You said: "Because it happens in the meristem where each layer probably
a few cells so a dead cell would not n be noticed". It occurs to me that if you
could find dead white cells between the green and gold tissues and photograph
them, you would have proof that mitotic recombination was the cause. Please say
if I am correct in this. While this may take a little time, surely you have the
ability to do this, and it would make your case very nicely.
It occurs to me
that we may have an example of a green-edged gold sport caused by mitotic
recombination right under our noses. The plant 'Striptease' is known for the odd
white tissue between the gold center and the green edge. What is your opinion of
this? Do you think this is the case? Is there any way to determine that this is
the cause, perhaps with an electron microscope? I'm sure that Leiden University
has excellent equipment for you to work with.