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[EarthNSky <erthnsky AT bellsouth.net>]

http://www.unexplained-mysteries.com/forum/index.php?showtopic=772
That page/board  talks a bit about the study.

I think, on this topic, we have to be very careful about assigning human 
terms like 'scream' to a plant or even some animals.  An accoustical 
instrument must be able to record the sound and just because it sounds 
like a scream to our ears, doesn't mean it is a scream.  We often assume 
scream means fear or pain, but maybe not, so we have to be very 
careful...I can scream across the pasture at my neighbor on his tractor 
to communicate with him, but that doesn't mean I have fear or pain.  I 
could also scream with joy or surprise...
Anyway here are some additional stories on the weird and wonderful 
complexity of plants...

http://www.npr.org/templates/story/story.php?storyId=6160709

http://en.wikipedia.org/wiki/Primary_perception
(read down to the paragraph that begins "the notion that"..grrr)

http://www.primaryperception.com/bio/
some links and blogs there

For those who want more indepth analysis:
The JBC
http://www.jbiocommunication.org/

I saw several references to what you were talking about as far as plants 
reacting to an adjacent plants 'murder' and to the 'murderer' but none 
listed a source. Sorry.. perhaps someone else will find it.

Bev


--
"The nine most terrifying words in the English language are: 'I'm from 
the government and I'm here to help.'"  Ronald Reagan