Journal Article

Growth and nutrition of <i>Betula pendula</i> at different relative supply rates of zinc

Anders Göransson

in Tree Physiology

Volume 19, issue 2, pages 111-116
Published in print February 1999 | ISSN: 0829-318X
Published online February 1999 | e-ISSN: 1758-4469 | DOI:
Growth and nutrition of Betula pendula at different relative supply rates of zinc

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Small birch plants (Betula pendula Roth) were cultivated in a hydroponic spray solution where the relative growth rate (RG; day−1) was controlled by the relative supply rate of zinc (RZn; day−1). After an adjustment phase to steady-state growth, RG equaled RZn. The RZn treatments were 0.05, 0.125 and 0.20 day−1 with free access to all other nutrients. In an additional treatment, there was free access to all nutrients, including zinc (FA treatment). The pH of the nutrient solution was approximately 4.5 and conductivity was 100 μS cm−1. The duration of each treatment depended on RZn and ranged from 4 (FA treatment) to 10 weeks (at RZn = 0.05 day−1). The plants showed persistent and typical zinc-deficiency symptoms at steady-state growth when RG was 0.05 and 0.125 day−1, whereas there were few symptoms when RG was 0.2 day−1. The Zn concentration of the plants ranged from 8 (at RZn = 0.05 day−1) to 21 μg gDM−1 (DM = dry mass) (at RZn = 0.2 day−1) and was approximately 42 μg gDM−1 in the FA treatment. Uptake rates of Zn, calculated per root growth rate (μmol gDM, root−1), were about 2.8 times higher at RZn = 0.20 day−1 than at RZn= 0.05 day−1. The root and stem biomass fractions were approximately constant at all supply rates of Zn, whereas the leaf biomass fraction tended to increase with increasing supply rate of Zn. Net assimilation rate was constant from FA to an RZn of 0.125 day−1 but decreased by a factor of about 2 at RZn = 0.05 day−1. Leaf area ratio and specific leaf area were smaller at low supply rates of zinc than at high supply rates.

Keywords: biomass; birch; carbohydrate partitioning; internal concentration; nutrient proportions; steady-state growth; zinc limitation

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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