Re: sports
Ben,
If green to variegated is a mutation, we still have a problem. Natural
mutation occurs in the range of 1 in a million individuals. I see green to
variegated in numbers closer to 1 in 10,000. Such sports are quite common
in the laboratory. Why do Hosta mutate so easily? I think that Joe must be
asking the same question.
It is also true that some varieties variegate more easily than others. But,
I have the feeling that if I culture a Hosta long enough, it will variegate.
I thought that H. Invincible would never variegate but I have now seen a
streaked plant (not going to be attractive I am afraid). By the way, I do
not mean to imply that TC is inducing mutations, just that I readily see
large numbers of plants.
Jim Anderson
-----Original Message-----
From: B.J.M.Zonneveld <zonneveld@rulbim.LeidenUniv.nl>
To: hosta-open@mallorn.com <hosta-open@mallorn.com>
Date: Saturday, August 14, 1999 8:19 AM
Subject: sports
Joe
Sports can arise different ways
1.green changing to variegated it is a sport due to a mutation
2.yellow changing to variegated it is a sport due to mititic
recombination ( the same is true for blue changing to green)
3.variegation changing to another variegation or to green or to
yellow is a sport due to chimeral rearrangment
4 there are other more rare possibilities
I agree there are big differences between species but also between different
cultivars in the frequency of mutation. If you tc a green one what
is the frequency of mutation? Even in hosta this is low, I suppose.
Can you give any example of plants that give 75-100% sports that are not
due to chimeral rearraggements?
Ben Zonneveld, Leiden University, Dep Genetics
pobox 9505, 2300 RA Leiden, The Netherlands
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