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C. Bactia

This is a discussion on C. Bactia within the Cattleyas, Vandas, Dendrobiums IN BLOOM forums, part of the Orchid Photography category; a primary cross of C. bowringiana x C. guttata This is a 4N plant. This ...

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  1. #1
    Ron-NY is offline rothaholic
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    Default C. Bactia

    a primary cross of C. bowringiana x C. guttata This is a 4N plant. This growth is about 2 feet tall.


  2. #2
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    That is a gorgeous Bactia....lucky you!
    Connie

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    Brutal_Dreamer is offline Dreaming with my eyes open...
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    Wonderful! I ave always loved this one.

    Cheers,
    BD

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    Explain again to me what 4N means? something to do with the genetics of the orchid. And if my swiis cheese brain is connecting today, the # of N's affects the fertility of the orchid?

  5. #5
    Ron-NY is offline rothaholic
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    the ploidy ( # of chromosomes in a cell) of a plant is normally 2N (diploid). 4N is tetraploid, indicating twice the # of chromosomes in a cell. This is usually accomplished by treating the seed with colchicine. Chochicine is a mitotic inhibitor that stops a cell from dividing at metaphase (after the chromosomes have been doubled). You will usually get some 4N and some 3N plants as well as some other #'s but those most likely will not survive.

    Tetraploids generally result in even larger blooms, although flower count is reduced. Plant size increases and growth slows down, so seedling to blooming time is increased. The fertility of tetraploids is generally much greater than that of diploids, although crossing them to diploids results in mostly 3N offspring. 3N plants tend to be sterile but have larger flowers and faster growth than 2N
    or 4N plants.

    Crossing a 2N plant by a 4N plant will give you mostly 3N offspring. Crossing 4N x 4N will give you mostly 4N offspring.

    I also have a 2N C. Bactia...see pic below. As you can see the flower segments are narrower.
    Last edited by Ron-NY; August 24th, 2008 at 04:29 PM.

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