Grapevine Rootstock Impacts on Shoot System Phenotypes: Preliminary Data from an Experimental Vineyard in Mount Vernon, MO

Clonally propagated and grafted crop species provide the optimal study system for understanding the ability of the rootstock to modulate shoot system phenotypes. An experimental vineyard (‘Chambourcin’ vineyard) was established at The University of Missouri Southwest Center Agricultural Experiment Station in 2009 in Mount Vernon, MO. The vineyard includes a locally important common scion (‘Chambourcin’) maintained as own-rooted, ungrafted vines and also grafted to three different rootstocks (‘3309C’ - V. riparia x V. rupestris; ‘1103P’ - V. berlandieri x V. rupestris; ‘SO4’ - V. berlandieri x V. riparia). The full factorial experiment with varied rootstock and irrigation regimes includes 288 vines (8 replicates of 4 rootstock - scion combinations x 9 treatment blocks (3 replicates of 3 irrigation regimes: full replacement of evapotranspiration losses (ET), 70% replacement of ET, and non-irrigated). Preliminary data collected in the ‘Chambourcin’ vineyard indicate ion concentration, leaf shape, vine physiology, and berry chemistry vary as a function of rootstock. Future work will extend sampling in the ‘Chambourcin’ vineyard over the next three years.