Abstract
Sunflower (Helianthus annuus L.) plants were grown on nutrient solution with ammonium nitrogen. After 12 days of growth the ammonium in the nutrient solution was labeled with 15N (99%). Three hours later glutamine-N in the xylem exudate was labeled for 56% as shown by GC-MS; this percentage increased to 63% after 8, and to 69% after 24 hours of incubation. When the xylem exudate had been collected from the epicotyl instead of the hypocotyl, 15-N abundances were 52%, 56% and 63% respectively. Results are consistent with an import of glutamine into the transpiration stream during its ascension in the xylem. On basis of the differences in abundance of double-labeled, single-labeled and unlabeled glutamine between the two sampling sites it was estimated that at least 20% of the xylem glutamine was imported into xylem along this distance (∼4 cm).
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© 1990 Kluwer Academic Publishers
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Findenegg, G.R., Plaisier, W., Posthumus, M.A., Melger, W.C. (1990). Transport of glutamine into the xylem of sunflower (Helianthus annuus). In: van Beusichem, M.L. (eds) Plant Nutrition — Physiology and Applications. Developments in Plant and Soil Sciences, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0585-6_18
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DOI: https://doi.org/10.1007/978-94-009-0585-6_18
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-6751-5
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