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Plant Physiology 53:615-618 (1974)
© 1974 American Society of Plant Biologists

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Articles

The Abolition of the Lag Phase in Greening Cucumber Cotyledons by Exogenous {delta}-Aminolevulinic Acid 1

Paul A. Castelfranco, Petrovia M. Rich and Samuel I. Beale2

a Department of Botany, University of California, Davis, California 95616

Etiolated cucumber cotyledons treated with {delta}-aminolevulinic acid accumulated protochlorophyllide which was phototransformable to chlorophyll (ide). The phototransformation process in the {delta}-aminolevulinic acid-treated tissue was markedly temperature-dependent, consistent with the view that this protochlorophyllide must combine with the holochrome apoenzyme before phototransformation can occur.

The treatment which effects lag phase removal in control tissue did not affect the course of chlorophyll (ide) accumulation in {delta}-aminolevulinic acid-treated tissue under either continuous or intermittent illumination. It was concluded that the lag phase in etiolated tissues must reflect the gradual development of the ability to synthesize {delta}-aminolevulinic acid at an appreciable rate.

2 Present address: Department of Plant Pathology, University of California, Davis, Calif. 95616.

1 This investigation was supported by National Science Foundation Grant GB 31261.




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J. G Lebkuecher, K. A Haldeman, C. E Harris, S. L Holz, S. A Joudah, and D. A Minton
Development of photosystem-II activity during irradiance of etiolated Helianthus (Asteraceae) seedlings
Am. J. Botany, August 1, 1999; 86(8): 1087 - 1092.
[Abstract] [Full Text] [PDF]


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Copyright © 1974 by the American Society of Plant Biologists