Stressantwort induziert durch Eisenmangel auf Böden mit hohem Kalkgehalt bei Rebenunterlagen.

The project VineLresp (Stress response of grapevine rootstocks to iron deficiency through high bicarbonate soil) investigates the response of iron deficiency and high bicarbonate contents in soils of grapevine rootstocks. Lime induced chlorosis is a huge problem in agronomy and also in viticulture as many viticulture areas worldwide have high lime contents. Grapevine rootstocks show different levels of adaptation to high lime contents, but the biochemical mechanisms behind are not well understood. In model plants like Arabidopsis thaliana the information on iron uptake has been increased dramatically during the last years. VineLresp aims to close the knowledge gap between grapevine and A. thaliana in terms of root exudates composition, endodermal suberization and local and system signals within the plant. Thereby we hypothesize that root exudates in grapevine rootstocks are composed of more complex biomolecules as have been described so far and that the suberization of the endodermis can be an additional factor influencing nutrient uptake. In a step-wise approach we will investigate several aspects of grapevine rootstock physiology. We will combine physiological measurements targeted metabolite analyses, RNASeq and radiotracer analyses. The novelty of our approach is the application of standardized experimetns with high end analyses on different levels and the focus on processes yet unknown in grapevine rootstocks.