From owner-dros@hgmp.mrc.ac.uk Thu Sep 14 15:18:49 2000 Return-Path: Received: by mercury.hgmp.mrc.ac.uk (Postfix, from userid 110) id 6624217B1D; Thu, 14 Sep 2000 15:18:47 +0100 (BST) Received: by mercury.hgmp.mrc.ac.uk (Postfix, from userid 6020) id 34FC417B1D; Thu, 14 Sep 2000 15:18:45 +0100 (BST) Received: by mercury.hgmp.mrc.ac.uk (Postfix, from userid 6024) id AFFDA17A9A; Wed, 13 Sep 2000 21:23:17 +0100 (BST) Received: from m2.hawaii.edu (m2.hawaii.edu [128.171.94.30]) by mercury.hgmp.mrc.ac.uk (Postfix) with ESMTP id 7F512415CF for ; Wed, 13 Sep 2000 21:23:16 +0100 (BST) Received: from [128.171.205.225] by m2.hawaii.edu (PMDF V6.0-24 #45149) with ESMTP id <0G0U00M8ZDYN2W@m2.hawaii.edu>; Wed, 13 Sep 2000 10:23:14 -1000 (HST) Date-warning: Date header was inserted by m2.hawaii.edu From: "Dr. Hampton Carson" Subject: Re: larvae turning black? To: Martin Hoehne Message-id: MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Newsgroups: bionet.drosophila Date: Thu, 14 Sep 2000 15:18:45 +0100 (BST) Sender: owner-dros@hgmp.mrc.ac.uk Precedence: bulk Dear Martin: In the work of myself, Stalker and Templeton on thelytokous parthenogenesis in Drosophila mercatorum and other species, we frequently assessed the hatchability of eggs of virgin diploid females and were able to recognize the following categories: 1) eggs that do not develop at all, 2) eggs with a brownish color that on dissection reveal a dead larva inside and 3) brownish larvae that appear to have died after hatching and 4) viable larvae. In this case, categories 2 and 3 were interpreted as having a genetic cause, A nice paper on the subject is that of one of Stalker's students, L. S. Sprackling 1960, The chromosome complement of the developing eggs produced by Drosophila parthenogenetica Stalker virgin females. Genetics 45:243-256. With raegards, Hamp Carson >Hello everybody, > >did anyone ever observe larvae that turned black? They are obviously >dead and the blackening starts at the anterior end and progresses to the >posterior end. One of the first things turning black seem to be the >salivary glands. >Is this due to contamination with a fungus? Bacteria? Or a strange >mutation? > >Any help would be appreciated, > >Martin > > >Fischbach Lab >Freiburg University, Germany > >marthoe@biologie.uni-freiburg.de .