Project/Area Number |
02660047
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Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
植物保護
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Research Institution | Mie University |
Principal Investigator |
KISIMOTO Ryoiti Mie University, Faculty of Bioresources, Professor, 生物資源学部, 教授 (10135428)
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Co-Investigator(Kenkyū-buntansha) |
YAMADA Yoshihiro Mie University, Faculty of Bioresources, Associate Professor, 生物資源学部, 助教授 (40144232)
|
Project Period (FY) |
1990 – 1992
|
Project Status |
Completed (Fiscal Year 1992)
|
Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1992: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1991: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1990: ¥1,600,000 (Direct Cost: ¥1,600,000)
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Keywords | Planthoppers / Delphacidae / Life history strategy / Wing polymorphism / Photoperiod / Body size / Diapause / Host plant / 翅型 / 長・短翅型 / 日長条件 / 翅型多型 |
Research Abstract |
Morphological and ecological properties of 42 species of planthoppers commonly found in western Japan were investigated.Planthoppers infest predominantly on Graminae and a few infest on Cyprinae,Araceae andCommelinae.Their host range is narrow.Most planthoppers infest perennial grasses.Large planthoppers infest tall grasses and small species infest short plants.Tall plant provides2to3habitats for planthoppers,upper foliar portion,medium and bottom part of the plant vegetation.Each habitat harbours a habitat specialized planthopper. Wing form productivity was classified into3types,A:producing short wing form predominantly in the two sex under favorable condition.Under unfavorable conditions of food and overcrowding long wing form appears in equal proportions in the two sexes(A1).at higher proportions in male(A2)or at higher proportions in female(A3). B:No short wing males have been detected and short wing females appear predominantly(B1) or at low proportions(B2). C:no short wing forms
… More
have been detected. Planthoppers overwinter as adult,the 4th stage nymph, or egg, all in diapause. Six species of tropical origin do not enter diapause.They immigrate from the south each year or found in south of Okinawa. Planthoppers respond to photoperiod in the wing-form production in addition to diapause induction.Stenocraninae,Saccharosydninae and Stirominae,mostly overwinter as adult,do not show wing polymorphism,except Terauchiana singularis in which the white type appears in the overwintering generation induced by a short photoperiod and the black one in summer generation induced by a long photoperiod. In Sogatellana semicirculara and probably Kossiwigianella exigua,which overwinter as adult production of short-wing form in the two sexes were promoted by short photoperiod.In most species which overwinter as nymph the short-wing males appear predominantly or exclusively in the overwintered generation. In Dicranotropis tikuzenensis short-wing males appear in transient photoperiods longer than the short photoperiod inducing nymphal diapause. In certain species which overwinter as egg in diapause,short-wing male and female appear predominantly under a short photoperiod. From these facts it was suggested that the photoperiod affects proximately the planthopper life history in wing polymorphism production in addition to diapause induction ultimately. Less
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