Return to the Botany Forum | Post a Follow-Up

Thornless berries

Posted by reinbeaux z8 WA State (My Page) on
Tue, Sep 14, 04 at 20:16

Why do thornless berries (ie: thornless boysenberry) revert back to thorned berries when propagated by root cuttings?

Follow-Up Postings:

RE: Thornless berries

Could it be that you have a grafted variety and it is the understock which you actually end up propagating by root cutting ?

RE: Thornless berries

The propagation book I have states this. I have not propagated my boysenberries yet.

I found the answer while looking it up - I guess I missed it before

('Plant Propagation Principles and Practices' --- by Hartmann and Kester - third edition)

Page 191

Periclinical chimera
tissues of one genetic composition over a genetically different 'core'

Rubus has numerous thornless blackberry forms in which the epidermal layer lacks the gene for thorniness. Such plants will usually retain this characteristic if propagated by stem cuttings or by tip layering. In propagating such thornless chimeras by stem cuttings, it is significant that the adventitious roots rise endogenously beneath the mutated tissue, with the result that the root system of such thornless plants is composed entirely of nonmutated cells. If such roots are subsequently used as a source of root cuttings, the resulting plants are thorny. Likewise, seedlings developing from seeds taken from the thornless plant are thorny because the gametes are produced from cells of the tissue which originated from the L-II (nonmutated) layer. Some thornless forms, however, do involve the L-II layer in the mutation, and these transmit the altered characteristics to the seedling offspring.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Botany Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here