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

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Science  23 Nov 1973:
Vol. 182, Issue 4114, pp. 838-839
DOI: 10.1126/science.182.4114.838


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.