Abstract：
:Experiments have been carried out to determine the basis for the dependence of chloroplast pigment synthesis on protein synthesis in dark-grown cells of Euglena gracilis greening in the light. The complete inhibition of chlorophyll synthesis brought about by actidione (10 μg/ml) when added half way through the greening process was not relieved, even to the slightest extent, when 0.01 M δ-aminolaevulinic acid (ALA) was also present. The much smaller inhibition of chlorophyll synthesis brought about by chloramphenicol (2 mg/ml) was also relieved little, if at all, by the addition of ALA. It is concluded that the inhibition of chlorophyll synthesis by actidione can not be solely or primarily due to lack of ALA resulting from the decay of possibly labile enzymes of ALA synthesis, but could be due to inhibition of synthesis of the thylakoid structural protein. The results obtained with chloramphenicol are difficult to interpret because of the possibility that the drug, at high concentration, directly inhibits processes other than protein synthesis.Chlorophyll and carotenoid synthesis by E. gracilis were both markedly stimulated by the addition of ALA. It is suggested that the rate of chlorophyll synthesis in the greening cells is limited by the rate of formation of ALA. The stimulation of formation of carotenoids as well as chlorophyll may indicate that the cells have a mechanism for ensuring that the rate of carotenoid synthesis does not fall below a certain proportion of the rate of chlorophyll synthesis.A nomogram has been devised from which the concentrations of chlorophylls a and b, and total chlorophyll can be read off once the absorbances of an 80% acetone extract at 663 and 645 mμ have been determined.
journal_name
Plantajournal_title
Plantaauthors
Kirk JTdoi
10.1007/BF00406651subject
Has Abstractpub_date
1967-06-01 00:00:00pages
200-7issue
2eissn
0032-0935issn
1432-2048journal_volume
78pub_type
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