Photosynthetic efficiency of Panicum hians and Panicum milioides in relation to C_3 and C_4 plants

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概要

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• Panicum hians and Panicum milioides were found to have characteristics intermediate to those of C_3 and C_4 species with respect to CO_2 compensation point, percentage inhibition of photosynthesis by O_2 at various O_2/CO_2 solubility ratios, and water use efficiency. C_4 species have a higher carboxylation efficiency than either the intermediate or C_3 species. During photosynthesis, even under 2.5% O_2, C_4 species have a higher affinity for intercellular CO_2 (Km 1.6 μM) apparently due to the initial carboxylation through PEP carboxylase. Under low O_2 the intermediate and C_3 species had a similar affinity for intercellular CO_2 during photosynthesis (Km 5-7 μM) consistent with carboxylation of atmospheric CO_2 through RuDP carboxylase. There were considerable variation in photosynthesis/unit leaf area at saturating CO_2 levels in the species examined which in part is due to differences in RuDP carboxylase/unit leaf area. The highest rates of photosynthesis/unit leaf area under CO_2-saturating conditions were with the C_3 species which had a correspondingly high level of RuDP carboxylase/unit leaf area. Possibilities for the greater efficiency of P. hians and P. milioides in comparison to C_3 species in utilizing low levels of CO_2 in the presence of atmospheric O_2 are discussed. Key words: Intermediate photosynthetic species-Photosynthetic efficiency.

• 日本植物生理学会の論文

著者

• Edwards G.e.

  Department Of Botany Washington State University:institute Of Biological Chemistry Washington State

• Ku S.b.

  Department Of Horticulture University Of Wisconsin

関連論文

• Distribution of enzymes related to C_3 and C_4 pathway of photosynthesis between mesophyll and bundle sheath cells of Panicum hians and Panicum milioides
• Photosynthetic Characteristics of C_3-C_4 Intermediate Flaveria Species II. : Kinetic Properties of Phosphoenolpyruvate Carboxylase from C_3-C_4 and C_3-C_4 Intermediate Species
• Differences in cold lability of pyruvate,Pi dikinase among C_4 species
• Photosynthetic efficiency of Panicum hians and Panicum milioides in relation to C_3 and C_4 plants
• Glycolate synthesis in a C_3, C_4 and intermediate photosynthetic plant type
• Use of inhibitors to distinguish between C_4 acid decarboxylation mechanisms in bundle sheath cells of C_4 plants

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