Table 2.

Degree of resistance against Rice stripe virus (RSV) infection in transgenic rice plants induced by different RNAi-targets of RSV genes^a.

Target gene for	Location/putative functionb	GenBank accession	Resistancec
pC1	RNA polymerase	D31879	Strong
p2	Unknown	D13176	Moderate
pC2	Glycoprotein-like	D13176	Absent
p3	Silencing suppressor	X53563	Moderate
pC3	Nucleocapsid protein	X53563	Immune
p4	Crystalline inclusion	D10979	Absent
pC4	Movement protein	D10979	Immune

^aTo evaluate any resistance to RSV infection, more than 30 rice plants from three independent lines of transgenic plants were exposed to approximately 15 viruliferous RSV-carrying viruliferous small brown hopper per plant for 1 day.

^bKakutani etal. (1990), Zhu etal. (1991), Takahashi etal. (1993), Toriyama etal. (1994), Xiong etal. (2008, 2009).

^cImmune, no symptoms developed, and no virus was detected by ELISA in inoculated rice plants through harvest; Strong, weak symptoms developed but were delayed for 2–4 weeks, but growth was almost the same as for mock-inoculated rice plants; Moderate, typical symptoms developed but were delayed 2–4 weeks, and growth was slightly stunted after RSV infection; Absent, typical symptoms developed, as severe as those of RSV-infected non-transgenic rice plants.