EFFECT OF CO_2 CONCENTRATION ON PHOTORESPIRATION, SUCROSE SYNTHESIS, AND CARBON TRANSPORT IN C_3 AND C_4 PLANTS
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概要
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The synthesis of sucrose from the glycolate pathway was investigated in relation to the carbon transportation at different CO_2 concentrations in the air.Tomato and maize plants were fed with ^<14>CO_2 in the light in an assimilation chamber containing 90,220,840,and 2,290 ppm of CO_2.The distribution of ^<14>C in the leaf extract with 80% ethanol, the leaf residue, and the root and stem was determined at 30 and 60 min.L-U-^<14>C-serine was supplied to tomato leaves through their cut bases in the light in the air containing 10,340,and 1,700 ppm of CO_2,and the radioactive compounds formed from serine were analyzed. The following results were obtained. 1) The proportion of ^<14>C transported from the leaves decreased in maize but not in tomato at lower CO_2 concentration. 2) The proportion of ^<14>C in glycine, serine, and malic acid in the leaf extracts increased corresponding to the decrease of that in starch at lower CO_2 concentration in tomato at 30 min.At 60 min, the proportion of ^<14>C in glycine and serine decreased and that in starch increased at lower CO_2 concentration.On the other hand, the influence of CO_2 concentration on the proportion of ^<14>C in the metabolites was small for maize. 3) The amounts of ^<14>C in the leaf extract and residue significantly increased in tomato with an increase in photosynthesis, but that in the leaf residue in maize was constant regardless of the photosynthesis and CO_2 concentration. 4) From L-U-^<14>C-serine, the incorporation of ^<14>C into the CO_2 evolved and the intermediates of glycolate pathway increased and that into starch decreased at lower CO_2 concentration in tomato. From these results it was considered that sucrose is synthesized mainly from the intermediates of glycolate pathway at lower CO_2 concentration and from the intermediates of Calvin cycle at higher CO_2 concentration in tomato and only from the latter in maize.One of the roles of photorespiration was thought to be the maintenance of the carbon transport in C_3 plants.
- 一般社団法人日本土壌肥料学会の論文
著者
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YAMAUCHI Minoru
Depart, hent of Agricultural Chemistry
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Yamada Yoshio
Department Of Agricultural Chemistry Faculty Of Agriculture
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