Amino Acid, Carbohydrate, Glutathione, Mineral Nutrient and Water Potential Changes in Non-water-stressed Picea mariana Seedlings After Transplanting
Monthly changes in amino acids, carbohydrates, glutathione and minerals in needles and roots, and the growth of transplanted and non-transplanted black spruce [Picea mariana (Mill) B.S.P.] seedlings during one growing season were compared. Seedlings were watered throughout the growing season. Shoot water potential did not differ significantly between control and transplanted seedlings. However, growth reduction in transplanted seedlings suggests that other transplant-induced effects reduced growth. Compared with control seedlings, needles of transplanted seedlings showed significantly lower levels of all macronutrients and some micronutrients, certain individual and total amino acids and sucrose. Needles of transplanted seedlings showed higher concentrations of tryptophan and certain carbohydrates. Transplanted seedling roots had relatively minor differences in nutrient and biochemical constituents compared with control seedling roots. The total amino acid content of the needles appeared to have potential for use as a biochemical indicator of transplant shock in non-water-stressed black spruce seedlings.