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Plant Physiology 45:429-434 (1970)
© 1970 American Society of Plant Biologists

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Asparagine Biosynthesis by Cotton Roots

Carbon Dioxide Fixation and Cyanide Incorporation 1

Irwin P. Ting and William C. Zschoche

a University of California, Riverside, California 92502

Asparagine is the dominant amino acid in cotton root tips (Acala SJ-1). Two biosynthetic pathways may be operative. First, asparagine is an ultimate product of nonphotosynthetic CO2 fixation. Whereas short term 14CO2 labeling experiments indicate that malate is the predominant product, asparagine appears exponentially and does not appear to be in an active metabolic pool. Other products labeled with 14CO2 are citrate, aspartate, and glutamate. No neutral components are labeled. Secondly, asparagine is synthesized via a pathway starting with cyanide. Major amino acid products labeled with 14CN– are {beta}-cyanoalanine and asparagine. Similarly to CO2 fixation, asparagine synthesized from cyanide is not in an active metabolic pool. Other products labeled include anion and neutral components. The exact nature of the latter is not known.

1 In part, this investigation was supported by the Agricultural Research Service, Department of Agriculture, Contract 12-14-100-9493 (34), administered by the Crops Research Division, Beltsville, Maryland, and by United States Public Health Service Training Grant AP 00008. Mr. W. C. Zschoche was a graduate assistant supported by Department of Agriculture Contract 716-15-4.




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The Arabidopsis thaliana Isogene NIT4 and Its Orthologs in Tobacco Encode beta -Cyano-L-alanine Hydratase/Nitrilase
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[Abstract] [Full Text] [PDF]


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