Variations in starch & total polysaccharide content of Pinus ponderosa needles with fluoride fumigation

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Abstract
Controlled exposure of P. ponderosa seedlings to atmospheric F concentrations in the range of 0.5 to 10 [mu]g F-/m3 and for varying exposure durations produced an initial departure of the starch and non-starch polysaccharides values from those of the control seedlings. Seedlings exposed twice weekly 8 and 4 hours/day, throughout an 8-week period, at levels of 5 and 10 [mu]g F-/m3 respectively showed a more rapid return of the starch and non-starch polysaccharide values to those of the controls than did seedlings similarly exposed 5 times weekly, 8 hours/day, at 0.5 and 1.5 [mu]g F-/m3. The variation-range for starch and non-starch polysaccharide levels, presumably resulting from F exposure, was not sufficiently different from the variation-range in the control seedlings to permit differentiation between response to F and response to changes in weather under unknown conditions of field exposure.

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