TKM6 - a source of resistance to rice tungro spherical virus (Philippines)
1985
Daquioag, R.D. | Cabauatan, P.Q. | Hibino, H.
It was noted that IR20, IR26, IR30 and IR40 were infected mostly with RTBV alone indicating their resistance to RTSV during both seasons. Their common parent is TKM6. This variety and other varieties used as parents in the breeding of IR20, IR26, IR30 and IR40 were evaluated to determine the source of resistance to RTSV. Test seedlings were inoculated individually in test tubes by one viruliferous leafhopper (Nephotettix virescens) that were allowed access to TN1 plants infected with either RTBV and RTSV or RTSV alone. The presence of tungro-associated viruses in the inoculated seedlings were determined by latex test. Results showed that TKM6 were not infected with RTSV but were mostly infected with RTBV alone. This indicates that the resistant gene to RTSV in the four IR varieties originated from TKM6
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