Re: Plant Hormones
- To: hosta-open@mallorn.com
- Subject: Re: Plant Hormones
- From: J* H* <h*@gcnet.net>
- Date: Tue, 02 Feb 1999 22:01:07 -0500
- References: <345A1E82.D4@gcnet.net>
Jim Hawes wrote:
>
> The following table represents a Summary of Hormone Characteristics
> which should be attached to reference email Post.
>
> SUMMARY OF HORMONE CHARACTERISTICS
>
> Hormone -Chemistry Function
> -Site of production
> -Mode of transport
> --------------------------------------------------------------------
> Auxin - Indoleacetic Acid (IAA) -Promotes cell elongation,
> -produced in shoot apical organogenesis
> meristem, leaves, seeds -Inhibits growth lateral buds
> -polar movement in -Promotes fruit development
> parenchyma cells -Inhibits leaf abscission
>
> ---------------------------------------------------------------------
> Cytokinin -Zeatin from maize -Promotes cell division
> -structure similar to purines,-Promotes cell differentiation
> adenine in RNA -Promotes organogenesis
> -produced in roots -Promotes lateral buds
> -transported to all -Inhibits leaf abscission
> parts of plant
> ----------------------------------------------------------------------
>
> Gibberillins -Complex chemical structure -Promotes cell div. elongation
> -<70 different forms -Promotes stem elongation
> -produced in stem,roots, -Stimulates flowering in some
> apical meristems plants
> -transported in xylem -Substitutes for vernalization
> to all parts of plant, -Promotes fruit development
> mode of transport un- -Breaks winter dormancy
> known. -Breaks seed dormancy
>
> -----------------------------------------------------------------------
> Ethylene -Colorless gas, odor of -Triggers physiological changes
> ether re maturity
> -produced in nodes,fruit, -Promotes leaf abscission
> senescent tissue
> -transport by diffusion
>
> ---------------------------------------------------------------------
>
> Abscissic Acid -A single compound (ABA) -Inhibits seed germination
> -produced in leaves,
> stems, root cap -Promotes dormancy of buds
> -transported in -Inhibits meristem growth in
> vascular system buds
> -Promotes seed dormancy
> ----------------------------------------------------------------------
> Jim Hawes Oakland MD
> hawesj@gcnet.net
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