Switch in pattern formation after puncturing the anterior pole of Smittia eggs (Chironomidae, Diptera)☆

[摘要] Theaberrantpattern,“doubleabdomen,”previouslyinducedintheeggofSmittiabyuvirradiationofanteriorpoleregionswasalsoproducedbypuncturingoftheeggattheanteriorpole.Doubleabdomensandembryoswithanteriordefectsdevelopedineggsinwhichpuncturinghadlocallypreventedtheregulararrangementofcleavagenucleiintheperiplasm.Theresultinggapintheblastodermattheanteriorpolewassubsequentlyclosedunderexclusionofasmallamountofeggmaterial.Doubleabdomensdidnotdevelopineggswhereexclusionofanterioreggmaterialwasnotobserved.Thusabasicswitchinthedevelopmentalprogramoftheeggappearstodependuponthefunctionaleliminationofsomecrucialcomponentsintheanterioreggregion.

[学科分类] 生物科学（综合）