The present invention provides methods for obtaining plants that exhibit useful traits by perturbation of plastid function in plant rootstocks and grafting the rootstocks to scions. Methods for identifying genetic loci that provide for useful traits in plants and plants produced with those loci are also provided. In addition, plants that exhibit the useful traits, parts of the plants including seeds, and products of the plants are provided as well as methods of using the plants. Recombinant DNA vectors and transgenic plants comprising those vectors that provide for plastid perturbation are also provided.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made with Government Support under a grant from the Department of Energy (DE-FG02-10ER16189 and 25-1215-0051-001), United States Department of Agriculture-National Institute for Food and Agriculture (USDA/NIFA 2012-31100-06031) and the National Science Foundation (IOS 1126935). The government has certain rights to this invention.