Variations in the amino acid composition of xylem sap of Betula pendula Roth. trees due to remobilization of stored N in the spring

1998 ◽  
Vol 21 (7) ◽  
pp. 715-722 ◽  
Author(s):  
P. Millard ◽  
R. Wendler ◽  
A. Hepburn ◽  
A. Smith
Keyword(s):  
Amino Acid ◽  
Amino Acid Composition ◽  
Acid Composition ◽  
Betula Pendula ◽  
Xylem Sap ◽  
Betula Pendula Roth

Amino acid composition of xylem and phloem sap varies in canola genotypes differing in nitrogen- and sulfur-use efficiency

2011 ◽  
Vol 62 (3) ◽  
pp. 198 ◽  
Author(s):  
Tatjana Balint ◽  
Zdenko Rengel
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Amino Acid Composition ◽  
Acid Composition ◽  
Xylem Sap ◽  
Vegetative Stage ◽  
Total N ◽  
Phloem Sap ◽  
Use Efficiency ◽  
N Use

There is little information on amino acid composition of xylem and phloem sap in canola genotypes differing in use efficiency of nitrogen (N) and/or sulfur (S). Four canola genotypes with either high or low N- and/or S-use efficiency indices were grown in a glasshouse using deficient or adequate N and/or S supply. Xylem sap was obtained by vacuum extraction 46 days after sowing. Phloem sap was collected via bleeding from the petioles of the maturing siliques 120 days after sowing. Among the genotypes, Wesway (N-use efficient) had the highest concentrations of total N, glutamine (235 mmol/L), and asparagine (14 mmol/L) in the xylem sap in the vegetative stage. In contrast, genotype Westar (classified previously as N-use inefficient) had the highest concentrations of most amino acids in the phloem sap among genotypes grown at deficient N supply. Compared with the other tested genotypes, Surpass 402 CL (S-use efficient) had a higher concentration of S, and Karoo (S-use inefficient) had higher concentrations of glutamate and methionine, in the xylem sap in the vegetative stage. Similarly, Karoo had a higher concentration of methionine under adequate S supply and of glutamate under deficient S in the phloem sap at maturity. In conclusion, in canola phloem sap, the most important amino acid for N transport is glutamine, and for S transport methionine and the glutathione-precursor glutamate. It does not appear there is a relationship between differential N- or S-use efficiency of canola genotypes and the concentration of N- or S-transporting amino acids in the phloem sap.

Amino acid composition in xylem sap of soybean related to the evaluation of N2fixation by the relative ureide method

1995 ◽  
Vol 41 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Norikuni Ohtake ◽  
Toshikazu Nishiwaki ◽  
Kazushi Mizukoshi ◽  
Ritsuko Minagawa ◽  
Yoshihiko Takahashi ◽  
...  
Keyword(s):  
Amino Acid ◽  
Amino Acid Composition ◽  
Acid Composition ◽  
Xylem Sap

scholarly journals Xylem sap nitrogen compounds of some Crotalaria species

1999 ◽  
Vol 56 (3) ◽  
pp. 733-737 ◽  
Author(s):  
Angela Pierre Vitória ◽  
Ladaslav Sodek
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Amino Acid Composition ◽  
Acid Composition ◽  
Organic Nitrogen ◽  
General Pattern ◽  
Xylem Sap ◽  
Nitrogen Compounds ◽  
Legume Species ◽  
Major Amino Acid

Thirteen species of Crotalaria were analysed for nitrogen compounds in the xylem root bleeding sap. Amino acids were the main form of organic nitrogen found, but only traces of ureides were present. Of the four species analysed for amino acid composition, asparagine was found to be the major amino acid, accounting for over 68% of the nitrogen transported. No striking deviations from this general pattern was found between species, between vegetative and floral stages of development, or between nodulated and non-nodulated plants. It was concluded that the Crotalaria species studied here have an asparagine-based nitrogen metabolism, consistent with many other non-ureide-producing legume species.

Effect of maternal diet on the amino acid composition of human uterine fluid

2014 ◽  
Author(s):  
Alexandra Jayne Kermack ◽  
Ying Cheong ◽  
Nick Brook ◽  
Nick Macklon ◽  
Franchesca D Houghton
Keyword(s):  
Amino Acid ◽  
Amino Acid Composition ◽  
Acid Composition ◽  
Maternal Diet ◽  
Uterine Fluid
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