Varietal differences in ovicidal response to the white-backed planthopper Sogatella furcifera (Hemiptera: Delphacidae) and susceptibility to Southern rice black-streaked dwarf virus in rice
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The recent spread of Oryza sativa L. (rice) ssp. indica-derived cultivars in East and Southeast Asia increases the risk of white-backed planthopper, Sogatella furcifera, and Southern rice black-streaked dwarf virus (SRBSDV) outbreaks. We compared the degree of ovicidal response to S. furcifera and susceptibility to SRBSDV among two Oryza sativa ssp. japonica, two Oryza sativa ssp. indica and one Oryza sativa ssp. indica-derived rice cultivars. The ovicidal response of the O. sativa ssp. indica-derived cultivar was significantly higher than that of the tested O. sativa ssp. indica cultivars and was equivalent to that of the O. sativa ssp. japonica cultivars that we used, supporting previous findings that the ovicidal response is higher in O. sativa ssp. japonica cultivars than in O. sativa ssp. indica cultivars and is a quantitative trait controlled by a few relevant genes. Contrary to the varied ovicidal response, the SRBSDV infection rate among the cultivars and the height of SRBSDV-infected plants between most pairs of cultivars did not differ significantly, although twisting of the leaf tips, a typical symptom of SRBSDV, was not observed in the O. sativa ssp. japonica cultivars. These results indicate that damage by S. furcifera and SRBSDV can occur in O. sativa ssp. japonica as well as in O. sativa ssp. indica and O. sativa ssp. indica-derived cultivars; therefore, in the cultivation of O. sativa ssp. japonica, measures should also be taken against white-backed planthopper during high levels of emergence.
KeywordsOryza sativa ssp. japonica Oryza sativa ssp. indica Resistant cultivar Egg mortality Stunted growth
We thank Kayoko Abe, Etsuko Kawano and Reiko Yamada for assisting in the insect and plant preparations for our experiments. This study was supported by the Research and Development Projects for Application in Promoting a New Policy of Agriculture, Forestry and Fisheries (23034) of the Ministry of Agriculture, Forestry, and Fisheries Japan.
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