[nafex] Dwarf Fruit Stock and GA-3

Dr. Chiranjit Parmar parmarch at vsnl.com
Wed Mar 14 14:12:26 EST 2001

No its not like that.  If those varieties of a plant which are genetically
dwarf are treated with GA, they loose their dwarfness and attain the normal
size.  For example some dwarf strains of annual flowers have been developed
through breeding.  If such types are treated with GA, they will grow to the
normal height.

Dwarfing rootstocks have a different mechanism.  Mostly the graft union
formed as a result of these particular rootstocks creates a sort of barrier.
This hampers normal growth and leads to stunted growth or dwarfing.  GA will
not have any effect here.

Dr. Chiranjit Parmar
Horticultural Consultant on Lesser Known Indian Fruits
----- Original Message -----
From: "Tom Olenio" <tolenio at sentex.net>
To: <nafex at yahoogroups.com>
Sent: Tuesday, March 13, 2001 5:48 PM
Subject: [nafex] Dwarf Fruit Stock and GA-3

> Hello All,
> Just reading up about gibberellic acid, and came across this
> quote rom JL Hudson's web page (
> http://www.jlhudsonseeds.net/GibberellicAcid.htm );
> "GAs control shoot elongation in many plants, and dwarf
> forms of some plants are due to GA deficiencies."
> My question is; are dwarf fruit rootstocks due to GA
> deficiencies, and would the introduction of mycorrhiza fungi
> and the resulting increases in gibberllian-like chemicals
> affect the rootstocks standard dwarfism?
> Thanks for any input you may have.
> Regards,
> Tom
> --
> Thomas Olenio
> Ontario, Canada
> Hardiness Zone 6a
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