cereoid at prodigy.net
Wed Apr 24 19:01:14 EST 2002
The feature to which you allude is called variegation. There are many
possible causes of variegation one of which is chlorosis. However, that does
not appear to be what Zillah is alluding to.
A yellow leaf color can also be attributed to an increased amount of
carotinoid plastid pigments or flavone cell pigments.
Jeremy Harbinson <"Jeremy Harbinson"@users.tbpt.wau.nl> wrote in message
news:3CC6DC3B.AACE6526 at users.tbpt.wau.nl...
> There are many possible explanations for this feature. Virus infections
> cause chlorosis, and some ornamental variegated forms of plants owe their
> to a virus. Nutrient deficiencies are also a cause, iron and manganese
> deficiency will cause chlorosis in plants like Rhododendron that require
> soil but which have been planted on a soil whose pH is too high; other
> deficiencies can also provoke chlorosis though I doubt that you would see
> deficencies on a normal garden soil. Other physiological stresses such as
> light in combination with low temperatures can cause loss of chlorophyll,
> thus chlorosis. Most commonly, though, the golden colour you refer to is
> result of a mutation that causes a low chlorophyll concentration in the
> sometimes this requires bright light to fully manifest itself, and
> is has clear developmental path (eg young leaves green, older leaves
> The causes of this chlorosis are not often understood in terms of the what
> missing gene product does, though is some cases this is known. For example
> some cases the golden colour is associated with severely reduced amounts
> chlorophyll b.
> all the best,
> Jeremy Harbinson
> Zillah wrote:
> > Does anyone know what makes plants go gold? I have a Fatsia which was
> > when small, but is now very golden-green - and makes a very bright
> > in the garden. I know there are many other golden cultivars of other
> > such as Pelargoniums (e.g. Mrs. Quilter) and the Choisya called I think
> > Sundance. Just wondered how they come about initially.
> > Thanks for reading this -
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