Provision of carbon skeletons for amide synthesis in non-nodulated soybean and pea roots in response to the source of nitrogen supply

Autor: Motoki Ikeda, Satoshi Ueda, Takeo Yamakawa
Rok vydání: 2008
Předmět:
Zdroj: Soil Science and Plant Nutrition. 54:732-737
ISSN: 1747-0765
0038-0768
DOI: 10.1111/j.1747-0765.2008.00293.x
Popis: Soluble amino acids in roots and primary amino acids, which were involved in primary ammonium assimilation, in the metabolites of 14C-glucose fed to roots for 3 h in the dark were analyzed in the roots of non-nodulated soybean and pea plants grown in ammonium, nitrate or nitrogen-free media for 1 day. Compared with the effect of nitrate, ammonium supply strongly affected the content and synthesis of the amino acids in the roots. In both soybean and pea roots, the supply of ammonium increased considerably the concentrations of the primary amino acids, and asparagine was the most predominant amide, followed by glutamine. In nitrate-supplied soybean roots, the concentrations of asparagine, aspartate and alanine increased, but the concentration of glutamine was low. In the roots of pea plants grown in nitrate media, asparagine was the predominant amino acid, although the composition of the primary amino acids was little affected by nitrate supply. The proportion of amino acids synthesized from 14C-gl...
Databáze: OpenAIRE
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