Influence of carbon dioxide concentration on growth, carbohydrate content, translocation and photosynthesis of white clover
1984
Scheidegger, U.C. | Nosberger, J.
White clover ramets were grown at various carbon dioxide concentrations (200, 350 and 1000 μl 1−1), defoliated and regrown at the same concentrations. Morphological characteristics, dry weights and non-structural carbohydrate contents of plant organs, diurnal variation of sugar and starch content of leaves, translocation of assimilates and photosynthesis were determined. Carbon dioxide concentration influenced the dry weights, but not the number and size of the plant organs. However, defoliation of plants at low carbon dioxide concentration resulted in decreased leaf size and stolon length. Carbon dioxide concentration influenced the content and diurnal variation of starch and sugar in the leaves. Starch was accumulated at medium carbon dioxide concentration and sugar at a higher concentration when the storage capacity for starch seemed to be exceeded. Starch was preferentially accumulated in the first and sugar in the second half of the light period. Translocation was decreased during the periods of accumulation. Sugar accumulation in the leaves seemed to be a consequence of the imbalance between sink and source, whereas starch accumulation seemed to follow an in-built diurnal pattern. Accumulation of both starch and sugar during the photoperiod was followed by degradation and export during the dark period. Decreased dark export occurred at low carbon dioxide concentration when neither starch nor sugar was accumulated during the photoperiod.
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