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Plant Physiology 56:497-501 (1975)
© 1975 American Society of Plant Biologists

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Articles

Control of {delta}-Aminolevulinic Acid and Chlorophyll Accumulation in Greening Maize Leaves upon Light-Dark Transitions 1

Robert Fluhr, Eitan Harel, Shimon Klein and Erna Meller

a Department of Botany, The Hebrew University, Jerusalem, Israel

The accumulation of {delta}-aminolevulinic acid (ALA) was studied in greening maize (Zea mays) leaves which were transferred to darkness and reilluminated after various periods of time. The system synthesizing ALA decays in the dark with a half-life of about 80 minutes. The onset of enzyme decay after transfer to darkness shows a 40-minute lag. The accumulation of ALA in the presence of levulinic acid in leaves transferred to darkness corresponds to that expected from the estimated half-life of the enzyme synthesizing ALA. On the other hand, the accumulation of protochlorophyll upon transfer to darkness in the absence of levulinic acid stops much earlier. It is suggested that a control point exists in the pathway between ALA and protochlorophyll, preventing utilization of the accumulated ALA upon transfer of greening leaves to darkness. This is supported by the observed effects of low intensities of monochromatic light (648 nm) on ALA and chlorophyll accumulation.

1 This work was supported by a grant from the Israel Commission for Basic Research.




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Copyright © 1975 by the American Society of Plant Biologists