Search found 1201 matches

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: 531

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: 1
Views: 67

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: 145

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: 76

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: 174

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: 174

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...
by Karl K
Wed Aug 14, 2019 12:48 am
Forum: Rose Hybridizers Association Forum
Topic: Can any give suggestions on these roses for breeding?
Replies: 10
Views: 145

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

Only three of the first generation offspring from Oklahoma came from it as seed parent. Herb Swim wrote how Mr. Lincoln, one of Oklahoma's siblings, was a bad seed germinator. Perhaps that issue extends to Oklahoma? Looks like 'Papa Meilland', third sibling of the same parentage, is also more succe...
by Karl K
Tue Aug 13, 2019 9:47 pm
Forum: Rose Hybridizers Association Forum
Topic: How to know how many plants I need for breeding?
Replies: 13
Views: 174

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

Repeat pollination can increase the number of hips set, as well as the number of achenes per hip. de Vries, et al. (1983) 25 flowers, pollinated once, gave 12 hips averaging 8.6 achenes per hip. (103 total) 25 flowers, pollinated five times at 24 hour intervals, gave 23 hips averaging 16.9 per hip. ...
by Karl K
Tue Aug 13, 2019 11:50 am
Forum: Rose Hybridizers Association Forum
Topic: genes and flower color (technical)
Replies: 3
Views: 76

Re: genes and flower color (technical)

"These findings indicate that these genes may be involved in the flower color difference in the rose mutants, and competition between anthocyanin and flavonol biosynthesis is a primary cause of flower color variation, with its regulation reflected by transcriptional and secondary metabolite levels....
by Karl K
Tue Aug 13, 2019 11:34 am
Forum: Rose Hybridizers Association Forum
Topic: genes and flower color (technical)
Replies: 3
Views: 76

Re: genes and flower color (technical)

This is an interesting topic that needs more consideration, even by amateur breeders. For instance, I recently came across this item: Shisa, M. & Takano, T. The effects of temperature and light on the colour of rose flowers. J. Jap. Hort. Soc. 33: 140-146. 1964. The formation of red pigments in the ...
by Karl K
Fri Aug 09, 2019 11:22 am
Forum: Rose Hybridizers Association Forum
Topic: I'm new here, so I'd like to say hi!
Replies: 21
Views: 559

Re: I'm new here, so I'd like to say hi!

Atlas of Woody Plants in China: Distribution and Climate, Volume 1, is a useful book (online) that gives the geographical distribution of Chinese plants. Genus Rosa begins on page 551. https://books.google.com/books?id=rXTGyOlDjdoC&lpg=PA556&ots=SKHN9_JXC6&dq=rosa%20fargesiana&pg=PA551#v=onepage&q&f...
by Karl K
Thu Aug 08, 2019 8:09 pm
Forum: Rose Hybridizers Association Forum
Topic: I'm new here, so I'd like to say hi!
Replies: 21
Views: 559

Re: I'm new here, so I'd like to say hi!

I know that, for example, the early modern roses (and the hybrid perpetual that came before them) are hard to trace their ancestry. If there was a lot of misinformation and inconsistency with names and origins, that would explain a lot of that! Josh Some breeders just couldn't be bothered to record...
by Karl K
Thu Aug 08, 2019 2:27 pm
Forum: Rose Hybridizers Association Forum
Topic: Non-fading suggestions
Replies: 6
Views: 294

Re: Non-fading suggestions

This is slightly off-topic, but I found a couple of articles dealing with the inheritance of orange (pelargonidin derivatives) in crosses with yellow varieties. de Vries: Flavonoids in rose petals (1974) http://bulbnrose.x10.mx/Roses/breeding/deVriesTable1974.html de Vries: Rose pigments II (1980) h...
by Karl K
Thu Aug 08, 2019 1:32 pm
Forum: Rose Hybridizers Association Forum
Topic: Is this color prediction chart accurate (or useful)?
Replies: 9
Views: 276

Re: Is this color prediction chart accurate (or useful)?

For example, the Modern Rose database on the ARS website often states only two roses for a cross (i.e. Rose A x Rose B), but Help Me Find states that a specific rose is actually something like "Rose A x (Rose B x Rose C). Josh Josh, The one that really threw me was the old habit (19th and early 20t...
by Karl K
Tue Aug 06, 2019 11:44 am
Forum: Rose Hybridizers Association Forum
Topic: Show and Tell?
Replies: 15
Views: 550

Re: Show and Tell?

This spring I found a vial of pollen that had been frozen from last year and decided to look at it under a microscope. Voila, I saw some healthy-looking oval pollen grains. This got me thinking about something I read long ago about microscopes. I thought it involved Leeuwenhoek, but it was actually...
by Karl K
Tue Aug 06, 2019 11:17 am
Forum: Rose Hybridizers Association Forum
Topic: Is this color prediction chart accurate (or useful)?
Replies: 9
Views: 276

Re: Is this color prediction chart accurate (or useful)?

I mean the chart was 2% yellow from pink x pink, wouldn't count on seeing that though as it's likely highly dependent on cultivars used. Definitely true. And another fact worth noting is that Modern Roses 5 contains only roses that have been introduced, which must bias the results. Crossing pink x ...
by Karl K
Mon Aug 05, 2019 4:36 pm
Forum: Rose Hybridizers Association Forum
Topic: I'm new here, so I'd like to say hi!
Replies: 21
Views: 559

Re: I'm new here, so I'd like to say hi!

I've been trying to read up on as much rose history as possible, and somehow I never came across the notion that there were more than 4 Chinas used (the Stud Chinas). Josh, The early 19th century was a strange and exciting period. Trade with the far East was expanding, and many people would receive...
by Karl K
Sun Aug 04, 2019 7:48 pm
Forum: Rose Hybridizers Association Forum
Topic: I'm new here, so I'd like to say hi!
Replies: 21
Views: 559

Re: I'm new here, so I'd like to say hi!

Ah, yes! I couldn't tell if you were talking about the 4 Chinas or Chinese species roses that some of the other posters referred to. First off, there were more than four. And I think it is unreasonable to assume that these four, and the several others, are all of the same one or two species. The ar...
by Karl K
Sat Aug 03, 2019 11:44 pm
Forum: Rose Hybridizers Association Forum
Topic: Show and Tell?
Replies: 15
Views: 550

Re: Show and Tell?

Ploidy can be a bit of a challenge when you're just starting out. It's bad enough when two diploids give sterile (mostly) hybrids because their chromosomes just don't line up properly. 'Max Graf', from R. wichuraiana and a Rugosa gives very little pollen. And the plants I've seen raised from it (asi...
by Karl K
Fri Aug 02, 2019 7:44 pm
Forum: Rose Hybridizers Association Forum
Topic: I'm new here, so I'd like to say hi!
Replies: 21
Views: 559

Re: I'm new here, so I'd like to say hi!

Josh, If you happen across any of the surviving "traditional" Chinese roses, give them a close look because they might be useful for breeding. Never mind that some of the old ones are a bit delicate, in part due to inbreeding. Crossed with stronger garden varieties, they may have hidden treasures le...