ISSN:
1573-5036
Keywords:
Amino acids
;
Asparagine
;
Dopa
;
Fababean
;
Plant organs
;
Vicia faba L.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Nodulated fababeans growing in unfertilized soil were sampled at intervals during development and the plants divided into their constituent organs before extraction and determination of the separate free amino acid contents. At each developmental stage asparagine and 3,4-dihydroxyphenylalanine (Dopa) were the most abundant free amino acids in all organs except the seeds. Of the second-order constituents, there were respectively, modest amounts of serine and glutamine in the leaves, tyrosine in the pods and alanine in the young seeds. During plant development there were marked differences in both the amount and composition of the free amino acid fraction in some organs. The concentration of asparagine increased sharply during pod-fill in both stems and pods and it is suggested that this is the form in which much N is moved into the seeds for protein synthesis. Young seeds contained much free asparagine, glutamine and alanine but with time the two latter constituents were replaced by arginine. There was a rapid accumulation of Dopa in the fruits and leaves during early pod-fill but the amount decreased as the plants aged and the Dopa content of the mature seeds were extremely low.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02369977
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