The gene is a component of a large number of expression vectors and can be isolated from them using methods with which the skilled worker is familiar (such as, for example, polymerase chain reaction) (AF294981 pINDEX4; AF234301 pCAMBIA-1380; AF234300 pCAMBIA-1304; AF234299 pCAMBIA-1303; AF234298 pCAMBIA-1302; AF354046 pCAMBIA-1305.; AF354045 pCAMBIA-1305.1) genes for resistance to