Transgenic Tobacco Plants Expressi ng Tomato Tm-2~2 Display Resistanc e Specificity to Tobamoviruses
The fact that the Tm-2~2 g ene expressed in the transgenic to bacco suggested that the Tm-2~2 res istance property functioned comple tely without any change in diffe rent genera of the Solanoideae fam ily.Tm-2~2-transformed tobacco plan ts were resistant to 5 strains of T obamoviruses and the resistance wa s overcome by the virus breaker To MV-GM65.This result indicated that amino acid variation in the movement protein of ToMV could affect the re sponse activity of R protein to ToMV infection.The infection symptoms d iffering in two types of transform ant suggested that the promoter co ntrolling the expression of Tm-2~2 gene played a significant role in the resistant reaction.