Genetically Masked of Dorsocentral Bristle Expression by a Single Dominant Gene DCm in Melon Fly, Zeugodacus cucurbitae (Coquilett)
Other Title
瓜實蠅 [Zeugodacus cucurbitae (Coquillett)]「背中區剛毛」 受單一顯性基因DCm 抑制表現之研究
Journal
台灣農業研究
Journal Volume
69
Journal Issue
2
Pages
113-121
Date Issued
2020-06
Author(s)
Yun Cheng
Dong-Hong Wu
Zu-Hsien Wang
Hsiu-Ying Lu
Chung-Min Yang
鄭允
吳東鴻
王志賢
呂秀英
楊崇民
Abstract
The melon fly, Zeugodacus cucurbitae (Coquilett), does not possess the dorsocentral (DC)
bristles. In a selected DC (+)-line, two rows of 4–6 median size macrochaetes appeared in the dorsocentral
domain of scutum and it is interesting to explore its morphological identity and genetic origin.
In morphology, these DC (+) bristles fit into the dorsocentral domains of Diptera chaetotaxy ground
plan and those of model insect species, Drosophila melanogaster and Ceratitis capitata. In genetics,
by crossing wild type to DC (+)-line, the majority of F1 progeny were DC (–) phenotype or wild type.
Segregation pattern of DC (+) and DC (–) phenotypes in the F2 progeny fit a 1 : 3 inheritance pattern,
with DC (–) phenotype being dominant. The backcross of F1 to the DC (+)-line produced a 1 : 1 ratio
in respect to DC (+) and DC (–) phenotypes, while F1 backcross to wild type produced most DC (–)
progeny, confirming that DC (+) bristle was suppressed by a single dominant gene. The gene was given
the symbol DCm for DorsoCentral bristles masked. The DC (+) bristle was stereotype patterned
instead of randomly expressed, hence the atavistic origin is preferred.
雙翅目「中胸背板」上剛毛之數量分布及排列模式是分類的重要依據，其中「背中區剛毛」在瓜實蠅所屬
的Dacinae 亞科中已因演化而消失。行政院農業委員會農業試驗所飼育之瓜實蠅中，有一「中胸背板多剛毛」
品系中頻頻出現具兩列整齊排列「背中區剛毛」的個體。此等個體上「背中區剛毛」之來源及發生原因，具有
剛毛發生及遺傳上之研究價值。本研究特將具此特徵之瓜實蠅另行育成DC (+)-line 品系，以供研究之用。
Subjects
Dorsocentral bristles
melon fly
Atavistic origin
背中區剛毛
Publisher
農業試驗所
Type
journal article
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