Biolistic transfer and expression of a uidA reporter gene in different tissues of Allium sativum L

The biolistic particle delivery system was used to transfer the uidA gene into different garlic tissues, including regenerable calli. These tissues showed a high endogenous nuclease activity preventing exogenous DNA expression. After submerging the tissues for 24 h in a 2 mM solution of the nuclease inhibitor aurintricarboxylic acid, transient expression of the uidA gene was detected. Furthermore, vacuum infiltration of aurintricarboxylic acid into the garlic tissues significantly increased the percentage of explants showing transient expression. Among four plasmids tested, pDE4 containing the CaMV35S-uidA construct produced the best results.