Search found 1215 matches

by Karl K
Wed Sep 18, 2019 7:22 pm
Forum: Rose Hybridizers Association Forum
Topic: Environment and gene expression
Replies: 3
Views: 97

Re: Environment and gene expression

pH can alter color of the pigments, but in the cases that I'm puzzling over, a pigment (peonin) was apparently produced by R. foetida bicolor growing in Switzerland, but not in Canada. The difference between cyanidin-3-glycoside and peonidin-3-glycoside is a single methyl group, as this image shows....
by Karl K
Tue Sep 17, 2019 2:36 pm
Forum: Rose Hybridizers Association Forum
Topic: Environment and gene expression
Replies: 3
Views: 97

Environment and gene expression

There are many cases where gene expression is altered by environmental conditions. Siamese cats, for example, are fully pigmented only on those parts of the body that are significantly cooler than core body temperature. At the opposite extreme, wingless fruitflies have an annoying habit of flying aw...
by Karl K
Mon Sep 16, 2019 11:37 pm
Forum: Rose Hybridizers Association Forum
Topic: Use of Rosa blanda/woodsii in breeding
Replies: 28
Views: 3159

Re: Use of Rosa blanda/woodsii in breeding

And isn't R. woodsii more tolerant of alkaline soil than R. blanda ? I checked again. Apparently R. woodsii ranges from acidic soils to somewhat alkaline, and damp to dry. I don't know whether there are especially alkaline-tolerant selections like there are in R. blanda. http://bulbnrose.x10.mx/Ros...
by Karl K
Sat Sep 14, 2019 2:25 pm
Forum: Rose Hybridizers Association Forum
Topic: Use of Rosa blanda/woodsii in breeding
Replies: 28
Views: 3159

Re: Use of Rosa blanda/woodsii in breeding

Looks like Rosa woodsii has a lot of geographical adaptation to share if one could collect an assortment. There's a lot more going on than just color variations and doubling. New Phytol. 37: 72-81. 1938 PHYLOGENY AND POLYPLOIDY IN ROSA EILEEN W. ERLANSON, D.Sc. p. 75 The greatest geographical range ...
by Karl K
Sat Sep 14, 2019 12:59 pm
Forum: Rose Hybridizers Association Forum
Topic: Architectural Components of Compact Growth Habits in Diploid Roses
Replies: 1
Views: 47

Re: Architectural Components of Compact Growth Habits in Diploid Roses

It is interesting to compare these considerations with Webber's report of 1912 on pepper hybrids. "In no case which has come under the writer's observation has a more striking instance appeared of the apparent origination of a new character by hybridization than is found in the giant and dwarf types...
by Karl K
Fri Sep 13, 2019 11:42 am
Forum: Rose Hybridizers Association Forum
Topic: Use of Rosa blanda/woodsii in breeding
Replies: 28
Views: 3159

Re: Use of Rosa blanda/woodsii in breeding

For the record, I don't have a lot of confidence in species labeling. There is so much variation within a species, potential intercrossing, and when a nursery gets involved mistakes happen and inaccuracies are compounded. Gordon Rowley discussed this problem back in 1951. "Sometimes it is even poss...
by Karl K
Thu Sep 12, 2019 1:08 pm
Forum: Rose Hybridizers Association Forum
Topic: An interesting grafting tool...(?)
Replies: 2
Views: 121

Re: An interesting grafting tool...(?)

This does look like a useful tool for beginners, but I wonder how easy it is to sterilize the cutters. RRD seems to be spreading, in some cases, because folks tending public gardens aren't sterilizing their pruners. I saw one garden where RRD was rampant, but some of the roses growing around the fen...
by Karl K
Thu Sep 12, 2019 1:02 pm
Forum: Rose Hybridizers Association Forum
Topic: Use of Rosa blanda/woodsii in breeding
Replies: 28
Views: 3159

Re: Use of Rosa blanda/woodsii in breeding

Just a random observation from seedlings grown from Sheffield seeds. It's easy to distinguish which is which without seeing the label, woodsii seedlings have much bluer foliage where blanda are mid green. Blanda seedlings also seem more prone to dying....which may or may not explain why there doesn...
by Karl K
Thu Sep 12, 2019 12:00 am
Forum: Rose Hybridizers Association Forum
Topic: Samuel-Darragh-Mcgredy-iv 1932-2019 died
Replies: 3
Views: 170

Re: Samuel-Darragh-Mcgredy-iv 1932-2019 died

There was another note I've tried to find, but can't.The subject had turned to gene-splicing. Some guy led us to believe that a blue rose would be coming out just any minute ... that was back about 1996 or 1997. Sam chimed in that anyone who tried to gene-splice one of the patented McGredy roses sho...
by Karl K
Wed Sep 11, 2019 11:52 pm
Forum: Rose Hybridizers Association Forum
Topic: Should one experiment using spermidine?
Replies: 1
Views: 76

Re: Should one experiment using spermidine?

If anyone is interested in this subject, here's another related item:
Polyamines in Paul's Scarlet rose suspension cultures.
https://www.ncbi.nlm.nih.gov/pubmed/24408645
by Karl K
Wed Sep 11, 2019 12:13 pm
Forum: Rose Hybridizers Association Forum
Topic: Something interesting...
Replies: 6
Views: 199

Re: Something interesting...

Kim,
The same breeder introduced the darker colored 'Lightning Strike' rose.
[Good Luck x Art Nouveau]
https://www.helpmefind.com/rose/l.php?l=2.75719
by Karl K
Fri Aug 30, 2019 2:01 am
Forum: Rose Hybridizers Association Forum
Topic: Samuel-Darragh-Mcgredy-iv 1932-2019 died
Replies: 3
Views: 170

Re: Samuel-Darragh-Mcgredy-iv 1932-2019 died

I never met Sam, though I read some of his notes on Rec.gardens.roses back in the mid-1990s. Looking for a specific note (but not finding it) I got this one from 10/19/96 instead, discussing the rose 'Hector Deane', which hints at his humor. Hector Deane was our family surgeon. He took out my tonsil...
by Karl K
Fri Aug 30, 2019 1:55 am
Forum: Rose Hybridizers Association Forum
Topic: Prairie Sweetheart «Sport»?
Replies: 7
Views: 347

Re: Prairie Sweetheart «Sport»?

Propagating patented plants is technically illegal, but the patent owner is responsible for prosecuting. No Patent Police, as far as I know. Besides, you must propagate your sport, just to be sure it is stable. Oh, and looking through the old Rec.gardens.roses archives I came across this item. rec.g...
by Karl K
Sun Aug 25, 2019 1:28 am
Forum: Rose Hybridizers Association Forum
Topic: Non-fading suggestions
Replies: 11
Views: 433

Re: Non-fading suggestions

Sadly, this same 3-GT is responsible for the faint purplish flush that dulls the color of 'Margo Koster' in the summer months. I think I got that bit wrong. I checked my pics and found this one that shows two-toned color that suggests the heat/light sensitive form of 3-GT is working with pelargonid...
by Karl K
Wed Aug 21, 2019 12:47 am
Forum: Rose Hybridizers Association Forum
Topic: Putting honey on stigmas before pollination??
Replies: 12
Views: 590

Re: Putting honey on stigmas before pollination??

In another thread I linked to several articles dealing with supplements to pollination. Among other things, sucrose, calcium, boron and alterations of pH. In one case, the authors chose three seed parents with stigma exudate of pH 3, and three others with pH 8. I think we may assume that some specie...
by Karl K
Wed Aug 21, 2019 12:38 am
Forum: Rose Hybridizers Association Forum
Topic: Agnes as parent?
Replies: 7
Views: 201

Re: Agnes as parent?

Duane,
I haven't seen 'Agnes' for nearly 40 years, though I remember it fondly. I have no experience with it. I just wanted to mention that the "float test" that is sometimes used to test seeds does not (I've read) apply to Rugosas.

I vote "Go for it", and good luck to you in your efforts.
by Karl K
Thu Aug 15, 2019 11:39 am
Forum: Rose Hybridizers Association Forum
Topic: Can any give suggestions on these roses for breeding?
Replies: 10
Views: 183

Re: Can any give suggestions on these roses for breeding?

If mildew and black spot are issues, neither. And ain't that a shame. I first saw 'Oklahoma' and 'Mr. Lincoln' in Kansas more than 40 years ago. Since then I've seen them in California, Kentucky, Oklahoma and Tennessee. Sad to say, 'Oklahoma' was not splendid at Will Rogers park in Oklahoma City. R...
by Karl K
Thu Aug 15, 2019 11:23 am
Forum: Rose Hybridizers Association Forum
Topic: genes and flower color (technical)
Replies: 3
Views: 116

Re: genes and flower color (technical)

While thinking about the flavonoid pigments, I was reminded of an interesting tidbit about the a role of pelargonidin in human health. Tsuda T. Mechanism for the peroxynitrite scavenging activity by anthocyanins. FEBS Lett 2000 Nov 10;484(3):207-10. Pel can protect tyrosine from undergoing nitration...
by Karl K
Wed Aug 14, 2019 2:01 pm
Forum: Rose Hybridizers Association Forum
Topic: How to know how many plants I need for breeding?
Replies: 13
Views: 202

Re: How to know how many plants I need for breeding?

Michurin had a similar problem with 'Persian Yellow'. "As for those cases when it is required for the purpose of crossing the pollen of varieties of R. lutea and especially Persian Yellow, I managed to find an easy way to make the anthers give it. To do this, you only need to take off half-opened fl...
by Karl K
Wed Aug 14, 2019 1:16 am
Forum: Rose Hybridizers Association Forum
Topic: How to know how many plants I need for breeding?
Replies: 13
Views: 202

Re: How to know how many plants I need for breeding?

John Cook was a prominent rose breeder a century ago. His 'Radiance' was once the most popular rose in the U.S. He warned us not to skimp on the pollen. Cook: Rose Hybridization (1905) As the pollen sometimes is very scarce, it is better to put it only on two, or three pistils, repeating the operati...