The Influence of Leaf Development on the Expression of C_4 Metabolism in Flaveria trinervia, a C_4 Dicot
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概要
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The initial products of ^<14>CO_2 assimilation were determined under steady state illumination of leaves of Flaveria trinervia, a C_4 dicot of the NADP-malic enzyme subgroup. Leaf age influenced the partitioning of ^<14>CO_2 between the C_4 cycle and the reductive pentose phosphate (RPP) pathway. An estimated 10 to 12% of the CO_2 entered the RPP pathway directly in leaves about 20% fully expanded, whereas CO_2 was apparently fixed entirely through the C_4 pathway in leaves 75% or more expanded. This partitioning pattern was attributed to the bundle sheath compartment in young leaves having a relatively high conductance to CO_2 (i.e., being somewhat leaky). Of the initially labelled C_4 acids, the proportion that was malate, relative to aspartate, increased continuously during leaf expansion (from 60 : 40 to 87 : 13 at full expansion). Concurrently, there was an increase in the whole leaf activity of NADP malate dehydrogenase and a decrease in the activities of aspartate and alanine aminotransferases. Low chlorophyll a/b values were observed in young leaves, which may coincide with an enhanced capacity for non-cyclic electron transport in the bundle sheath chloroplasts of such tissue. Both enhanced aspartate metabolism and direct fixation of CO_2. in the bundle sheath could provide a greater sink for utilization of photochemically derived NADPH in the bundle sheath of young leaves. Such metabolic changes are discussed in relation to a possible decrease in CO_2 conductance of the bundle sheath during leaf development.
- 日本植物生理学会の論文
著者
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Moore B
Univ. Nevada Nv Usa
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Moore Brandon
Department of Botany, Washington State University
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Cheng Shu-Hua
Department of Botany, Washington State University
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Edwards Gerald
Department of Botany, Washington State University
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Moore Brandon
Department Of Biochemistry University Of Nevada
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Cheng S‐h
Washington State Univ. Washington Usa
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Cheng Shu-hua
Department Of Botany Washington State University
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Edwards Gerald
Department Of Botany Washington State University
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Edwards Gerald
Department Of Botany Washington State University:institute Of Biological Chemistry Washington State
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