772 Hall, Miller, and Herrero 



Three metabolites were found in the ether-soluble fraction, the major 

 one being associated with carotene. Eight metabolites were found in 

 the alcohol-soluble fraction; a peptide, because of its similarity to tryp- 

 tophan, was studied in some detail. After solvent extraction of the 

 treated tissue with various reagents, the bulk of the fixed radioactivity 

 remains associated with the cell wall constituents. Evidence shoAving 

 that fixation of the activity atypical of carbon dioxide was presented. 

 The physiological significance of the findings and the possible re- 

 lationship of ethylene to phosphorylation reactions, chlorosis, color- 

 ing, and ripening changes, interaction with auxin and cell wall modi- 

 fications are briefly presented and discussed. 



ACKNOWLEDGMENT 



This work was supported in part by Contract No. AT(40-l)-2456 

 United States Atomic Energy Commission and PHS Research Grant 

 RG-6398. 



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