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Science 23 November 1973:
Vol. 182. no. 4114, pp. 838 - 839
DOI: 10.1126/science.182.4114.838
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Articles

Spring Shoot Growth in Douglas-Fir May Be Initiated by Gibberellins Exported from the Roots

D. P. Lavender 1, G. B. Sweet 1, J. B. Zaerr 1, and R. K. Hermann 1

1 School of Forestry, Oregon State University, Corvallis 97331

Trials conducted under controlled environments demonstrated that the delay of bud activity of Douglas-fir (Pseudotsuga menziesii) seedlings occasioned by low temperature of the soil could be eliminated by application of gibberellic acid. Analyses of field-grown plants showed a parallel increase in bud activity, level of gibberellin-like compounds in xylem sap, and soil temperature during February and March.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)