COMPARATIVE STUDIES ON THE PHOTOSYNTHESIS OF HIGHER PLANTS : V. Differences in the Rate of Sugar Formation from Radioactive Compounds among C_4-plants

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The rate of sugar formation from aspartate-^<14>C(U) and alanine-1-^<14>C was examined under various light intensities in three C_4-plants. The results obtained were as follows. The rates of sugar formation from aspartate-^<14>C(U) became larger in the following order, Paspalum urvillei, Egragrostis ferrunginea, and Zoysia japonica. This order agreed well with the order of their photosynthetic rates measured by gas analyzer. In all the C_4-plants, there were three steps in the sugar formation curve from aspartate-^<14>C(U). At first, sugar linearly increased with an increase in the light intensity up to 20 klux. Second, from 20 to 40 klux, it hardly increased with an increase in the light intensity. Third, above 40 klux, it increased linearly again. On the other hand, the plateau did not exist between 20 and 40 klux in the sugar formation curves from alanine-1-^<14>C in any of the cases, and sugar continued to increase with an increase in the light intensity up to 80 klux. At low light intensities, the amount of CO_2 released from aspartate-^<14>C(U) and alanine-1-^<14>C correlated well with the magnitude of the dark respiration in the C_4-plants. At a high light intensity, however, CO_2 release closely correlated with the thickness of mesophyll layers surrounding the vascular bundle sheath. The thicker the mesophyll layers were, the smaller the release of CO_2 became. From this evidence, we conclude that the mesophyll layers play a vital role in refixation of the internal CO_2 in the light.
社団法人日本土壌肥料学会の論文

COMPARATIVE STUDIES ON THE PHOTOSYNTHESIS OF HIGHER PLANTS : V. Differences in the Rate of Sugar Formation from Radioactive Compounds among C_4-plants

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