Field and screenhouse evaluation for resistance to rice tungro (RTV)
1988
Bhaktavatsalam, G. | Mohanty, S.K. | Singh, S.K. (Central Rice Research Inst., Cuttack (India). Plant Pathology Div.)
High-yielding rice varieties and lines were evaluated for field tolerance to RTV [rice tungro virus] in the 1985 wet season. Infection was scored 30 d after transplanting and field tolerance was scored after flowering. Varieties and lines scoring 1 and 3 were tested in the screenhouse in the 1986 wet season, with 20 seedlings/variety exposed to either 1 or 5 RTV-viruliferous leafhoppers Nephotettix virescens per seedling. Symptoms were scored and seedlings tested for presence of the bacilliform (RTBV) and spherical (RTSV) viruses by latex serological test. Infection rate and plant height and tiller number reduction were scored visually. Virippu and Ptb 18 scored 1 in the field but had high infection in the screenhouse. Some varieties showing field tolerance had high infection in the screenhouse. Reduction in height and tiller number was less in varieties with field tolerance score 1 than in varieties with score 3. Infection with both RTBV and RTSV was low in these varieties. Some had RTBV alone. RTSV infection alone was low (0-10%). Ambemohar 59, BJ1, and Gopalbhog were not infected with either virus. Infection and reduction in height and tiller number were higher in plants inoculated at 5 hoppers/seedling. Although Utkalprabha and Sabari had high infection in the field, by time of flowering they showed tolerance scores of 2 and 3.
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