Genetics of Wing Polymorphism in the Arrhenotokous Thrips nigropilosus Uzel

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  • NAKAO Shiro
    Department of Environmental Systems, Faculty of Systems Engineering, Wakayama University
  • YABU Shinobu
    Department of Environmental Systems, Faculty of Systems Engineering, Wakayama University

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Other Title
  • 産雄性単為生殖を行うクロゲハナアザミウマ (Thysanoptera, Thripidae) における翅多型の遺伝様式
  • サン ユウセイタンイ セイショク オ オコナウ クロゲハナアザミウマ Thys

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The genetic mechanism controlling wing-length phenotype in females of the arrhenotokous Thrips nigropilosus was determined by crossing experiments under both short-day and long-day conditions. The geographic variation in the genetic component involved in wing-length phenotype determination was also investigated with seven local population samples. The frequencies of LW-form (long wing) and SW-form (short wing) observed in crossing experiments usually coincided with those predicted from a single pair of alleles with short wing being dominant to long wing. However, in some crosses, the ratio of the two forms did not coincide with the expected one. These results suggested that the wing form is not only governed by a pair of alleles on a single locus but also modified by other factors. A dominant short wing gene was found in Wakkanai and Otoineppu, but not in Abashiri, Asahikawa, Kyoto, Nagasaki and Naha. Based on the results of this and previous studies, we discussed the evolution of wing polymorphism in the female of this thrips.

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