| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1988: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1987: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Research Abstract |
The objectives of this research is to determine the newly immigrated rice planthoppers,their ratios in samples and the originated locales in the South East Asia.
(1) WBPH,Sogatella furcifera lost dry body weights,lipids,Ca and Mg contents on distance flight,but recovered within 4 days in triglyceride and 1 day in metal contents by feeding rice plants on arrival to the Japanese Islands in June and July 1986 and 1987. Comparison of these variables between those caught on the East China Sea and landed on the Islands by calculating their discriminant functions enabled us to discriminate newly immigrated ones.They were counted as 4.2 to 4.5 out of 12 analyzed in each sample from Nagasaki and elsewhere, and found always in association with the synoptical frontal systems developed over the Islands.Significant differences of the variables among the ECS populations suggested variable emigrating locales.
(2) The preliminary isozymic analysis of 9 enzymes of 6 BPH strains, Nilaparvata lugens collected from the SEA by a flat polyacrylamide ion-focusing electrophoresis revealed the differences of malic enzymes and esterases between the Indonesian and Malyasian strains, and the Philippines and Taiwan strains. More extensive studies may show the geographical differences of BPH isozymes.
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