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If a plant, say a ficus or a teak, as a sapling were exposed to radiation, and a tree of the same species were present at the same distance, which of the two would be more likely to mutate?

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Aren't they all trees in the end, anyway? –  jonsca Jul 25 '12 at 12:08
    
Either is an ecosystem in itself. –  Everyone Jul 25 '12 at 13:20
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Ionizing radiation is harmful because of damage to genes. It's thus far more damaging, to everything, earlier in the development cycle; down to the point of the very first cell, where relatively small doses of radiation can render the potential organism non-viable (like killing the cell outright). Random mutations all over a tree are unlikely to amount to much –  Ben Brocka Jul 26 '12 at 1:40
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Ben raises a good point about this question actually - @Everyone are you interested in the effect of radiation on a single cell sampled from a large tree (compared to a single cell in a sapling), or on the organisms as a whole? If it is the whole organisms, Ben has the correct answer I believe; mutations (and thus radiation) will be less of a problem to a plant once it is larger, as any cutting of the plant could go on to form a new tree; each individual cell becomes less important. (See biology.stackexchange.com/questions/2055/… out of interest) –  Luke Jul 26 '12 at 16:15
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Depending on what plant/tree is concerned, I could also imagine things like bark absorbing some of the radiation being emitted. –  LanceLafontaine Jul 26 '12 at 20:28
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