Experimental evidence for diel δ15N‐patterns in different tissues, xylem and phloem saps of castor bean (Ricinus communis L.)

摘要: Nitrogen isotope signatures in plants might give insights the metabolism and allocation of nitrogen. To obtain a deeper understanding modifications nitrogen signatures, we determined δ(15)N transport saps different fractions leaves, axes roots during diel course along plant axis. The most significant variations were observed xylem phloem where was significantly higher day compared with night. However saps, this only canopy, but not at hypocotyl positions. In correlated fairly well between saps. These can be attributed to nitrate reduction leaves photoperiod as (15)N-enriched glutamine acting form N. water soluble fraction partially affected xylems patterns are likely result complex set interactions N-fluxes organs. Furthermore, natural abundance tissue is constant - fact that needs taken into account when sampling for isotopic studies.