Tolerance of rice varieties to tungro disease and its possible use for disease management.
1987
Hasannudin A | Gabunagan P.Q. | Hibino H.
Rates of infection with tungro in IR rice varieties increased when the number of viruliferous green leafhopper (GLH) used for increased. This shows the instability of varietal resistance to tungro when the resistant is due to the vector. The IR rice varieties rested reacted differently to rice tungro bacilliform virus (RTBV) and rice tungro spherical virus (RTSV), depending on their level of resistance to GLH. Infection by RTBV and RTSV together and RTBV alone, increased when number of viruliferous GLH increased. On the other hand, some non-IR rice varieties had low infection of RTBV and RTSV together and RTSV alone, irrespective of number of viruliferous insects used. In some non-IR varieties, RTBV infection increased with the number of viruliferous GLH increased, indicating their resistance to GLH. Some varieties tested were tolerant to tungro-associated viruses. Infected plants of these varieties showed low RTBV concentration, no discernible symptoms even when both viruses were present, and had low presentage yield reduction. Hence, varietal tolerance could be an important component in the management of tungro disease. A combination of tolerance to tungro virus and resistance to insect vector in one variety could manage tungro disease. Identification of a source to tolerance for a breeding program, as well as screening techniques, are needed. (Author).
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