Changes in the Rate of Photosynthesis during Grain Filling and the Enzymatic Activities Associated with the Photosynthetic Carbon Metabolism in Rice Panicles

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概要

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• Photosynthesis is known to occur in rice panicles, but little has been reported about the pho-tosynthetic or biochemical characteristics of such panicles. The estimated gross amount of photo-synthetically assimilated CO_2 in a panicle is 30% of that in a flag leaf. This result and the good light-intercepting characteristics of the panicle in the canopy suggest that photosynthesis in the panicle may contribute significantly to grain filling. The rice panicle is composed of spikelets and of rachis-branches including rachis which have estimated gross rates of photosynthesis during the 30-day period after anthesis of 130 to 180 and 50 to 100 μmol CO_2・(mg Chl)^<-1>・h^<-1>, respectively. The corresponding rate for the flag leaf is 180 to 230 μmol CO_2・(mg Chl)^<-1>・h^<-1>. On the basis of Chl, spikelets have a high photosynthetic capability which is similar to that of the flag leaf. The activities of ribulose-1,5-bisphosphate carboxylase (RuBPCase), phosphoenolpyruvate carboxylase (PEPCase), and pyruvate,P_i dikinase (PPDK) in spikelets were 129, 220, and 87 μmol・(mg Chl)^<-1>・h^<-1>, respectively. The activities of PEPCase and PPDK in spikelets were considerably higher than those in the flag leaf or rachis-branches. Oxygen-insensitive photosynthesis was found only in spikelets. The K_m of NaHCO_3 for photosynthesis by slices of spikelets in an aqueous solution (0.6 mM) was considerably lower than that for slices of flag leaf (4.2 mM). All these results indicate that spikelets have different photosynthetic characteristics from those of the flag leaf and rachis-branches. The possibility of C_3-C_4 intermediate photosynthesis or C_4-like photosynthesis in spikelets is discussed.

• 日本植物生理学会の論文

著者

• Usuda H

  Teikyo Univ. School Of Medicine Tokyo Jpn

• Usuda Hideaki

  Laboratory Of Chemistry Teikyo University School Of Medicine

• Usuda Hideaki

  Laboratory Of Chemistry Faculty Of Medicine Teikyo University

• Imaizumi N

  Japan Turfgrass

• Ishihara K

  Tokyo Univ. Agriculture And Technol. Tokyo Jpn

• Ishihara Kuni

  Laboratory Of Crop Science Faculty Of Agriculture Tokyo University

• Imaizumi Nobuyuki

  Laboratory of Crop Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology

• Nakamoto Hitoshi

  Radioisotope Center, the University of Tokyo

• Nakamoto Hitoshi

  Radioisotope Center The University Of Tokyo:(present)department Of Biochemistry Faculty Of Science S

• Usuda Hideaki

  Laboratory Of Chemisry Teikyc University School Of Medicine

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