Search found 1368 matches

by Karl K
Mon Feb 22, 2021 11:29 am
Forum: Rose Hybridizers Association Forum
Topic: Mycorrhizal Fungi
Replies: 0
Views: 41

Mycorrhizal Fungi

I've been collecting info on mycorrhizal fungi, and came across a very interesting paper that goes far beyond what I thought I needed. New Phytologist 154(2): 275 (May 2002) Coevolution of roots and mycorrhizas of land plants Mark C. Brundrett http://bulbnrose.x10.mx/Heredity/MycorrhizalFungi/Brundr...
by Karl K
Thu Feb 11, 2021 11:39 am
Forum: Rose Hybridizers Association Forum
Topic: Alternate source for repeat bloom
Replies: 41
Views: 4297

Re: Alternate source for repeat bloom

"Musk rose" has long been applied to species other than Rosa moschata of Herrmann. The "musk rose" of Shakespeare is widely thought to have been R. arvensis; R. sempervirens was also associated, as Bauhin's 1623 name of Rosa moschata sempervirens makes clear. The "dark and shining" leaf description...
by Karl K
Thu Feb 11, 2021 11:30 am
Forum: Rose Hybridizers Association Forum
Topic: Alternate source for repeat bloom
Replies: 41
Views: 4297

Re: Alternate source for repeat bloom

Back in 1835, Thomas Willats of London listed Chinas, Noisettes and the 'Lisle de Bourbon'. In addition, he had the following reblooming varieties of other origins. Even granting that there are sports in this list, that's a lot of "flukes" Blush Monthly Crimson Perpetual Flesh-coloured 4 seasons Po...
by Karl K
Wed Feb 03, 2021 10:12 pm
Forum: Rose Hybridizers Association Forum
Topic: Alternate source for repeat bloom
Replies: 41
Views: 4297

Re: Alternate source for repeat bloom

I think it's a mistake to assume that Rosa moschata has KSN_wild. 'Champney's Pink Cluster' (which was the original cross between R. moschata and R. chinensis 'Old Blush'; I wonder... in the paper https://www.nature.com/articles/s41477-018-0166-1/ table 2 says that R. Moschata is "recurrent bloomin...
by Karl K
Wed Jan 27, 2021 5:41 pm
Forum: Rose Hybridizers Association Forum
Topic: Ploid Cross Matix Tool?
Replies: 8
Views: 448

Re: Ploid Cross Matix Tool?

Rowley (1960) wrote "The progeny of triploid roses only very rarely include triploids..." There are exceptions. For example, the original Bourbon was almost certainly a triploid. And triploidy persisted down to 'Souv. de la Malmaison. If the crossings led to a Tea-like plant, it would have been list...
by Karl K
Wed Jan 27, 2021 5:27 pm
Forum: Rose Hybridizers Association Forum
Topic: Ploid Cross Matix Tool?
Replies: 8
Views: 448

Re: Ploid Cross Matix Tool?

https://booksc.org/s/Walter%20Lewis%20Rosa%20foliolosa The Southwestern Naturalist, Vol. 3, No. 1/4 (1958), pp. 145-153 A Monograph of the Genus Rosa in North America. II. R. foliolosa Walter H. Lewis Although the mitotic leaf chromosomes from only one plant were studied in detail, several plates f...
by Karl K
Fri Jan 22, 2021 11:06 pm
Forum: Rose Hybridizers Association Forum
Topic: Ploid Cross Matix Tool?
Replies: 8
Views: 448

Re: Ploid Cross Matix Tool?

Years ago I bought a copy of The Chromosome Atlas by Darlington and Dr. Janaki-Jamal. It is an interesting collection of chromosome count data from a wide range of plants. But when I checked chromosome numbers of plants that Luther Burbank had used in his work, I learned that if he had restricted hi...
by Karl K
Mon Jan 04, 2021 6:12 pm
Forum: Rose Hybridizers Association Forum
Topic: Can Somebody Explain 'Replicative Fading'?
Replies: 9
Views: 558

Re: Can Somebody Explain 'Replicative Fading'?

Though this report deals with humans, the underlying principle may well apply to plants. Therefore, two cuttings from a seedling may become epigenetically distinct, more so the older they become, and even more so when they have been exposed to different environmental histories. In past centuries it ...
by Karl K
Sun Jan 03, 2021 7:51 pm
Forum: Rose Hybridizers Association Forum
Topic: Can Somebody Explain 'Replicative Fading'?
Replies: 9
Views: 558

Re: Can Somebody Explain 'Replicative Fading'?

I remembered that this subject was discussed on rec.gardens.roses back in the '90s. Here's a snippet I found today. Some of the "degradation" described could be the result of poor propagation practices, and might be repaired by careful bud selection ... if anyone wants to make the effort. Also, I ad...
by Karl K
Thu Dec 31, 2020 12:48 am
Forum: Rose Hybridizers Association Forum
Topic: Can Somebody Explain 'Replicative Fading'?
Replies: 9
Views: 558

Re: Can Somebody Explain 'Replicative Fading'?

I have obtained several rose books for a Christmas gift. One of them mentions the concept of 'replicative fading'. I am rather confused as to what this exactly entails. The book used 'Peace' as an example of a rose that has been regarded through reckless duplication via cutting. So, are the cutting...
by Karl K
Mon Dec 14, 2020 7:18 pm
Forum: Rose Hybridizers Association Forum
Topic: Heat vs. Petals
Replies: 0
Views: 458

Heat vs. Petals

A week ago or so I saw some surprising pictures of 'Agnes' (H. Rugosa) bearing pink flowers rather than the usual light amber-yellow. Patricia Routley explained that the flowers opened following a heat wave. She also noted that the flowers had fewer flowers than usual. That rang a bell for me. https...
by Karl K
Sun Dec 06, 2020 8:34 am
Forum: Rose Hybridizers Association Forum
Topic: Rust
Replies: 8
Views: 773

Re: Rust

This seems like a good place to mention older efforts to breed for resistance to fungal infections. http://bulbnrose.x10.mx/Roses/breeding/FishRoseRust1898.html Fish: Orange-fungus on Roses (1898) I have long known that the red-rust seldom or never attacks Teas, Hybrid Teas, Noisettes, Bourbons, Chi...
by Karl K
Sat Dec 05, 2020 6:10 pm
Forum: Rose Hybridizers Association Forum
Topic: Handling cold-hardiness
Replies: 18
Views: 2408

Re: Handling cold-hardiness

Today I happened upon another factor that had not occurred to me. The color of the canes and branches can influence winter hardiness. There is not mystery to it once we set the stage. Suppose the temperature is hovering about freezing. Sun is shining and branches that are black or brown will be abso...
by Karl K
Wed Nov 25, 2020 9:30 am
Forum: Rose Hybridizers Association Forum
Topic: Apples and Oranges
Replies: 30
Views: 3075

Re: Apples and Oranges

It is possible that Rosa foetida did contribute in a useful way with a trait I've been calling "dominant non-red". At the Heritage Rose Garden in San Jose, CA, I saw an alleged "Harison's Yellow' developing a red flush following a heatwave. This occurred in June 2003 and again in June 2006. http://b...
by Karl K
Mon Nov 23, 2020 7:14 pm
Forum: Rose Hybridizers Association Forum
Topic: Apples and Oranges
Replies: 30
Views: 3075

Re: Apples and Oranges

It may be that Rosa foetida is not the only species that contributed to the lilac color of 'Grey Pearl', 'Sterling Silver' and so one. I've been reading about the colors and color patterns of sweet peas. A strain called 'Blue Shift' caught my attention because the blooms start out a purply pink then...
by Karl K
Thu Nov 12, 2020 10:31 pm
Forum: Rose Hybridizers Association Forum
Topic: Splash and Dash equals Bad Technique?
Replies: 36
Views: 1919

Re: Splash and Dash equals Bad Technique?

There are a couple of techniques that might help encourage flowering and hip set. These are Binding and Ringing. Binding involves nothing more than wrapping a strong string or twine around a cane and tie it tight enough to impede the downward movement of carbohydrates, protein and such, while not bl...
by Karl K
Tue Nov 10, 2020 11:55 am
Forum: Rose Hybridizers Association Forum
Topic: Memory stress test
Replies: 7
Views: 589

Re: Memory stress test

Some of the "geneticists" (or fruitfly breeders) seemed to consider organisms to be collections of traits. They held a static view of the subjects, mostly ignoring the developmental processes that made a completed plant or animal from a fertilized egg. This developmental program is too easily ignore...
by Karl K
Tue Nov 10, 2020 11:34 am
Forum: Rose Hybridizers Association Forum
Topic: Memory stress test
Replies: 7
Views: 589

Re: Memory stress test

Researchers Surprised After They Graft Tomato Plants With Epigenetically-Modified Rootstock It might be time to re-examine some facts that were already established in the early 19th century. For instance, William Prince, the once-famous nurseryman of Long Island, NY, reported (1832) an important ob...