Search found 1155 matches

by Karl K
Fri May 24, 2019 1:26 pm
Forum: Rose Hybridizers Association Forum
Topic: Epigenetic Program
Replies: 1
Views: 65

Re: Epigenetic Program

Re: vegetative selection. As I discussed in my last note, the ability to respond to vegetative selection (for good or ill) seems to decline with age. In other cases, some strains and specimens appear to be less responsive than others. Many roses have been hurt by too-rapid propagation without proper...
by Karl K
Tue May 21, 2019 12:06 pm
Forum: Rose Hybridizers Association Forum
Topic: Epigenetic Program
Replies: 1
Views: 65

Epigenetic Program

It has become increasingly apparent in recent decades that there is much to heredity that doesn't fit into the simplistic neo-mendelist model. Dominance, for example, is not a simple matter of presence vs. absence. Often, there is an element of chance involved in deciding which of two alternative ch...
by Karl K
Sat May 18, 2019 5:14 pm
Forum: Rose Hybridizers Association Forum
Topic: Age of fertility
Replies: 2
Views: 53

Re: Age of fertility

I see know reason why the very first blossoms wouldn't have viable pollen. There are cases. Some interspecific hybrids are sterile the first year or two (or longer) before becoming fertile. http://bulbnrose.x10.mx/Heredity/King/DelayedFertility.html And Fagerlind (1958) reported that some of his ro...
by Karl K
Wed May 15, 2019 3:37 pm
Forum: Rose Hybridizers Association Forum
Topic: Sterling Silver
Replies: 15
Views: 481

Re: Sterling Silver

Thanks for this, Karl. Hopefully someone at HMF will add the information on the second parent to the monograph for Sterling Silver. Don, I found two more newspaper articles, but they have the usual weakness: they are newspaper articles. I had a similar problem when I was researching Schoener. It be...
by Karl K
Tue May 14, 2019 9:59 pm
Forum: Rose Hybridizers Association Forum
Topic: Project for large rose hip X R. Pimpinellifolia. Questions..
Replies: 22
Views: 2787

Re: Project for large rose hip X R. Pimpinellifolia. Questions..

Hi Sebastian, Of all the hips I've handled, the only ones that make my mouth water are from Rosa roxburghii. The fragrance suggest something like peach or apricot. Coincidentally, I once pollinated a very double Roxburghii by 'Doorenbos Selection', a reblooming Spinosissima with purple-red flowers a...
by Karl K
Tue May 14, 2019 5:35 pm
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 24
Views: 576

Re: R. davidii

Hi Karl, I just planted palustris scandens. Is this the same as plena??? Tom, I just looked up scandens on HMF. It does look like plena , but I won't express an opinion without seeing them together. The San Jose Heritage garden is not even vaguely swamp-like. It is hot in the summer. The plants are...
by Karl K
Tue May 14, 2019 11:45 am
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 24
Views: 576

Re: R. davidii

found another old picture of the rose purchased as davidii from ForestFarm Slide4.JPG whatever it is, I've been enjoying working with it! :) Tom, I won't try to identify a species from a couple of pictures, but your "davidii" sure looks like the Rosa palustris plena I photographed at the San Jose H...
by Karl K
Mon May 13, 2019 6:41 pm
Forum: Rose Hybridizers Association Forum
Topic: Sterling Silver
Replies: 15
Views: 481

Re: Sterling Silver

roseseek wrote:
Mon May 13, 2019 3:25 pm
Thank you, Karl. Would you please add your article to the References section on HMF? I'll add the parentage quote.
I've been trying to add a few items, including two articles on 'Sterling Silver', but having little success. I just sent a note to the Admin.
by Karl K
Mon May 13, 2019 2:04 pm
Forum: Rose Hybridizers Association Forum
Topic: Sterling Silver
Replies: 15
Views: 481

Re: Sterling Silver

An article by Gladys Fisher I found this morning. Telegraph Delivery Spirit, 23(2): 36 (1956) Hybridizing Roses By Gladys Fisher  Arnold-Fisher Co. Woburn, Mass ROSES, old and new, are the most fascinating flowers in the world,  to write about as well as to work with in hybridizing for new varieties...
by Karl K
Fri May 03, 2019 1:40 pm
Forum: Rose Hybridizers Association Forum
Topic: In Search of BLUE
Replies: 3
Views: 159

Re: In Search of BLUE

It is truly amazing (I think) that blue is such a difficult color to achieve in flowers, but is accomplished just the same in a variety of ways. The 'Heavenly Blue' morning glory is a fine blue. So is the little day flower, Commelina communis , and the even smaller Veronica persica Poiret. Yet these...
by Karl K
Fri May 03, 2019 9:48 am
Forum: Rose Hybridizers Association Forum
Topic: By following what is happening with related plants
Replies: 1
Views: 92

Re: By following what is happening with related plants

A related note, though there is no mention of RNA interference. Plant Mol Biol. 2003 Nov; 53(4): 493-511. Rootstock effects on gene expression patterns in apple tree scions. Jensen PJ, Rytter J, Detwiler EA, Travis JW, McNellis TW Like many fruit trees, apple trees ( Malus pumila ) do not reproduce ...
by Karl K
Mon Apr 29, 2019 1:17 am
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 24
Views: 576

Re: R. davidii

http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242417152 The majority of plants determined as  Rosa virginiana  from the Allegheny and Appalachian mountains (for example, in West Virginia) and from the Midwest (for example, Indiana) are  R. carolina  subsp.  subserrulata . In the eastern...
by Karl K
Sun Apr 28, 2019 9:16 pm
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 24
Views: 576

Re: R. davidii

I have to make a correction to Erlanson's 1934 key to Rosa carolina . She wrote, "Prickles, if present, usually terete." This agree's with Michaux's "acicularibus" (having acicles). However, she neglected to mention the paired, hooked/curved infrastipular prickles. Michaux wrote, "aculeis stipularib...
by Karl K
Sat Apr 27, 2019 4:31 pm
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 24
Views: 576

Re: R. davidii

It is not similar to my supposed R. virginiana, which are in turn nearly indistinguishable from R. carolina (both of those two came from Lawyer Nurseries). Erlanson (1934) published a key to American roses. http://bulbnrose.x10.mx/Roses/breeding/species.htm R. virginiana : Stems stout, much branche...
by Karl K
Sat Apr 27, 2019 12:19 am
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 24
Views: 576

Re: R. davidii

Rosa davidii is reportedly closely allied to R. macrophylla. In fact, it has even been regarded as a variety of that species. Here is a characteristic that should distinguish the two: exserted styles. Rosa davidi  Crép. Bull. Soc. Roy. Bot. Belgique xiii. (1874) 253. Si les styles sont normalement ...
by Karl K
Tue Apr 23, 2019 11:46 am
Forum: Rose Hybridizers Association Forum
Topic: tissue culture
Replies: 7
Views: 165

Re: tissue culture

Before I forget again, Kane (2000) wrote about micropropagation of roses. One comment is particularly interesting (I think). "Many miniature rose cultivars display vigorous growth when established in vitro ; the actual response is highly cultivar dependent." http://bulbnrose.x10.mx/Roses/breeding/Ka...
by Karl K
Mon Apr 22, 2019 8:29 pm
Forum: Rose Hybridizers Association Forum
Topic: tissue culture
Replies: 7
Views: 165

Re: tissue culture

Some plants can be propagated by leaf cuttings, as most gardeners know. It hadn't occurred to me that roses might be among them. Parsons (1847) Some years since, Lecoq, a French cultivator, conceived the idea of endeavoring to propagate roses by the leaf. He gathered some very young leaves of the Be...
by Karl K
Mon Apr 15, 2019 2:24 pm
Forum: Rose Hybridizers Association Forum
Topic: Bellecom x OP
Replies: 7
Views: 175

Re: Bellecom x OP

http://bulbnrose.x10.mx/Roses/breeding/basye/gillette.htm Basye (1985) 65-626 = ((( R. carolina x Hugh Dickson) x OP) x OP) "My record book shows that in 1961 I made a somatic chromosome count of the mother of 65-625 and found it to be 28. Apparently I never got around to making the count for 65-626...
by Karl K
Mon Apr 15, 2019 1:12 am
Forum: Rose Hybridizers Association Forum
Topic: Open pollinated seedlings from F1 carolina X gallica
Replies: 14
Views: 1492

Re: Open pollinated seedlings from F1 carolina X gallica

I bought R. soulieana from Moore, 25 years or so ago. What I got looked more like R. wichuraiana, or something akin to it.
by Karl K
Sat Apr 13, 2019 12:50 pm
Forum: Rose Hybridizers Association Forum
Topic: Is sterility sometimes a physical problem, and not genetic?
Replies: 5
Views: 139

Re: Is sterility sometimes a physical problem, and not genetic?

Years ago I found that 'Blush Noisette' never set hips unless I pollinated the flowers by hand. Those little petals covered the stigmas, and most of the stamens. The excessively double Rosa roxburghii can be pollinated by hand (as I learned by experience) but a bumblebee I once saw visiting such a f...