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Plant Physiology 49:388-392 (1972)
© 1972 American Society of Plant Biologists

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Articles

Development of Chlorophyll and Hill Activity 1

Kenneth D. Nadler2, Helen A. Herron and S. Granick

Rockefeller University, New York, New York 10021

A sensitive luminometer is used to measure directly the low rates of oxygen evolution during greening of etiolated barley (Hordeum vulgare L. var. Wong) leaves. Oxygen evolution is measured in leaf segments infiltrated with p-benzoquinone. When illuminated, these leaves do not produce significant amounts of oxygen until the end of the lag phase of chlorophyll synthesis. Chlorophyll is increased by feeding {delta}-aminolevulinic acid to leaves in the lag phase, but this does not cause an earlier appearance of photosynthesis. Chloramphenicol, and to a lesser extent cycloheximide, when fed to leaves together with {delta}-aminolevulinic acid, strongly inhibit the development of oxygen evolution in the light while only slightly inhibiting chlorophyll synthesis. The ability to evolve oxygen develops to only a slight extent in darkness, even in the presence of high levels of chlorophyll.

We conclude that the development of photosystem II is limited by the synthesis of proteins in both the cytoplasm and the plastid, not by chlorophyll synthesis. Prolonged illumination is necessary for the development of oxygen evolution.

2 Present address: Department of Botany and Plant Pathology, Michigan State University, East Lansing, Mich. 48823.

1 This work was supported by Public Health Service Grant GM-4922.






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Copyright © 1972 by the American Society of Plant Biologists