A method of activating the rice tungro bacilliform virus (RTBV) promoter in vivo is disclosed. The RTBV promoter is activated by exposure to at least one protein selected from the group consisting of Rf2a and Rf2b.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
 The work of this invention is supported in part by a grant from the Department of Energy. The United States Government has certain rights to this invention.