Canadian Forest Service Publications

Relating carbohydrate concentrations to photosynthetic rates and growth in Picea mariana seedlings. 1998. Lamhamedi, M.S.; Bernier, P.Y.; Lambany, G. Ann. Rech. For. Maroc T(31): 26-39.

Year: 1998

Issued by: Laurentian Forestry Centre

Catalog ID: 33728

Language: English

Availability: PDF (request by e-mail)

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Abstract

Carbohydrate concentrations of soluble sugars (glucose, fructose, sucrose, raffinose, trehalose), polyols (pinitol, mannitol, sequoyitol, inositol), organic acids (shikimic and quinic acids) and unknown sugars were determined on containerized black spruce Picea mariana [Mill.] B.S.P.) seedlings of three different types (small, medium, and large), planted in raised sand beds maintained under wet, moderately dry or dry soil moisture conditions, three occasions during the growing season. Concurrent measurements of net photosynthesis (Pn) and of relative growth rates (RGR) had shown specific differences and similarities among the three seedling types. Of all the carbohydrates measured, only quinic acid showed patterns of variation that paralleled those observed for Pn and RGR. Large concentrations of quinic acid were associated with seedling types with the highest measured Pn and RGR. No such similarity was observed with any of the other carbohydrates measured. Results suggest that quinic acid concentrations reflect current growth in the seedlings, and are largely independent of interconversions and storage processes that prevent the used of other major carbohydrates as indicators of seedling quality.