Fluoride‐induced enhancement and inhibition of shoot growth in four taxa of Pinus
1989
Doley, D.
Pinus elliottii Englem. Var. elliottii (PEE) and three varieties of Pinus caribaca morelet [var. caribaca barr. Et Golf. (PCC), var bahamensisi Barr. et Golf. (PCB) and var. hondurensis (PCH)] were grown at gaseous hydrogen fluoride concentrations of 0.0, 1.2, 1.8 and 4.3 μ F m⁻³ during a period of 200 d. Extension growth of the mainstem and lateral branches was not significantly affected by fluoride in any taxon. Overbark diameter increment at the stem base was signicantly greater at 1.2 μg F m⁻³ than at 0, 1.8 or 4.3 μ F m⁻³ in all taxa, and also near the stem apex in PEE. Only in PEE was the stem base diameter increment lower at 4.3 μ F m⁻³ than in control plants. Lateral branch diameter increments were not signicantly affected by ambient fluoride concentration. Stem base diameter increments in all taxa linearly related to the rates of photosynthesis I needles 4–8 weeks old.
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