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Citrus grafts
In article , P van
Rijckevorsel writes Interesting. Apparently there are some effects by one component of a chimera on the other, but they are not very major or they would be more prominent in the public eye, to say nothing of the literature, grafting being as popular as it is. The following is speculation. Many plants have 3 layers of tissue in the meristem. Lavatera x clementii 'Rosea' is non-chimaeric, and has rose-coloured petals with a rose-red eye. Let us denote the composition of the 3 layers in this cultivar as RRR. Lavatera x clementii 'Barnsley', to the best of my knowledge, is a sport of 'Rosea'. It has flowers that open white, with the same rose-red eye. The flowers turn pink as the age. It is known to be a periclinal chimaera, and also is observed to have a propensity to revert to a rose- flowered state. Let conjecture, for reasons which should become clear, that the composition of the 3 layers is WRR. Lavatera x clementii 'Blushing Bride', to the best of my knowledge, is a sport of 'Barnsley'. The flowers age to a slightly paler pink than 'Barnsley', and it does not have the same tendency to revert. (I've seen one source that says that this variety to not change colour as it ages, but consider the cultivar name, I'm confident that that source is in error.) I conjecture that this is WWR. There are cultivars with similar flowers which don't turn pink with age, which would be WWW. 'Lisanne' is, I believe, a cross between Lavatera thuringiaca 'Ice Cool' (which has pure white flowers, including the eye) and 'Barnsley' - I have been told that it's a sport of 'Barnsley', but the habit differs, and is similar to the supposed seed parent, so I find that explanation more convincing. 'Memories' (aka 'Stelav') also has a compact habit, and may be a similar cross. It may be the case that the aging to pink is an effect of the R genotype on W genotype tissue. Lavatera x clementii 'Candy Floss' ('Cotton Candy' from some US suppliers) has a colour pattern very similar to 'Rosea' (perhaps a fraction paler), but has a herbaceous habit, and differently shaped flowers. It seems to me that this is a similar cross, but with 'Rosea' as the parent instead of 'Barnsley', and perhaps wild-type thuringiaca rather than 'Ice Cool'. -- Stewart Robert Hinsley |
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