F1 / F2 hybrids

Christiaan van Schalkwyk cvschalkwyk@lantic.net
Tue, 27 May 2014 01:47:08 PDT
Hi Aad

Despite the scientific uses of the term "F1" and "F2" when working with 
hybrids, I see (and use it) it in a much simpler way.

The "F" stands for "Filial", and Google defines filial as follows:
adjective: *filial*

    relating to or due from a son or daughter.
    "a display of filial affection"
    synonyms: 	dutiful

    befitting a son or daughter, familial
    "a display of filial affection"

    denoting the offspring of a cross.

I simply use it to denote the number of generations away from the 
original plants. F1 is thus generation 1, F2 generation 2, and so on.
For example, I have a pot full of bulbs, which were either bought, dug 
out somewhere, or grown from seeds. This is my "mother stock". Seeds 
collected and grown from these are marked F1. (And even if not a hybrid 
or cultivar, some genetic contraction already occured as I probably used 
the best of the lot as pollen parent and my parent group is small). 
Seeds from this group will the be F2, and so on. If, somewhere along the 
line (say the fith generation), something desirable comes to the front, 
I'll give it a name. It would then be both cultivar so-and-so, and Genus 
spesies F5, at the same time.
So it is not so much about hybrids as it is about generations.

Hope this helps

ps. This is not applicable to plants grown from cuttings or offsets, 
because they are genetically identical to their parent

, On 2014-05-26 10:19 PM, Aad van Beek wrote:
> This is triggered by pbs bx 360 where F2 was mentioned twice
> 7. Hippeastrum neopardinum x H. papilio, F2
> 16. Hippeastrum ‘Giraffe’ F2 x ‘Purple Rain’
> So after reading wikipedia about hybrids a F2 is considered a self pollinated F1 and the offspring is not uniform but having all sorts of variation based on the gene combination from the parents and dominancy of genes.
> But that leads to the more mysterious question when do I get F1 hippeastrum.  So let me give some examples.
> 1. Whenever I cross two species? Doesn't seem to concur with the notion of uniform offspring.
> 2. Whenever I cross the same species but from two separate gene pools most likely caused by geographical distance. So is Hippeastrum papilio F1 possible. To me this sounds strange as I would call the offspring also papilio species.
> 3. Same as 2 but then from neighboring plants, so most likely same gene pool. Still would call the offspring papilio species instead of putting F1 after it.
> 4. Whenever I cross two cultivars. Also like 1 this doesn't concur with notion of uniform offspring.
> So in essence I can't come up with a scenario where the result is a F1. So what do I overlook.
> Can anyone explain what I'm missing.
> Aad
> Holland
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