The effect of exogenous sugar solution and high concentration of CO₂ on the contents of sugar and protein ofBetula platyphylla leaves

Abstract

The content of total sugar sucrose, fructose and protein in the leaves of 3-yr-oldBetula platyphylia was measured after the treatment by three exogenous sugar solutions (sucrose, fructose, glucose) and three high concentrations of CO₂ (700, 1 400, 2 100 μL·L⁻¹) for about a month in 1998. The results showed that spraying three exogenous sugar solutions increased markedly the content of sugar and protein of leaves under 700 μL·L⁻¹ and 1 400 μ L·L⁻¹ CO₂. The effect of spraying exogenous sucrose solution was the best among the three exogenous sugars. The treatment of spraying exogenous sugar solution and 2 100 μL·L⁻¹ CO₂ constrained the accumulation of total sugar and protein of leaves. There was no different in protein content of leaves when spraying glucose and fructose solutions under 700 μL·L⁻¹ and 1 400 μL·L⁻¹ CO₂. The treatment of 2 100 μL·L⁻¹ CO₂ concentration significantly increased the contents of total sugar, sucrose, fructose, and protein of leaves compared with that of the 700 μL·L⁻¹ and 1 400 μL·L⁻¹ CO₂ except the plants spraying fructose solution. There was positive correlation between the content of sugar of leaves and CO₂ concentration when spraying same exogenous sugar solution.

Keywords

Exogenous / Sugar / Protein / High CO₂ / Betula platyphylla / S792.153 / Document code

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