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Synthesis and Interconversion of Amino Acids in Developing Cotyledons of Pea (Pisum sativum L.)

Peter K. Macnicol
Peter K. Macnicol
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Published September 1977. DOI: https://doi.org/10.1104/pp.60.3.344

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  • © 1977 American Society of Plant Biologists

Abstract

Freshly isolated cotyledons from 10-day developing pea (Pisum sativum) seeds were fed radiolabeled precursors for 5 hours, and the specific radioactivity of the free and total protein amino acids was determined using a dansylation procedure. When the seven most abundant amino acids in phloem exudate of pea fruits (asparagine, serine, glutamine, homoserine, alanine, aspartate, glycine) were fed singly, their carbon was distributed widely among the aliphatic amino acids, proline and tryptophan; sporadic labeling of tyrosine and histidine also occurred. Feeding of glucose led to relatively greater labeling of aromatic amino acids including phenylalanine. The data support the involvement of known plant pathways in these interconversions. Labeling patterns were consistent with participation of the cyanoalanine pathway in the conversion of serine to homoserine, and with the synthesis of histidine from adenosine. All of the labeled amino acids were incorporated into protein.

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Synthesis and Interconversion of Amino Acids in Developing Cotyledons of Pea (Pisum sativum L.)
Peter K. Macnicol
Plant Physiology Sep 1977, 60 (3) 344-348; DOI: 10.1104/pp.60.3.344

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Synthesis and Interconversion of Amino Acids in Developing Cotyledons of Pea (Pisum sativum L.)
Peter K. Macnicol
Plant Physiology Sep 1977, 60 (3) 344-348; DOI: 10.1104/pp.60.3.344
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Plant Physiology
Vol. 60, Issue 3
September 1977
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