Possible Interaction: Carotenoids and Copper

“Chlorophylls and carotenoid levels also decreased with the excess of copper , a fact that may have affected the photosystem II-dependent of chlorophyll and caused photosynthesis suppression.”

“ConclusionsThus, U. compressa displays a short-term response to copper stress enhancing the expression of genes encoding proteins involved in photosynthesis, enzymes involved carotenoids synthesis , as well as those belonging to the Calvin-Benson cycle, which may result in an increase in C assimilation.”

“Photosynthetic pigments viz total chlorophyll and carotenoids were increased in low concentrations and decreased in high concentrations of Cu.”

“ Copper induces carotenoid production in a ΔcorSR mutant at lower concentrations than with the wild-type strain due to lack of expression of a gene product resembling subunit III of cbb3-type cytochrome c oxidase.”

“However, with the addition of 100 and 200 mg Cu x kg(-1), the chlorophyll and carotenoid contents of treatment pH 4.0 were lower, while the O2 divided by, H2O2 and MDA contents were higher thanthose of treatment pH 5.0.”

“A significant concentration-dependent decline of chlorophyll a (chl a) and carotenoid occurred as a consequence of Cu exposure.”

“The leaf chlorophyll and carotenoid contents of both cultivars decreased with increasing Cu concentration.”

“The leaf chlorophyll a, b and carotenoid contents decreased with increasing Cu concentration.”

“As happens for the blue light, copper activates the transcription of the structural genes for carotenoid synthesis through the transcriptional activation of the carQRS operon.”