The effect of glucose on the biochemical and ultrastructural characteristics of developing Euglena chloroplasts.
The Journal of protozoology
confidence
Key findings
Glucose inhibits Euglena chloroplast development, delaying chlorophyll accumulation, ultrastructure, and photosystem I/II activities.
View source on PubMed (PMID 102787) ↗
- Sample size
- not_reported
- Population
- Euglena gracilis strain Z (algae, in vitro)
- Dosing
- glucose-containing medium
- Duration
- up to 48+ hours of greening
- Route
- culture medium
- Blinding
- not_reported
- Controls
- active_comparator
- Drug class
- porphyrin pigment
Full abstract
Chloroplast development is inhibited in Euglena gracilis strain Z, when greened in a medium containing glucose. This inhibition is reflected not only in the pattern of chlorophyll accumulation but also in the chloroplast ultrastructure and activities of the 2 light reactions of photosynthesis. Chloroplasts of cells greening in the presence of glucose are delayed in developing certain structures. Photosystem I activity develops at about the same rate as that of the controls during the first 48 h of greening, after which it develops at a slower rate. The rate of development of photosystem II activity in cells greening in a glucose medium lags considerably behing that of the controls until the later hours of greening. There are similarities between glucose inhibition and chloramphenicol inhibition of chloroplast development. Glucose may inhibit a step in chloroplast development ultimately controlled by the chloroplast genome.