch Act to the Maine Life Sciences and Agriculture Experiment Station.

² This paper represents part of the M.S. dissertation of C. S. M.

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