Can you answer a question or two?

Bill Purves purves at
Tue Aug 1 23:35:48 EST 1995

In article <3vl65v$qa6 at>,
Nicholas Skelton  <nicksk at> wrote:
>I hope this helps
>It is only off the top of my head
>>exhaust from buses, which will be idling
>next to the garden.  The question is, is there a problem with 
>toxins from the exhaust being taken up by plants, either through 
>the leaves or the roots?
>No not really. There is likely to be more damage caused by wind, soot
>coating the leaves and being run over. 

... and Nick followed with some very good information.  But it should
be noted that the exhaust DOES present at least one problem itself,
namely ethylene.  Ethylene is among the ingredients of automotive
emissions, and it does affect plants.  The "triple response" to
ethylene includes an inhibition of stem elongation, a screwing up
of gravitropic orientation, and a thickening of the stem.


William K. Purves
Department of Biology
Harvey Mudd College
Claremont, CA 91711
Bill_Purves at

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