Alan R. Langille

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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(More)
Qualitative and quantitative analyses were carried out on vegetative tissues of potato (Solanum tuberosum cv. “Katahdin”) in search of natural products thought to play a role in tuber induction. Tissues were obtained from plants initially grown in a growth chamber under noninducing conditions (30°C day and 28°C night with an 18-h photoperiod), and then half(More)
Russet Burbank leaf protoplasts were cultured in Shepard’s (1980) cell layer (CL) medium containing the amino acid analog ethionine (ETN), at concentrations ranging from 0 to 6 µM. Repeated counts of viable cells and dividing colonies during the 21 day incubation period permitted calculation of plating efficiencies for each ETN concentration. Plating(More)
s will be multilithed and distributed with registration material at the Annual Meeting and published after the meeting in the American Potato Journal. Content of the abstracts should not exceed 200 words, should agree with the paper presented, and should not be written until the data collected are complete. All papers should be of publication quality and i(More)
S 60th ANNUAL MEETING THE POTATO ASSOCIATION OF AMERICA July 26-29, 1976 University of Wisconsin-Stevens Point (Part I) Minimum tillage of potatoes. KUNKEL, R., N. M. Holstad and R. E. Thornton, Washington State University, Pullman, Washington. In 1975, potatoes were planted in five fields under conditions known to be capable of stopping wind soil erosion,(More)
In an attempt to improve nutritional qualities of the potato by exploiting variation associated with protoplast regeneration, Russet Burbank leaf protoplasts were cultured in cell layer (CL) medium containing the amino acid analog, 5-methyltryptophan (5-MT) at concentrations from 0 to 286 μM. At three day intervals, numbers of viable cells and dividing(More)
Katahdin potato plants were grown in a growth chamber undernoninducing conditions and treated with three anti-gibberellin growth retardants. Other plants were sprayed with gibberellic acid and placed in aninducing growth chamber adjusted to promote tuber induction. Treatments were repeated the following week. After final treatment, apical, sub-apical,(More)