ISHS Acta Horticulturae 754: International Workshop on Advances in Grapevine and Wine Research
INFLUENCE OF NITROGEN NUTRITION OF GRAPEVINES ON THEIR POLYAMINE METABOLISM |
| Author: | K. Schaller |
| Keywords: | grapevine, Riesling, agmatine, putrescine, spermidine, spermine, DAP, nitrogen, fertilization, time course, concentration, content |
| Abstract:
Polyamines in grapevines are ambivalent substances: First, they represent chemical compounds which act in grapevine’s metabolism as hormones with a main influence on growth and development, and second, after their transfer in wine during processing they may have some impact on consumers health inducing allergological reactions after wine consumption. During our experiments we tried to figure out if the nitrogen nutrition of grapevines has an influence on the concentration of polyamines and also their content in different plant parts. For this purpose a fertilization trial was installed with different nitrogen levels. After an establishing period of 6 years the free polyamines, putrescine, spermine, spermidine were determined in the different plant parts (leaves, flowers and berries) until fruitset together with soluble amino acids. It was found out that already in dormant parts like old wood all polyamines were detected; already during the early phases of development rapid changes in concentrations and content could be observed. Highest dynamic occurs before and during bloomtime in the flowering organs. There is a cascade of putrescine, spermine and spermidine reaching after each other a maximum concentration until the end of flowering. Up to now it is not possible to interpret these observations on a physiological basis because these reactions may be also overlaid by exogenous effects like drought, light (UV-B) a.s.o. It should be also kept in mind that polyamines may be transferred to the must during technological operations and may influence wine quality or the fermentation process. More intensive research is necessary to elucidate the physiological importance of polyamines in grapevines and their influence on grapevine quality. | |
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