Spiral Thorn Pattern

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Spiral Thorn Pattern

Postby jbergeson » Fri Mar 31, 2017 9:21 am

Have you seen anything like this? A band of thick, fine thorns moves up the stem in a candy cane pattern.

I think this seedling is [Orangeade x R. nitida] x Prairie Joy.
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Re: Spiral Thorn Pattern

Postby david zlesak » Fri Mar 31, 2017 9:35 am

Wow, that is really interesting!!!
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Re: Spiral Thorn Pattern

Postby david mears » Fri Mar 31, 2017 3:29 pm

Hi Joe, from what I can see it is on the whole plant, is that right. How amazing, next trick is to see how the flower comes out, well done Joe.
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in Australia.[/color]
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Re: Spiral Thorn Pattern

Postby philip_la » Fri Mar 31, 2017 6:05 pm

It would be interesting to know if that is a chimera. I wonder for instance if micropropagated tissue from the one side would be thornless. Regardless, a fascinating visual demonstration of the spiraling growth pattern I think.
Philip F.
[size=small][color=#669966]Zone 8 / Sunset Zn 30 (Austin, TX -- formerly New Orleans, LA)[/color][/size]
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Re: Spiral Thorn Pattern

Postby philip_la » Fri Mar 31, 2017 6:07 pm

Joe, am I correct in seeing that all of the nodes/buds are in the "clean" area, and not amid the spines?
Philip F.
[size=small][color=#669966]Zone 8 / Sunset Zn 30 (Austin, TX -- formerly New Orleans, LA)[/color][/size]
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Re: Spiral Thorn Pattern

Postby dgermeys » Fri Mar 31, 2017 6:36 pm

interesting!
Dane from Belgium
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Re: Spiral Thorn Pattern

Postby jriekstins » Fri Mar 31, 2017 7:53 pm

That is so weirdly wonderful--never have seen anything close to that in a rose!!
]Jackie, SoCal., zone 9b,coastal foothills
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Re: Spiral Thorn Pattern

Postby jbergeson » Sat Apr 01, 2017 12:20 am

Philip - you are correct that the nodes/buds appear to be in the non-thorny "clean" area.

David Mears - I didn't spend a whole lot of time examining the plant, but I observed that this spiral growth seems to be only in canes of intermediate age and size. The younger/smaller twigs seem to have only widely spaced thorns and also most of the old wood, although in the pic it seems like there might be some of the pattern on one of the old canes. But maybe I misunderstood your question - yes, it is happening all over the plant in last year's canes of this size. There are more canes out of the frame that have the same pattern.
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Re: Spiral Thorn Pattern

Postby david mears » Sat Apr 01, 2017 4:08 am

Joe, no misunderstanding, just my wierd thinking, "how might the flower come out ?
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Re: Spiral Thorn Pattern

Postby philip_la » Mon Apr 03, 2017 2:00 am

It strikes me that you have a beautiful graphic illustration of the spiral phyllotaxy of a rose, and how it relates to the rest of the stem's growth. (pentastichous phyllotaxy?)
http://www.biologydiscussion.com/leaf/p ... taxy/13243
I suppose that pattern exists on the stem in other roses, but wouldn't be so self-evident. I wonder what caused the segregation of thorns and non-thorns. It will be interesting to see if the twigs developing from the nodes on the smooth face will bear thorns.
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