This topic contains 2 replies, has 3 voices, and was last updated by  sabrina-solskin 1 month, 3 weeks ago.

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  • #25482
     Hannah 
    Participant
    @hannah-hansen
    Topics: 1
    Replies: 6

    The more I read about peony hybridizing the more stupid I feel. So many new questions every day…

    One thing I´ve been thinking about is about the quality of seedlings after a cross by the same parents, but with the difference that in group one you cross seeds from A x pollen from B, but in group two you do the opposite. Seeds from B x pollen from A. I hope you get me? Would you say the quality of the seedlings will be the same in both groups, if you have a fair amount of seedlings in both groups? Or are some great seed parents sometime crappy pollen parents and vice versa?

    Hannah

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  • #25502
     Bob 
    Participant
    @bobjohnson
    Topics: 3
    Replies: 32

    Dear Hanna,

    Sorry that your question sat here for a while unanswered.  I was not paying as much attention as I should have !

    I understand what you mean.  Should we see differences when we do a “reverse cross” ?

    My sense is that theoretically there should be some differences.  I’m not very knowledgeable about genetics, but since no one with more knowledge has answered, here’s my admittedly limited understanding.  Apparently each parent does not contribute an equal amount to each seedling. It’s my understanding that the pod parent contributes some genetic  “maternal DNA”, which the pollen parent does not bring along with it. So in that sense, the pod parent may contribute more to the seedling that the pollen parent does.  What qualities are carried by this extra maternal DNA, and what influence it may have on seedlings I can’t say.  And perhaps my understanding is wrong to begin with.  But I think it’s possible that crosses done in different directions, using the same parents, might be different.

    How one could tell might be hard to observe though, because in my experience, if you grow out 50 seedlings of a cross, there’s naturally  quite a bit of variability. As a result, looking down a row of seedlings, one can often have a hard time trying to guess what sort of parents were involved.  Some parents (like Blushing Princess) seem to make larger plants, and plants involving Old Faithful seem to make seedlings which bloom later in the season.  So it’s likely that when crossing herbaceous varieties, you might not be able to see much difference between crosses that were made in one direction or the other.  While they could be different, natural variability might obscure whatever those differences are.

    Having said that, if the genetic makeup of the two plants are quite different, it might make a difference.  As I understand, there are one or two reverse Itoh crosses, and the plants from those crosses do look different than from crosses made in the normal direction.  Crosses between complex garden varieties and wild species might also produce differing results if done in different directions.

    Again, others are sure to know more about this than I do.

    Bob Johnson

     

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  • #25505
     sabrina-solskin 
    Participant
    @sabrina-solskin
    Topics: 0
    Replies: 5

    Bob is right..its called Reverse cross

    Or ´Cross back `

    But, as i learned by Don Hollingsworth – there is a natural barrier to the parents

    Also it would be good you read, the post in the library..where some early breeders have done it and write about it – Because in the 2 generation of 2 parents.. there is a low fertility.. but we have found that growing them more years.. they get more mature .. so they might be able to make seeds..

    Also you could learn to test the pollen ( also in this articles ) for fertility..as because you see lots of pollen it can be infertile.. and doing crosses with infertile pollen gives nothing.

    Collect your own section of parents .. .make your own crosses.. raise theese – new generations – make selections by the best – choose your goal
    Even it is a small section.. it will give you lessons about.. what to do

    As practicing is the best way to learn

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