Levels of Carboxyarabinitol 1-Phosphate and Related Photosynthetic Components during Leaf Development in Phaseolus vulgaris : GROWTH AND DEVELOPMENT : PROTEINS, ENZYMES AND METABOLISM

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概要

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• The influence of leaf development on the levels of carboxyarabinitol l-phosphate (CA1P), carboxyarabinitol (CA), CA1P phosphatase activity, ribulose bisphosphate carboxylase (rubisco) activity, photosynthesis, and rubisco catalytic sites was examined in Phaseolus vulgaris. Leaves were sampled at mid-day or after 15 h dark over a 3 week growth period. Mid-day initial rubisco activities were comparable to net photosynthetic rates, reaching 245 μmol (mg Chl)^<-1> h^<-1> at 67-100% full size (26-30 μmol m^<-2> s^<-1>). CA1P and CA were present at substantial levels in leaves of all ages (light and dark-treated, respectively), increasing by similar amounts throughout expansion. Total rubisco catalytic sites increased 2.4-fold to 58 nmol (mg Chl)^<-1> during leaf growth to 66% full size, remaining constant with further expansion. CA1P phosphatase activity was particularly low in the youngest leaves, and increased 14-fold during leaf expansion. CA1P content of dark bean leaves (nmol per mg Chl) was always in excess of total rubisco catalytic sites throughout development, but decreased from 2.2-fold (mol CA1P per mol sites) in the youngest leaves to 1.4-fold at maturation. The number of rubisco catalytic sites bound to CA1P in the dark was measured in different aged leaves after extracting leaves with 25 mM ammonium sulfate, which stabilizes the in vivo level of CA1P bound to rubisco. These measurements demonstrated that in the youngest leaves relatively much less CA1P was bound to rubisco catalytic sites in the dark. This was in contrast to what occurred in dark-treated older leaves, in which a large proportion of catalytic sites were bound with CA1P. We suggest that in very young bean leaves either rubisco has a reduced affinity for CA1P, or much of the CA1P in dark leaves may be bound to another, unidentified cellular component(s).

• 日本植物生理学会の論文

著者

• Moore B

  Univ. Nevada Nv Usa

• Seemann J

  Univ. Nevada Nv Usa

• Seemann Jeffrey

  Department Of Biochemistry University Of Nevada

• Moore Brandon

  Department of Botany, Washington State University

• Moore Brandon

  Department Of Biochemistry University Of Nevada

• Charlet Therese

  Department of Biochemistry, University of Nevada

• Kiirats Olavi

  Biological Sciences Center, Desert Research Institute

• Kiirats Olavi

  Biological Sciences Center Desert Research Institute

• Charlet Therese

  Department Of Biochemistry University Of Nevada

関連論文

• The Influence of Leaf Development on the Expression of C_4 Metabolism in Flaveria trinervia, a C_4 Dicot
• Carboxyarabinitol 1-Phosphate Phosphatase from Leaves of Phaseolus vulgaris and Other Species
• Levels of Carboxyarabinitol 1-Phosphate and Related Photosynthetic Components during Leaf Development in Phaseolus vulgaris : GROWTH AND DEVELOPMENT : PROTEINS, ENZYMES AND METABOLISM
• Activities of Principal Photosynthetic and Photorespiratory Enzymes in Leaf Mesophyll and Bundle Sheath Protoplasts from the C_3-C_4 Intermediate Flaveria ramosissima
• Expression of Genes for Photosynthesis and the Relationship to Salt Tolerance of Alfalfa (Medicago sativa) Cells
• Photosynthetic Characteristics of Cassava (Manihot esculenta Crantz), a C_3 Species with Chlorenchymatous Bundle Sheath Cells
• ^CO_2 Labeling Studies of 2-Carboxyarabinitol 1-Phosphate Synthesis

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