Re: Age of plants

 

Here is a link to the latest published dendrogram or phylogenetic tree that researchers at the Rancho Santa Ana Botanic have produced for members of the genus Iris (there are a few control entries from closely related genera at the bottom).

http://www.rsabg.org/iris/phylogeny

It deviates in a few places from older arrangements of the genus based on physical characteristics. The only thing that really stands out to me is the separation of Iris siberica from other Siberian iris; it has 28 chromosomes like I. sanguinea and I. typhifolia and crosses with them are quite fertile. Maybe that needs to be retested?

Ken Walker

On 12/20/2012 12:12 PM, Darlene Moore wrote:
Â

Chuck,

Thanks for this information. I had to google "Dendrograms" and cram
abit on them. That is pretty fascinating.

Darlene Moore

On 12/19/2012 9:07 PM, Chuck Chapman wrote:
>
> A neat question, but not a simple answer. Basically, the age is
> established by hybridizing records and by historical records. but it
> is tricky t o prove current clone is same one described. For example
> "Dalmatica" Briefly, there seems to be several clones, but none may be
> the original.
>
> A process of creating Dendrograms can establish the age and
> relationship of species, and probably could be used to establish
> relative age of a clone. This is done by comparing parts of DNA to see
> what variation is present and finding age of divergence from main
> branch. As changes occur slowly. This is not accurate on short time
> periods. Usually on time scale of thousands of years. And requires
> detailed work on a good number of selected plants.
>
> This is being done on many plant genus to establish genetic
> connections. Being used on plants and animals to show evolutionary
> links. And has resulted in many changes in plant and animal
> evolutionary trees.
>
> Chuck Chapman
>
> -----Original Message-----
> From: Darlene Moore <d*@carolinarubber.com
> d*@carolinarubber.com>
> To: iris-species <i*@yahoogroups.com
> i*@yahoogroups.com>
> Sent: Wed, Dec 19, 2012 3:14 pm
> Subject: [iris-species] Age of plants
>
>
> How do we know the age of a certain iris plant?
> Also, it has been said that certain clones have been around centuries.
> Do we know that just by description in literature?
> Is there any scientific method to date a species? Outside of the
> fossil
> record, if any.
>
> Darlene Moore
>
>

--
Darlene Moore
Carolina Rubber & Specialties, Inc.
Phone: 336-744-5111 Fax: 336-744-5101
Email: d*@carolinarubber.com


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