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The enzyme (-) S-adenosyl-L-methionine-magnesium protoporphyrin methyltransferase, which catalyzes the transfer of the methyl group from (-) S-adenosyl-L-methionine to magnesium protoporphyrin to form magnesium protoporphyrin monomethyl ester, has been detected in chloroplasts isolated from Zea
The C-5 of 5-aminolaevulinate, a tetrapyrrole precursor which accumulates when inhibitory laevulinate is present, is derived from either the C-2 of glycine by the 5-aminolaevulinate-synthase-mediated Shemin pathway or the C-1 of 2-oxoglutarate by the C5 pathway. Thin-layer-radiochromatographic
We have found nuclear, recessive mutants in Zea mays L. where assembly of the major chlorophyll (a/b) light-harvesting complex (LHC) was not delayed relative to most other thylakoid protein complexes during thylakoid biogenesis. This contrasts with the normal development of maize chloroplasts (NR
Using mass spectroscopy, we demonstrate as much as 93% enrichment of the 7-formyl group oxygen of chlorophyll b when dark-grown, etiolated maize leaves are greened under white light in the presence of 18O2. This suggests that a mono-oxygenase is involved in the oxidation of its methyl group
Changes in the rate of CO2 uptake, chlorophyll a fluorescence and contents of metabolites were measured during illumination and darkening of maize leaves. Upon illumination, the contents of aspartate and alanine declined rapidly and there were rapid increases in the contents of 3-phosphoglycerate
Effects of nitrogen deficiency on photosynthetic CO(2) assimilation, PSII photochemistry and photoinhibition were investigated in maize plants grown under natural illumination. Nitrogen-deficient plants had a significantly smaller CO(2) assimilatory capacity, but they showed little changes in the