Expression and integration of a foreign gene in orange (Citrus sinensis Osb.) protoplasts by direct DNA transfer.

Abstract
Protoplasts isolated from suspension cultured cells or orange (Citrus sinensis Osb.) were treated with a bacterial plasmid DNA carrying a chimeric gene consisting of the nopaline synthase promoter, the aminoglycoside phosphotransferase II [APH(3'')II] structural gene from the bacterial transposon Tn 5 and a terminator region from cauliflower mosiac virus DNA. Colonies capable of proliferating in a medium containing kanamycin (25 .mu.g/ml) possessed APH(3'')II activity and an intact foreign gene. The transformation frequency was recorded to be in the order of 10-6.