| Project/Area Number |
10460023
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
植物保護
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| Research Institution | OKAYAMA UNIVERSITY |
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Principal Investigator |
NAKASUJI Fusao Faculty of Agriculture, OKAYAMA UNIVERSITY, Professor, 農学部, 教授 (20109317)
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| Co-Investigator(Kenkyū-buntansha) |
TSUKUDA Ritsuko Faculty of Agriculture, OKAYAMA UNIVERSITY, Assistant Prof., 農学部, 助手 (10032989)
FUJISAKI Kenji Faculty of Agriculture, OKAYAMA UNIVERSITY, Professor, 農学部, 教授 (10228976)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1998: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Keywords | diamondback moth / Plutella xylostella / wild host plant / cabbage / flight activity / fecundity / flight fuel / host plant habituation / 栽培寄主植物 / 生活史形質 / 野生アブラナ科植物 / グリセライド / 他の栄養成分 / 移動分散多型 |
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| Research Abstract |
The wild crucifers, Rorippa indica and Lepidium virginicum, are known to serve as host plants for the diamondback moth (DBM), Plutella xylostella, but they are less suitable than the preferred cultivated cruciferous plant, cabbage, in terms of adult body size and fecundity. The life history traits and flight activity of DBM adults grown on various host plnts were investigated. In general, female adults grown on the wild crucifers were less fecund and lived longer than those reared on cabbage. Flight activity was higher in adults grown on wild crucifers than in those reared on cabbage. Male adults flew longer than females. Fecundity, longevity, flight activity and morphometrical characters of adults were positively correlated with pupal weight in individuals reared on the same host plant. A negative relationship was found between fecundity and flight activity in females of the same size group grown on different host plants, but a positive one was observed in different sized females reared on the same host plant. The amounts of glycerides tended to be higher in teh adults grown on R.indica than in those grown on cabbage. The amounts of other nutrients, glycogen, total sugars and free amino acids tended to be lower in the adults grown on R.indica than in those grown on cabbage. These facts suggest that larval host plants influence nutrient allocation between flight fuel and egg production in the DBM.Changes in the ability of the DBM to habituate to wild host plants, R.indica and cabbage for four generetions were examined. For both habituated lines, R.indica and cabbage, the developmental period of R.indica line was shorter than that of cabbage line. The fecundity of female adults was not different between R.indica and cabbage lines. This fact suggests that the DBM of R.indica line have habituated in some degree to R.indica.
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