Phytochrome and hormones

Grant R. Cramer cramer at MED.UNR.EDU
Fri Apr 30 14:28:19 EST 1999

Your explanation makes sense but is there evidence that phytochrome does not
move? There are soluble forms, correct?
Grant R. Cramer
Associate Professor
Mail Stop 200
Department of Biochemistry
University of Nevada
Reno, NV 89557
phone: (775) 784-4204
fax: (775) 784-1650
email: cramer at
web page: http://BIOCHEM.MED.UNR.EDU/faculty/grant_c/

>From: Bill Purves <purves at THUBAN.AC.HMC.EDU>
>To: cramer at ("Grant R. Cramer")
>Subject: Re: Phytochrome and hormones
>Date: Fri, Apr 30, 1999, 12:06 PM

> At 11:50 AM 4/30/99 -0700, you wrote:
>>Today a student stumped me by asking me why phytochrome is not considered a
>>hormone. Does anyone have an answer?
> Phytochrome acts in the same place where it is activated.  It's not
> a "signal" moving from one part of the plant to another.  Tell the
> student it's the same thing as asking about chlorophyll--chlorophyll
> does mighty potent stuff, but it does it where it was located to
> begin with.  A hormone, by definition, is produced in one place and
> acts in another.
> (bill)
> William K. Purves      Vice President/Editorial Director
> The Mona Group LLC                     West Coast Office
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