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Peach is an economically import fruit crop worldwide, and serves as a model species of the Rosaceae family as well. However, peach functional genomics studies are severely hampered due to its recalcitrance to regeneration and stable transformation. Here, we report a fast and efficient  Agrobacterium rhizogenes -mediated transformation system in peach. Various explants, including leaf, hypocotyl and shoot, were all able to induce transgenic hairy roots, with a transformation efficiency of over 50% for hypocotyl. Composite plants were generated by infecting shoots with  A. rhizogenes  to induce transgenic adventitious hairy roots. The composite plant system was successfully used to validate function of an anthocyanin-related regulatory gene  PpMYB10.1  in transgenic hairy roots, and two downstream genes,  PpUFGT  and  PpGST , were strongly activated. Our stable and reproductive  A. rhizogenes -mediated transformation system provides an avenue for gene function assay, genetic engineering, and investigation of root-rhizosphere microorganism interaction in peach.

Development of a fast and efficient root transgenic system for functional genomics and genetic engineering in peach