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[Arabidopsis] Re: Are the seeds from WT type At plants trandformed byfloral dip called T1 or T0?

Terry Delaney via arab-gen%40net.bio.net (by terrence.delaney At uvm.edu)
Mon Nov 27 13:26:19 EST 2006

Dear Jiang,
I agree with most of the respondants to your question, who state that
the primary (hemizygous) transformants should be referred to as T1
seeds or plants.  This is convenient as it mimics the genetic
nomenclature, as Ben Holt describes.  However as there is a bit of
confusion on this issue, I'd add that authors' should state what their
definition is when they describe their work, as it's not safe to assume
everyone agrees on this point.

Best regards,

Terry Delaney
The University of Vermont
Department of Plant Biology
Burlington, VT 05405-0086

Y Jiang wrote:
> Here are the replies I got concerning my question.
> It seems that I am right: The seeds harvested from WT Arabidopsis plants
> transformed by floral dip method are called T1(contain both WT and
> trasngenic seeds), which, after planted, produces T2 seeds.
> Thanks those who kindly replied my mail.
> Jiang
> #1
> I think this is an area of confusion in many people's minds - we had
> numerous arguments on this point while I was in grad school. I think there
> are three points to remember - 1) the seeds on a plant are always the next
> generation from the plant itself, 2) the seed and adult plant it becomes are
> the same generation, and 3) the only T0 is the parent plant that is
> transformed. Thus, T0 plants get transformed and make T1 seeds. T1 seeds
> germinate to make T1 plants and generate T2 seeds and so forth. This naming
> convention is consistent with the idea of F1/F2 or M1/M2 plants. In all
> three cases (F1s post cross, M1 post mutagenesis, T1 post T-DNA insertion),
> the generation labeled as "1" will be heterozygous/hemizygous for the
> gene/mutation/T-DNA of interest. In each case, you have to wait for the "2"
> plants to see the recessive phenotypes. And in each case you have to wait
> for the third generation to confirm that a given phenotype is no longer
> segregating.
> Hope this helps,
> Ben
> --
> Ben Holt
> Assistant Professor
> University of Oklahoma
> Department of Botany and Microbiology
> GLCH Rm 219
> 770 Van Vleet Oval
> Norman, OK  73019
> Phone (405)325-9018
> FAX   (405)325-7619
> http://www.ou.edu/cas/botany-micro/faculty/holt.html
> #2
> These are T1 plants, also known as primary transformants. The next
> generation is a segregating T2 population.
> Sincerely,
> Michael Neff
> #3
> I am interested in seeing the responses you get to your query to the
> newsgroup. I have also noticed that not everyone uses the T0 or T1
> generation naming system of transgenic plants uniformly.
> My current understanding is that the seeds/plants generated using the Agro
> floral dip method are referred to as T1's, while transformed plants
> regenerated from tissue culture are referred to as T0's. I am not sure this
> naming system is correct, but it is what I have settled on  based on what
> others have told me.
> What puzzles me, is what is the rationale for this difference in naming. Why
> is T0 the appropriate name for the original transgenics generated from
> tissue culture, when T1 is used for the original plants generated using in
> planta transformation methods?
> Please let me know what you find out.
> Thanks,
> Roger Thilmony
> #4
> Plants that are treated with Agrobacterium are called T0. Transformed seeds
> from these plants are T1.  The progeny of these T1 plants (which will be
> segregating the transgene 3:1) are called T2 plants.
> Scott
> --
> Scott Poethig
> Paul Williams Family Professor
> Biology Department
> University of Pennsylvania
> Philadelphia, PA 19104-6018
> phone: 215-898-8915
> fax: 215-898-8780
> email: spoethig At sas.upenn.edu
> >From: "Y Jiang" <jiangyqcn At hotmail.com>
> >To: arab-gen At magpie.bio.indiana.edu
> >Subject: [Arabidopsis] Are the seeds from WT type At plants trandformed
> >byfloral dip called T1 or T0?
> >Date: Tue, 21 Nov 2006 15:30:15 -0700
> >
> >Hello,
> >
> >Could someone tell me:
> >Are the seeds from WT type At plants trandformed by floral dip called T1 or
> >T0? I recently found that my calling is different from another faculty
> >member in another departement.
> >
> >Thanks,
> >
> >Jiang
> >
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