[NatureNS] drought as a factor in fall colours --"For a colourful fall" -- Globe

Date: Wed, 10 Oct 2007 21:41:07 -0300
From: Jim Wolford <jimwolford@eastlink.ca>
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Globe and Mail, Oct. 2, 2007
 
SOCIAL STUDIES
MICHAEL KESTERTON (compiler)

For a colourful fall

In many drought-stricken regions this year, connoisseurs of fall colours
will enjoy a bright display of leaves. Cool - but not freezing - nights
help. But, according to Marc Abrams, a forest physiologist with Pennsylvania
State University, nothing beats a nice dry spell for inducing the green to
get out of the way. The leaves' water content is reduced; other colours
become more concentrated. Drought also stimulates the production of the
pigment anthocyanin - the source of those rich reds, produced exclusively in
fall. Anthocyanins, which trees produce when stressed, appear to combine a
natural antifreeze and sunscreen (for the leaves) and preservative (for the
whole tree). 



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<TITLE>drought as a factor in fall colours --&quot;For a colourful fall&quot; -- Globe and Mail, Oct. 2, 2007</TITLE>
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<FONT SIZE="2"><FONT FACE="Arial">Globe and Mail, Oct. 2, 2007<BR>
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<H2>SOCIAL STUDIES<BR>
</H2>MICHAEL KESTERTON (compiler)<BR>
<BR>
For a colourful fall<BR>
 <BR>
In many drought-stricken regions this year, connoisseurs of fall colours will enjoy a bright display of leaves. Cool - but not freezing - nights help. But, according to Marc Abrams, a forest physiologist with Pennsylvania State University, nothing beats a nice dry spell for inducing the green to get out of the way. The leaves' water content is reduced; other colours become more concentrated. Drought also stimulates the production of the pigment anthocyanin - the source of those rich reds, produced exclusively in fall. Anthocyanins, which trees produce when stressed, appear to combine a natural antifreeze and sunscreen (for the leaves) and preservative (for the whole tree). <BR>
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