Changes in Photosynthetic Capacity in Rice Leaves from Emergence through Senescence : Analysis from Ribulose-1,5-bisphosphate Carboxylase and Leaf Conductance

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概要

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• Changes in the rates of gas exchange and the amount of ribulose 1,5-bisphosphate (RuBP) carboxylase protein were determined in the 12th leaf blades of rice during the reproductive stages. RuBP carboxylase exhibited a large change similar to that in the assimilation rate at 2% O_2 throughout the leaf's life, but its decrease during senescence was barely faster than the decrease in the assimilation rate. Consequently, the overall relationship was slightly curvilinear. By contrast, leaf conductance decreased more slowly than the assimilation rate which resulted in the intercellular CO_2 concentration increasing during senescence. In order to determine the maximum activity of RuBP carboxylase at the intercellular CO_2 concentration, the kinetic parameters and their pH response were determined using purified, and completely activated, rice RuBP carboxylase. The maximum carboxylase activity at the intercellular CO_2 concentration was linearly correlated with the assimilation rate at 2% O_2 (r=0.989), and was very close to that needed to account for the assimilation rate. We conclude that changes in both the amount of RuBP carboxylase protein and leaf conductance reflect the change in photosynthesis during the life span of the leaf.

• 日本植物生理学会の論文

著者

• Ohira Koji

  Department Of Agricultural Chemistry Tohoku University

• Ohira Koji

  Department Of Agricultural Chemistry Faculty Of Agriculture Tohoku University

• Mae Tadahiko

  Department of Agricultural Chemistry, Tohoku University

• Mae Tadahiko

  Tohoku Univ. Sendai Jpn

• MAKINO Amane

  Department of Applied Biological Chemistry, Faculty of Agriculture, Tohoku University

• Ohira Koji

  Department Of Agricultural Cheimistry Faculty Of Agriculture Tohoku University

• Mae Tadahiko

  Department Of Agricultural Chemistry Faculty Of Agriculture

• MAKINO Amane

  Department of Agriculture, Graduate School of Agricultural Science, Tohoku University:CREST, JST

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