44 



WATER-SOLUBLE ORGANIC ACIDS 



3. Some acids seem structurally related to components of the citric acid cycle but 

 the pathways connecting them have not been demonstrated. They have been so 

 indicated in the accompanying figure by question marks beside the arrows. 



4. Recent work on the metabolism of the two-carbon acids and of malonic acid 

 may be found in references (20) and (21). 



5. The necic acids, found as esters in the alkaloids of Senecio spp. , resemble 

 the terpenoids in structure; but recent tracer studies (22) indicate a route of 

 biosynthesis which involves condensation of 4 acetate units and two Ci units. 



GENERAL REFERENCES 



Buch, M. L. , U. S. Dept. Agric. A.R.S. Serv. 73-18(1957), published in 1960 as Agri- 



' cultural Handbook #164 A Bibliography of Organic Acids in Higher Plants. 

 Burris, R. H. , "Organic Acids in Plant Metabolism", Ann. Rev. Plant Physiol. 4 91 



(1953). 

 Ranson, S. L. , "Non Volatile Mono- Di- and Tricarboxylic Acids" in Paech and Tracey 



2 539. 

 Scarisbrick, R., "Volatile Acids" in Paech and Tracey 2 444. 

 Wolf, J. , "Nichtfluchtige Mono- Di- and Tricarbonsauren" in Paech and Tracey 2 476. 



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