Carbon skeletons for amide synthesis during ammonium nutrition in tomato and wheat roots

Ikeda, Mitsuru; Kusano, Takeshi; Koga, Noboru

doi:10.1080/00380768.2004.10408462

Cited by 11 publications

(15 citation statements)

References 16 publications

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“…The arg peak that appeared after the end of flowering was surprising in view of the low mobility of this molecule, which is adsorbed on cell walls and moves only by Ca exchange (Dickson, 1989). However, the presence of arg could be related to a lack of C skeletons necessary for its transformation into gln (Ikeda et al, 2004) before transport in sap. Likewise, in Malus trees, a more C-cost-effective storage is produced in N fertilised apple trees by increasing the proportion of arg in the protein N storage (Cheng et al, 2004).…”

Section: Article In Pressmentioning

confidence: 92%

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Mobilisation of nutrients and transport via the xylem sap in a shrub (Ligustrum ovalifolium) during spring growth: N and C compounds and interactions

Guérin

Huché-Thélier

Charpentier

2007

Journal of Plant Physiology

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Section: Article In Pressmentioning

confidence: 92%

“…Amides, such as gln, are an efficient chemical form for N storage and transport due to their low C cost (Dickson, 1989;Ikeda et al, 2004). In Populus, gln comes from lysis of protein bodies (Sauter and van Cleve, 1992); nevertheless, gln represents 75% of the sap amino acids and only 1.3% of the protein.…”

Section: Article In Pressmentioning

confidence: 98%

Mobilisation of nutrients and transport via the xylem sap in a shrub (Ligustrum ovalifolium) during spring growth: N and C compounds and interactions

Guérin

Huché-Thélier

Charpentier

2007

Journal of Plant Physiology

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“…Fukuyutaka) and pea ( Pisum sativum L. cv. Hakuryuu) plants were grown in the same procedures as described previously (Ikeda et al . 2004).…”

Section: Methodsmentioning

confidence: 99%

“…The plant parts were frozen at –80°C and lyophilized. Free amino acids were extracted and purified from dried roots as previously described (Ikeda et al . 2004) and liquid‐chromatographic determination of the amino acids was carried out according to the method of Yamaya and Matsumoto (1988).…”

Section: Methodsmentioning

confidence: 99%

“…After ammonium (4 mmol L −1 ) was supplied to various plants for 24 h, Asn was the most predominant among the amino acids synthesized from 14 C‐glucose in wheat and rice roots, whereas in tomato and cucumber roots it was Gln (Ikeda et al . 2004, 2005; Koga and Ikeda 2000). These results suggest that there may be a difference among plant species in the predominance of amide synthesis in roots in response to ammonium supply.…”

Section: Introductionmentioning

confidence: 99%

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

Ueda

Ikeda

Yamakawa

2008

Soil Science and Plant Nutrition

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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‐glucose increased and asparagine rather than glutamine was predominantly synthesized in ammonium‐supplied soybean and pea roots, whereas in nitrate‐supplied roots asparagine was more actively synthesized than glutamine, although asparagine was not predominant. The ratio of C4 (asparagine + aspartate) to C5 (glutamine + glutamate) amino acids was twofold higher in ammonium‐supplied and nitrate‐supplied soybean roots than in roots receiving no nitrogen. In contrast, in pea roots, the C4/C5 ratio was twofold higher only in ammonium nutrition. The results obtained suggest that the roots of leguminous plants might possess an indigenous ability to provide a carbon skeleton for preferential synthesis of asparagine rather than glutamine with a high intensity of ammonium supply.

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High irradiance improves ammonium tolerance in wheat plants by increasing N assimilation

Setién

Fuertes‐Mendizábal

González

et al. 2013

Journal of Plant Physiology

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Carbon skeletons for amide synthesis during ammonium nutrition in tomato and wheat roots

Cited by 11 publications

References 16 publications

Mobilisation of nutrients and transport via the xylem sap in a shrub (Ligustrum ovalifolium) during spring growth: N and C compounds and interactions

Mobilisation of nutrients and transport via the xylem sap in a shrub (Ligustrum ovalifolium) during spring growth: N and C compounds and interactions

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

High irradiance improves ammonium tolerance in wheat plants by increasing N assimilation

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