hort.net Seasonal photo, (c) 2006 Christopher P. Lindsey, All Rights Reserved: do not copy
articles | gallery of plants | blog | tech blog | plant profiles | patents | mailing lists | top stories | links | shorturl service | tom clothier's archive0
Gallery of Plants
Tech Blog
Plant Profiles
Mailing Lists
    Search ALL lists
    Search help
    Subscription info
Top Stories
sHORTurl service
Tom Clothier's Archive
 Top Stories
New Trillium species discovered

Disease could hit Britain's trees hard

Ten of the best snowdrop cultivars

Plant protein database helps identify plant gene functions

Dendroclimatologists record history through trees

Potato beetle could be thwarted through gene manipulation

Hawaii expands coffee farm quarantine

Study explains flower petal loss

RSS story archive

Re: Plant Hormones

  • To: hosta-open@mallorn.com
  • Subject: Re: Plant Hormones
  • From: Jim Hawes <hawesj@gcnet.net>
  • Date: Tue, 02 Feb 1999 21:58:59 -0500
  • References: <3459024B.58F8@gcnet.net> <345A1348.632A@gcnet.net>

I heard Preston Littleton clapping one hand out there. Since it doesn't
take much applause for a ham actor to come back on stage, here is the
write-up on plant hormones. A second post will follow.
> Jim Hawes wrote:
> >
> > There is a subject that we occasionally encounter in our hosta reading
> > or hosta discussions....plant hormones, also called growth  regulators.
> > We think we know or understand what they are and what they do in hosta
> > plants. But do we? I must confess I am often baffled by the role of the
> > various hormones. When considered alone, their roles seem simple but
> > when inter-relationships are studied, hormones are complex indeed.
> >
> > Much is known about them because extensive research has been conducted
> > by literally hundreds of investigators during the last 100 years. Plant
> > hormones are substances which are synthesized in all plants and perform
> > specific functions such as regulation of plant growth and development of
> > entire plants, promotion or inhibition of growth of specific cells,
> > tissues, organs or systems, flowering, fruit and seed production,
> > propagation, dormancy, emergence and other growth phenomena in plants.
> >
> > The natural hormones include auxins, cytokinins, Gibberillins, ethylene
> > and Abscisic Acid. In the next post I will attempt a simple
> > overview summary of each plant hormone before overall questions, answers
> > and comments begin . Conclusions to be drawn on this subject will come
> > at a much later time. I hope that Robins  will have many questions or
> > bits of information to contribute over an extended period of time. Let's
> > try to be open and free in our written email discussions to exchange the
> > vast store of knowledge and experience that has been acquired. Not
> > everyone on the Robin is a scientist but everyone is a gardener who can
> > benefit from more knowledge about plant hormones. So don't delete...YET.
> >
> > First a little history about plant hormones. In 1880, Charles Darwin,
> > the Father of the Theory of Evolution, along with his son Francis, was
> > one of the first to make scientific inquiries into the nature of plant
> > hormones. Working with Canary Grass coleoptiles he found that there was
> > a substance produced in the tips which controlled whether or not the
> > tips bent toward light when present. Some fifty years later, a Dutch
> > physiologist named Went, working with oat coleoptiles and pea epicotyls
> > arrived at similar conclusions, representing the classical research
> > which proved the existence of substances we now know to be auxin type
> > hormones. 
> >
> > Later investigators ( for example, Thimann, working and publishing with
> > Went) identified the naturally produced auxins as Indoleacetic Acid.
> > Since that time other  synthetically produced growth regulating
> > substances (Indolebutyric Acid, Napthalene Acetic Acid,2-4 D Dichloro-
>   phenoxyacetic Acid and others) have been found which have
> > similar characteristics in  promoting or inhibiting growth of plant
>   cells and tissues. Many of these substances are used for facilitating
> > the rooting of cuttings of all kinds. The scientifc literature on this
> > subject is profound but worth investigating to get an appreciation of
> > the quantity of research done to date. Such research is the basis for
> > worldwide efforts in the propagation of hundreds of economic  crops in
> > commercial nurseries of many countries of the world. Hormones play
> > a role in propagation of Hostas, especially in modern tissue culture
> > laboratories.I anticipate that our discussions will cover some aspects
> > of use of hormones in tissue culture propagation, with Robin members
> > having tc experience sharing it with us. I encourage wide participation.
>   Jim Hawes   hawesj@gcnet.net

To sign-off this list, send email to majordomo@mallorn.com with the

 © 1995-2017 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index