Search found 1374 matches

by Karl K
Mon Apr 05, 2021 12:29 pm
Forum: Rose Hybridizers Association Forum
Topic: Magic elixer for creating interspecific crosses
Replies: 6
Views: 783

Re: Magic elixer for creating interspecific crosses

This is not a magic elixir, but it is a point worth mentioning: crossability is often more about specimens than species. Journal of Heredity 51: 13-14 (1960) Male sterility in interspecific hybrids of Solanum Raymond W. Buck, Jr. "During hybridization and cytological investigation of tuber-bearing S...
by Karl K
Wed Mar 24, 2021 2:54 pm
Forum: Rose Hybridizers Association Forum
Topic: Question about crosses with once bloomers
Replies: 14
Views: 1075

Re: Question about crosses with once bloomers

Inheritance of blooming habit can be puzzling. http://bulbnrose.x10.mx/Roses/breeding/VanFleet/VanFleetBabyRambler1907.html A number of cross-bred seedlings, grown from Baby Rambler, are disappointing in that none turns out to be constant-blooming, though largely pollenized with ever-blooming kinds....
by Karl K
Wed Mar 24, 2021 1:46 pm
Forum: Rose Hybridizers Association Forum
Topic: Colchicine induction of ‘Old Blush’ 2n pollen for the hybridization and breeding of tetraploid rose
Replies: 6
Views: 685

Re: Colchicine induction of ‘Old Blush’ 2n pollen for the hybridization and breeding of tetraploid rose

Never forget that colchicine is poisonous to humans as well as to plants. According to the IPCS Inchem entry on Colchicum autumnale : All parts of the plant contain toxins. The greatest concentration of toxins is found in the seeds and the bulb (corm) (Cooper & Johnson, 1984; Frohne & Pfänder, 1983)...
by Karl K
Fri Mar 19, 2021 3:22 pm
Forum: Rose Hybridizers Association Forum
Topic: Rooted Cuttings Failure Question?
Replies: 36
Views: 3923

Re: Rooted Cuttings Failure Question?

Thanks. It's good to find confirmation.

In addition, for the REALLY stubborn types, here's another approach.
Huang: Rejuvenating Sequoia sempervirens by repeated grafting (1992)
http://bulbnrose.x10.mx/Heredity/HuangRejuvSeq1992.html
by Karl K
Thu Mar 18, 2021 12:10 pm
Forum: Rose Hybridizers Association Forum
Topic: Colchicine induction of ‘Old Blush’ 2n pollen for the hybridization and breeding of tetraploid rose
Replies: 6
Views: 685

Re: Colchicine induction of ‘Old Blush’ 2n pollen for the hybridization and breeding of tetraploid rose

Colchicine, and probably other substances, sometimes do not work as neatly as we may suppose. For example, Traub (typed manuscript) injected colchicine into the old daylily clone 'Europa' (3x). This resulted in yellow-flowered sports in a clone that has been remarkable unwilling to mutate in any way...
by Karl K
Thu Mar 18, 2021 11:51 am
Forum: Rose Hybridizers Association Forum
Topic: Rooted Cuttings Failure Question?
Replies: 36
Views: 3923

Re: Rooted Cuttings Failure Question?

For future reference, here are a couple of techniques for rooting difficult plants. Both seem to work with a wide variety of plants. Etiolation and Banding When plants are forced to grow in darkness, may changes occur. Some are externally obvious, others are internal. Fortunately for us, etiolated t...
by Karl K
Mon Feb 22, 2021 11:29 am
Forum: Rose Hybridizers Association Forum
Topic: Mycorrhizal Fungi
Replies: 0
Views: 408

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: 5163

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: 5163

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: 5163

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: 718

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: 718

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: 718

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: 770

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: 770

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: 770

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: 662

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: 1002

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: 2669

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...