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Re: Plant Hormones


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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