Cellular oxidations and the synthesis of amino-acids and amides in plants 



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Protein N. 



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1-5- 



10 



05 



Total GSH 



f 



m 



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2 4 



DAYS GERMINATION 

 Figure 6. Changes of glutathione during the development of barley embryos. 

 Samples 0/50-100 embryos were extracted with 2-5 per cent, sulphosalicylic 

 acid; glutathione (GSH) was estimated by the nitroprusside reaction, before 

 and after reduction on a mercury cathode. Changes of total insoluble JV (pro- 

 tein) are shown in the upper part of the figure. 



8 



presence of appreciable quantities of other peptides, which have not as yet been 

 characterized. The study of these peptides, and particularly of their rate of turnover 

 during the assimilation of nitrogen, may provide more decisive evidence concerning 

 the mechanisms of protein synthesis in the cells. 



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