Photosynthetic Electron Transport and Carbon Metabolism during Altered Source/Sink Balance in Single-Rooted Soybean Leaves

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概要

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• The single-rooted leaf of soybean (Glycine max L. Merr.) was used to study electron transport and various reactions involved in carbon metabolism under conditions of altered source/sink balance. When the leaves grown for 5 d under a regime of 10 h of light per day (the standard growth condition, 500-580 μmol photons・m^<-2>・s^<-1>) were treated for 6 or 7 d with continuous light to alter the source/sink balance of photosynthates (the sink limit condition), the photosynthetic rate decreased to 54% of that in leaves grown under the standard condition. The decrease in photosynthesis due to the treatment with continuous light was associated with a large increase in the resistance to the movement of CO_2 from surfaces of mesophyll cell walls to intercellular sites of photosynthesis. The treatment also caused large increases in levels of NADPH and ATP and in the ratio of ATP to ADP in the leaves. The levels of ribulose 1,5-bisphosphate and dihydroxyacetone phosphate in the treated leaves rose to 460% and 160% of those in the control leaves, respectively, while the level of 3-phosphoglycerate in the former fell to 80% of the level in the latter. The treatment also caused the levels of almost all of the other phosphorylated intermediates in photosynthetic carbohydrate metabolism, with the exception of fructose 6-phosphate and adenosine diphosphate glucose, to increase by 110% to 200%. These results indicate that, under the sink limit condition, the significant decrease in photosynthetic activity was due to inactivation of photosynthetic carbohydrate metabolism rather than to a decline in photoelectron transport. Our observations also suggest that the accumulation of various phosphorylated intermediate results in a limitation of levels of P_i in chloroplast stroma and that, under such conditions, the activity of ribulose 1,5-bisphosphate carboxylase is reduced and there is a subsequent decrease in photosynthetic activity.

• 日本植物生理学会の論文

著者

• Kasai Minobu

  Department Of Biofunctional Science Faculty Of Agriculture And Life Science Hirosaki University

• Kasai Minobu

  Department Of Biology Faculty Of Science. Hirosaki University

• SASAKI Masao

  Department of Livestock Services

• Sawada Shinichi

  Department Of Biofunctional Science Faculty Of Agriculture And Life Science Hirosaki University

• Sawada Shinichi

  Department Of Biology Faculty Of Science. Hirosaki University

• Hasegawa Yasuhide

  Department of Biology, Faculty of Science, Hirosaki University

• Sasaki Masao

  Department Of Biology Faculty Of Science. Hirosaki University

• Hasegawa Y

  Hirosaki Univ. Hirosaki Jpn

• Hasegawa Yasuhide

  Department Of Biology Faculty Of Science Hirosaki University

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