Re: Color of a rose...
Re: Color of a rose...
- Subject: Re: Color of a rose...
- From: Robin Myers <email@hidden>
- Date: Thu, 4 Jun 2009 05:42:34 -0700
Until looking at the first and third links' abstracts I was unaware of
the betaxanthin fluorescence. Notice too that it took narrow band
laser excitation with confocal microscopy to detect the fluorescence.
It would be nice to read the entire first article to see if the
fluorescence is masked by the rest of the flower's reflectance
spectrum or if it can be detected with natural lighting and visible
light photography. Unfortunately, the server would not respond to
download the entire article. I will try later.
Until the betaxanthins were mentioned, the only fluorescent flowers I
knew of were those produced by genetic modification. It would be
interesting to get a list of those species exhibiting fluorescence,
since by the first article's abstract not all the Caryophyllales
fluoresce.
The second article is only for dessicated herbarium specimens and
relates to the pollen targets some flowers exhibit in the UV. The
pollen targets I have seen in images, and actually photographed, are
increased absorption of UV wavelengths, so they appear darker than the
surrounding petal portions in live specimens rather than fluorescing.
Thanks for bringing this to my attention.
Robin Myers
On Jun 4, 2009, at 2:43 AM, Bob Frost wrote:
To clarify things a bit, there are NO naturally fluorescent
flowers, so that is not the problem.
??
http://www.springerlink.com/content/w121j435k7696717/
http://www.sciencemag.org/cgi/content/abstract/179/4072/486
http://www.highbeam.com/doc/1G1-137455792.html
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T6V-4GHBP7B-5&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=a5e50261423cf9349b3e62b130c20d12
Bob Frost
--------------------------------------------------
From: "Robin Myers" <email@hidden>
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