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Abstract
Action of some respiratory inhibitors on the greening of apices of etiolated pea. — Aim of the research is to study the effect of some of the best kown respiratory inhibitors on the greening of etiolated apices of peas excised from the plant and kept in light in solutions containing saccharose. The inhibitors studied may act on more than one of the reactions leading to the synthesis of the chlorophyll molecule.
The following can be concluded from the present study:
1. A good level of chemical energy seems to be necessary for greening.
2. Terminal iron-oxidases seem to be necessary in this process, while a stimulating effect on greening may be attributed to an inhibition of the terminal copper-oxidases (particularly ascorbic-oxidase); the effect can be explained with the hormonal control of greening by the indoleacetic/ascorbic system.
3. Enzymes of the Krebs cycle regulate both the uptake of the essential metabolites starting from the chlorophyll molecule and the production of chemical energy.
4. Some enzymes of the glycolysis take part in some of the reactions leading to the synthesis of the chlorophyll molecule.