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Geographic variation and genetic aspects of reproductive diapause in Drosophila triauraria and D. quadraria
Author(s) -
KIMURA MASAHITO T.
Publication year - 1983
Publication title -
physiological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 57
eISSN - 1365-3032
pISSN - 0307-6962
DOI - 10.1111/j.1365-3032.1983.tb00347.x
Subject(s) - diapause , biology , backcrossing , hybrid , photoperiodism , reproduction , drosophila (subgenus) , zoology , botany , genetics , larva , gene
. Geographic variation and genetic aspect of reproductive diapause were studied in Drosophila triauraria Bock & Wheeler and D. quadraria Bock & Wheeler, in relation to their quantitative response to photoperiods. D. quadraria from the subtropical region had no photoperiodic diapause. In D. triauraria strains, diapause was induced under LD 10:14 or 12:12, but not under LD 14:10 or longer photoperiods. Their diapause was induced more effectively and maintained longer by LD 10:14 than by LD 12:12. The duration of diapause was longer in a northern strain, but the diapause inducing process varied little among different geographical strains. Diapause incidence was 50% or lower in F 1 hybrids between D. triauraria and D. quadraria and backcross progenies between F 1 and D. quadraria , and about 70% in backcross progenies between F 1 and D. triauraria under LD 10:14, but very low under LD 12:12. The lower incidence of diapause in these F; and backcross progenies is assumed to be due to the less efficient induction of diapause, since once diapause was induced in them, it was maintained for a long time, especially in the backcross progenies between F 1 and D. triauraria. These experiments suggest that diapause induction and maintenance are different physiological processes controlled by different genetic systems.