| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Research Abstract |
Eight kinds of Japanese tussah, Antheraea yamamai, which inhabited in different area, were examined on twisting behavior just after hatching. The number of times on twisting was 11 to 15 after hatching, subsequently, the number decreased as instars go by. Five times of twisting behavior were observed in the larvae after 4th molting. Definite difference was not recognized among eight regional strains. On the other hand, the twisting behavior of Antheraea pernyi, Caligula jonasii, Caligula japonica and Actias artemis was different each other. Consequently, it is considered that the twisting behavior is one of the important characters in Lepidptera.
Dispersal behavior of the newly hatched larvae of the silkworm, Bombyx mori, was examined in several strains, and they were classified into active, inactive and intermediate strain. Active dispersal strain D1 selected from c440 and inactive strain D2 from N 17 Daizo were established and used in the experiments. The mixture of the newly hatched larvae of D1 (oc oily skin) and F_1 hybrid (D1xD2) was left for 15 minutes in the dark. Their larvae divided by movement distance were reared separately and investigated on the larval skin characteristics. Most of larvae moved over 60-75 mm from center were oily skin, though the larvae moved less than 30 mm were normal and oily. It was concluded that the genotype of dispersal is able to distinguish by the movement distance. In the result in BF_1 {(D1xD1)xQ1} experiment, the gene of dispersal behavior was independent of 2nd and 5th chromosome. We are analyzing the linkage of dispersal gene by cDNA linkage, since the segregation of dispersal is not clear in other crosses.
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