next message in archive
no next message in thread
previous message in archive
Index of Subjects
> This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --Boundary_(ID_jI7CEigO3ee5rVlU9RmblQ) Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT 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). --Boundary_(ID_jI7CEigO3ee5rVlU9RmblQ) Content-type: text/html; charset=US-ASCII Content-transfer-encoding: 7BIT <HTML> <HEAD> <TITLE>drought as a factor in fall colours --"For a colourful fall" -- Globe and Mail, Oct. 2, 2007</TITLE> </HEAD> <BODY> <BR> <FONT SIZE="2"><FONT FACE="Arial">Globe and Mail, Oct. 2, 2007<BR> </FONT></FONT> <BR> <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> <BR> </BODY> </HTML> --Boundary_(ID_jI7CEigO3ee5rVlU9RmblQ)--
next message in archive
no next message in thread
previous message in archive
Index of Subjects