Funding
E.C.B. and L.K. were supported by the USDA National Institute of Food and Agriculture Specialty Crop Research Initiative project ”AppleRoot2Fruit: Accelerating the development, evaluation and adoption of new apple rootstocks” (2016-51181-25406). LK was also supported by the USDA National Institute of Food and Agriculture, Hatch/State project 1014919 and NC-140 Multistate Project “Improving Economic and Environmental Sustainability in Tree-Fruit Production Through Changes in Rootstock Use”, accession no. 1013833.