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Gibberelin inhibitors

Thomas Bjorkman Thomas_Bjorkman at cornell.edu
Mon Feb 15 09:42:02 EST 1993

In article <1993Feb15.113349.13686 at gserv1.dl.ac.uk> Tony Travis,
ajt at rri.sari.ac.uk writes:
>Is the plant responding to a mechanical stimulus here, or is it eg.
>temperature (from the hands) or damage to the hairs on the surface and
>consequent changes is the thickness of the boundary layer ?
>Or, is it perhaps a chemical transferred from your green fingers ? ;-)

It is the mechanical stimulus.  The most familiar example is probably the
curling of pea tendrils when they contact a support.  However, stems are
also quite sensitive.  Mark Jaffe and Cary Mitchell have been working
quietly on this for decades.  A few years ago Janet Braam was identifying
genes turned on (in Arabidopsis) by spraying various compounds on the
plants. .She found the same genes turning on regardless waht she
sprayed--even water.  It turned out to be the same mechanical stimulus. 
Both the growth response and the mRNA accumulation are fast--a few

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