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.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Macnicol PKdoi
10.1104/pp.60.3.344subject
Has Abstractpub_date
1977-09-01 00:00:00pages
344-8issue
3eissn
0032-0889issn
1532-2548journal_volume
60pub_type
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