Coupling sap flow velocity and amino acid concentrations as an alternative method to (15)N labeling for quantifying nitrogen remobilization by walnut trees

• Published in: Plant physiology (Bethesda) Vol. 130; no. 2; p. 1043
• Main Authors: Frak, Ela, Millard, Peter, Le Roux, Xavier, Guillaumie, Sabine, Wendler, Renate
• Format: Journal Article
• Language: English
• Published: United States 01.10.2002
• Subjects: Amino Acids - metabolism; Arginine - metabolism; Aspartic Acid - metabolism; Biological Transport - physiology; Citrulline - metabolism; gamma-Aminobutyric Acid - metabolism; Glutamic Acid - metabolism; Juglans - growth & development; Juglans - metabolism; Light; Nitrogen - metabolism; Nitrogen Isotopes; Plant Shoots - growth & development; Plant Shoots - metabolism; Rheology - methods; Seasons; Time Factors

The temporal dynamics of N remobilization was studied in walnut (Juglans nigra x regia) trees growing in sand culture. Trees were fed with labeled N ((15)N) during 1999 and unlabeled N in 2000. Total N and (15)N contents in different tree compartments were measured during 80 d after bud burst and we...