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Articles

Effects of Iron and Oxygen on Chlorophyll Biosynthesis ¹

I. IN VIVO OBSERVATIONS ON IRON AND OXYGEN-DEFICIENT PLANTS

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

Corn (Zea mays, L.), bean (Phaseolus vulgaris L.), barley (Hordeum vulgare L.), spinach (Spinacia oleracea L.), and sugarbeet (Beta vulgaris L.) grown under iron deficiency, and Potamogeton pectinatus L, and Potamogeton nodosus Poir. grown under oxygen deficiency, contained less chlorophyll than the controls, but accumulated Mg-protoporphyrin IX and/or Mg-protoporphyrin IX monomethyl ester. No significant accumulation of these intermediates was detected in the controls or in the tissue of plants stressed by S, Mg, N deficiency, or by prolonged dark treatment. Treatment of normal plant tissue with -aminolevulinic acid in the dark resulted in the accumulation of protochlorophyllide. If this treatment was carried out under conditions of iron or oxygen deficiency, less protochlorophyllide was formed, but a significant amount of Mg-protoporphyrin IX and Mg-protoporphyrin IX monomethyl ester accumulated.

These results are consistent with the presence of an O₂, Fe-requiring step between Mg-protoporphyrin IX monomethyl ester and protochlorophyllide.

³ To whom reprint requests should be addressed.

¹ Supported by National Science Foundation Grant PCM 7813250.

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