Search found 1826 matches

by Don
Wed Nov 13, 2019 7:28 pm
Forum: Rose Hybridizers Association Forum
Topic: tissue culture
Replies: 9
Views: 349

Re: tissue culture

>> This has been in an issue on late season cuttings This one's easier than tissue culture. What's needed is indole butryic acid, IBA, at the highest concentration sold. In regard to rooting Sericia Andy at Tillotson's once told me that splitting the stem lengthwise a few inches and then dipping it ...
by Don
Wed Nov 06, 2019 10:29 pm
Forum: Rose Hybridizers Association Forum
Topic: a roadmap for rose research in the genome era
Replies: 1
Views: 40

Re: a roadmap for rose research in the genome era

Thanks for this, Dr. Kuska. This paper has a comprehensive discussion of all the possible traits that rose breeders are wanting to manipulate. It describes what is currently known about the genetic control of each of these traits. IF you are a serious breeder this is a must-read, even if you have to...
by Don
Thu Oct 31, 2019 7:56 pm
Forum: Rose Hybridizers Association Forum
Topic: Breeding with R. nitida (video)
Replies: 4
Views: 109

Re: Breeding with R. nitida (video)

Four thumbs up, Joe!
by Don
Fri Oct 11, 2019 4:27 pm
Forum: Rose Hybridizers Association Forum
Topic: Newbie question
Replies: 12
Views: 542

Re: Newbie question

There is some truth to this but in practice it is one of many factors that influence germination. I would not rush to harvest my hips based on this assumption that earlier means better germination. If you want a general rule for harvest then, say, 106 days after pollination would be a better metric ...
by Don
Mon Oct 07, 2019 12:30 am
Forum: Rose Hybridizers Association Forum
Topic: Rose replant disease?
Replies: 13
Views: 403

Re: Rose replant disease?

>> l was shocked and dismayed to see at Chelsea 2018 R. Rugosa is classified as a invasive species.

It's not just England but New England as well. Rugosa is classified as invasive in Connecticut, as is multiflora. Norwegian Maple is on the Connecticut list as well, along with Russian Olive.
by Don
Mon Oct 07, 2019 12:18 am
Forum: Rose Hybridizers Association Forum
Topic: Golden Gate by Kordes
Replies: 3
Views: 292

Re: Golden Gate by Kordes

Did I sleep through an alien invasion that united mankind? At the bottom of the Kordes website are listed Our Brands which include Star, Drift and Knockout which were all Meilland brands last I knew and, in fact, these are listed on the Meilland site as well - though not Kordes. Kordes IS listed on ...
by Don
Sun Oct 06, 2019 8:14 pm
Forum: Rose Hybridizers Association Forum
Topic: Late breaking California rose rosette virus proposed action
Replies: 3
Views: 185

Re: Late breaking California rose rosette virus proposed action

According to this page the proposed "C" rating will do little more than acknowledge the existence of RRD as a pest but there's enough room in the regulations to allow for discretionary mandated eradication efforts: "C" - Organism subject to no state enforced action outside of nurseries except to ret...
by Don
Sat Sep 28, 2019 11:26 am
Forum: Rose Hybridizers Association Forum
Topic: What Do we know about Black Spot in Roses?
Replies: 1
Views: 121

Re: What Do we know about Black Spot in Roses?

If intentional, the title is a clever play on an earlier paper by another German author named Volker Wissemann titled Beauty and the Bastards which covered evolution of, primarily, canina and the co-evolution of parasitic fungii and insects as driven by reticulation.
by Don
Fri Sep 27, 2019 11:04 pm
Forum: Rose Hybridizers Association Forum
Topic: Environment and gene expression
Replies: 18
Views: 640

Re: Environment and gene expression

I recall Tropicana had a novel pigment or pathway for pelargonidin for a rose though I don't offhand remember the particulars. Do you have anything on it? I think Eugster mentioned it maybe. A neighbor of mine grows tropical hibiscusesii in his window. A couple years ago I used the pollen both ways ...
by Don
Fri Sep 27, 2019 8:15 pm
Forum: Rose Hybridizers Association Forum
Topic: Environment and gene expression
Replies: 18
Views: 640

Re: Environment and gene expression

I have not read the petunia work but yours is a great synopsis. With Suntory it was supposedly vacuolar pH that gave them the mauve rather than blue. They were experimenting with the rosacyanins as well. It is evident that the technology is not the obstacle. Nobody wants to invest in expensive gambl...
by Don
Wed Sep 25, 2019 10:25 am
Forum: Rose Hybridizers Association Forum
Topic: Environment and gene expression
Replies: 18
Views: 640

Re: Environment and gene expression

Suntory has been working on genetically modifying these pathways for decades but I haven't seen much in the way of publications or products. Perhaps someone with access to primary literature can poke around to see if there has been anything new published. https://www.suntory.com/sic/research/s_bluer...
by Don
Mon Aug 26, 2019 10:49 pm
Forum: Rose Hybridizers Association Forum
Topic: Samuel-Darragh-Mcgredy-iv 1932-2019 died
Replies: 3
Views: 253

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

Thanks for this, Henry.
by Don
Fri Aug 23, 2019 8:12 pm
Forum: Rose Hybridizers Association Forum
Topic: Grid for pollen measurement
Replies: 14
Views: 480

Re: Grid for pollen measurement

There are plenty of protocols for germinating pollen most of which are similar to the one in this linked paper. https://drive.google.com/open?id=16XRAl_yAaEzbuyB-xwTcJE45tIaEeLyp The ingredients are PGM medium: 40 mg/L H3BO3 152 mg/L CaCl2(H2O) 150 g/L-sucrose 7 g/L agar, pH 5.6 incubate at room tem...
by Don
Thu Aug 22, 2019 11:15 pm
Forum: Rose Hybridizers Association Forum
Topic: Grid for pollen measurement
Replies: 14
Views: 480

Re: Grid for pollen measurement

Way cool.

An experiment to try would be to germinate some pollen and photograph it with an eye toward determining pollen viability.
by Don
Sat Aug 10, 2019 11:25 pm
Forum: Rose Hybridizers Association Forum
Topic: Is this color prediction chart accurate (or useful)?
Replies: 9
Views: 376

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

The genetics of flower color biochemistry are pretty well understood but for any particular cultivar the genes are not. For that reason the best predictive tool is experience. In particular, Paul Barden has often posted here about what to expect from many of the roses in his own stable. Steve Mcullo...
by Don
Mon Jul 01, 2019 2:02 pm
Forum: Rose Hybridizers Association Forum
Topic: Off topic - hops breeding
Replies: 0
Views: 392

Off topic - hops breeding

Is anyone among us familiar with hops breeding? If so I would like to ask some questions. Feel free to pm me or: don at rosebreeders.org.
by Don
Tue Jun 18, 2019 12:52 pm
Forum: Rose Hybridizers Association Forum
Topic: Rosa sericea as a parent rose?
Replies: 16
Views: 1475

Re: Rosa sericea as a parent rose?

None of the cultivars of omiensis that I grew were particularly glandular. I do not recall noting scented foliage in them or in the couple of cantabrigiensis OP that I grew which originated from seed copped at Kew although the flowers were lightly fragrant on all of them.
by Don
Thu Jun 13, 2019 10:38 pm
Forum: Rose Hybridizers Association Forum
Topic: When hardiness isn't an issue...
Replies: 11
Views: 636

Re: When hardiness isn't an issue...

®Bleeding Madras?
by Don
Sat Jun 01, 2019 8:51 am
Forum: Rose Hybridizers Association Forum
Topic: R. bracteata x Carefree Copper
Replies: 15
Views: 1158

Re: R. bracteata x Carefree Copper

>> Depends on what the breeder is going for That's true but the problem with species roses is that it is often hard to get an f1 from anything at all, let alone a cultivar of choice. Cannikin, for instance, can be used as a bridge in back crosses to bring in other traits from bracteata. >> Personall...