Effects of genotype variation in the cultivated rice species on the biology and galling characteristics of the African rice gall midge, Orseolia oryzivora (Diptera: Cecidomyiidae)

This study assessed the effects of genotype variations in two cultivated rice species: Oryza glaberrima and Oryza sativa on the biology and galling characteristics of the African rice gall midge (AfRGM), Orseolia oryzivora Harris and Gagné. The study was conducted in the screen house at ambient temp...

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Veröffentlicht in:Entomological science 2010-09, Vol.13 (3), p.320-327
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description This study assessed the effects of genotype variations in two cultivated rice species: Oryza glaberrima and Oryza sativa on the biology and galling characteristics of the African rice gall midge (AfRGM), Orseolia oryzivora Harris and Gagné. The study was conducted in the screen house at ambient temperature (27 ± 3°C), 70 ± 5% relative humidity and 12:12 h photoperiod. Shoot galling, the most visible response of rice genotypes to attack by the insect, was greatly suppressed, being only 0.7 cm long in the O. glaberrima genotypes compared to 34 cm in the O. sativa species. Larval mortality (70-88%) in the O. glaberrima genotypes was significantly higher at the first instar compared to O. sativa. Gall setting was confirmed to be an irredeemable tiller loss. Even in the susceptible O. sativa genotypes, where many larvae may colonize a tiller, only one survived to the second instar. Resistant and susceptible rice genotypes had significantly different effects on the development and reproductive anatomy of the AfRGM. The female reproductive anatomy which consists of two ovaries, each with a potential complement of 192 eggs was affected by interspecific variation in rice genotypes causing reduced potential fecundity (32); morphological distortion, 60% reduction of egg size of F1 emergent in O. glaberrima compared to emergent from the susceptible O. sativa genotypes.
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source Wiley-Blackwell Journals
subjects Biology
Cecidomyiidae
Cultivars
Diptera
Entomology
Genotype & phenotype
interspecific variation
morphological distortion
Orseolia oryzivora
Oryza glaberrima
Oryza sativa
oviposition
reproductive anatomy
Rice
susceptible rice
title Effects of genotype variation in the cultivated rice species on the biology and galling characteristics of the African rice gall midge, Orseolia oryzivora (Diptera: Cecidomyiidae)
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