[MAIPC] MAIPC Digest, Vol 91, Issue 11
Jennifer Forman Orth
jformanorth at gmail.com
Fri May 10 06:50:41 PDT 2019
It was never, in my experience, a challenge to find knotweed producing seed
in Massachusetts, typically with high germinability. It was so easy, in
fact, that I was skeptical of the UK studies til I actually went to England
and met with John Bailey (sorry John, if you ever see this :-)). We have a
fair mix of *japonica* and x *bohemica* in our state, with very scattered
*sachalinensis*.
Those interested may want to read:
Viability, Growth, and Fertility of Knotweed Cytotypes in North America
(Gammon et al. 2010)
https://www.cambridge.org/core/journals/invasive-plant-science-and-management/article/viability-growth-and-fertility-of-knotweed-cytotypes-in-north-america/712212E56023139A6EBF81747D4B229C
Sexual reproduction in the invasive species *Fallopia japonica*
(Polygonaceae)
(Forman and Kesseli, 2003)
https://bsapubs.onlinelibrary.wiley.com/doi/full/10.3732/ajb.90.4.586
- Jenn
--
********************************************************************
Jennifer Forman Orth, Ph.D.
Environmental Biologist
http://www.KnottyBits.com <http://www.knottybits.com/>
********************************************************************
On Fri, May 10, 2019 at 8:24 AM Young, Steve (DEC) <steve.young at dec.ny.gov>
wrote:
> There needs to be a lot more study of what is going on with male and
> female plants of knotweed. There are many instances of larger male plants
> growing right next to smaller female plants and some say that they are male
> and female of Reynoutria japonica and others say they are R. japonica and
> R. x bohemica. Why would R. x bohemica grow right next to japonica so
> often? The articles on genetic work in the northeast are lacking and, in my
> opinion, the whole fertile vs. infertile question needs more study before
> we can say just what is going on.
>
> Steve Young
> Chief Botanist
> NY Natural Heritage Program
>
>
> On 5/10/19, 7:51 AM, "MAIPC on behalf of maipc-request at lists.maipc.org" <
> maipc-bounces at lists.maipc.org on behalf of maipc-request at lists.maipc.org>
> wrote:
>
> ATTENTION: This email came from an external source. Do not open
> attachments or click on links from unknown senders or unexpected emails.
>
>
> Send MAIPC mailing list submissions to
> maipc at lists.maipc.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>
> https://protect2.fireeye.com/url?k=de071f8f-822213ec-de05e6ba-0cc47aa88e08-f3feb69bd481a741&u=http://lists.maipc.org/listinfo.cgi/maipc-maipc.org
> or, via email, send a message with subject or body 'help' to
> maipc-request at lists.maipc.org
>
> You can reach the person managing the list at
> maipc-owner at lists.maipc.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of MAIPC digest..."
>
>
> Today's Topics:
>
> 1. Re: [External] Slate Article on Japanese Knotweed
> (Richards, Christina)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 9 May 2019 21:28:55 +0000
> From: "Richards, Christina" <clr at usf.edu>
> To: "Muth, Norris (MUTH)" <MUTH at juniata.edu>, MAIPC Listserve
> <maipc at lists.maipc.org>
> Subject: Re: [MAIPC] [External] Slate Article on Japanese Knotweed
> Message-ID:
> <
> MN2PR08MB587078A50CE07C18C2A7D3B0BD330 at MN2PR08MB5870.namprd08.prod.outlook.com
> >
>
> Content-Type: text/plain; charset="windows-1252"
>
> Could be. But since its female it could also be pollinated by the
> hybrid R x bohemica.
>
> Christina Richards, Ph.D.
> MOPGA-GRI scholar
> University of T?bingen
> Plant Evolutionary Ecology group
> Auf der Morgenstelle 5
> D-72076 T?bingen
>
> Associate professor
> University of South Florida
> Department of Integrative Biology
> 4202 East Fowler Avenue SCA 127
> NES 107 (shipping)
> Tampa, FL 33620
> (813)974-5090
> (813)974-3263 FAX
>
> https://protect2.fireeye.com/url?k=cc612c79-9044201a-cc63d54c-0cc47aa88e08-844701bd91f81dc0&u=http://www.ecologicalepigenetics.com/
> Twitter: @EcolEpig
> Facebook: Ecological Epigenetics
>
> Under Florida law, all email to and from this address is considered
> public record.
> ________________________________
> From: Muth, Norris (MUTH) <MUTH at juniata.edu>
> Sent: Thursday, May 9, 2019 5:16 PM
> To: Richards, Christina; MAIPC Listserve
> Subject: Re: [MAIPC] [External] Slate Article on Japanese Knotweed
>
> Makes sense. I?ve seen Norway maples produce pounds and pounds of
> sterile fruits.
>
> If the major knotweed clone is female but produces lots of seed (at
> least occasionally) - is it likely that the seed is produced by apomixis?
>
> ?
> Norris Z. Muth, Ph.D.
> (he/him/his)
> Juniata College
> muthlab.org
>
> ________________________________
> From: Richards, Christina <clr at usf.edu>
> Sent: Thursday, May 9, 2019 4:15 PM
> To: MAIPC Listserve; Muth, Norris (MUTH); Melissa Bravo
> Subject: Re: [MAIPC] [External] Slate Article on Japanese Knotweed
>
> Hi!
>
> Many plants make flowers that never produce seeds, but we did find
> many that had tons of seeds. We tried to germinate seeds and it didn't work
> at all. I also have no experience finding seedlings in nature though we saw
> tons of seeds on some plants. I'm not aware of others that have been able
> to grow them from seeds, but I haven't looked very hard.
>
> I'm sure that probably the hybrids (between R. japonica and R.
> sachilinensis originally, but now called R. x bohemica) can make a ton of
> pollen (our R. japonica is only female), but they have also plenty of
> resources, they don't need a reason to make pollen or seeds. Thinking "it
> would not be worth it to the plant ecologically speaking to bother
> producing seeds if not for some season where it would be beneficial" is
> ignoring the reality of the plant. There's no reason not to make seeds and
> pollen even if almost all of them are not successful. It seems spread by
> rhizome works REALLY well, AND they are not limited by resources so can be
> truly wasteful in terms of producing pollen and seed. If only some small
> fraction is ever successful it can have hardly any or even no benefit when
> the plant is so successful at clonal spread. In essence, it doesn't have to
> be efficient. They make pollen and seeds because they can. Maybe sometimes
> it could be evolutionarily beneficial, but probably not
> required.
>
> Does that make sense?
>
> Christina Richards, Ph.D.
> MOPGA-GRI scholar
> University of T?bingen
> Plant Evolutionary Ecology group
> Auf der Morgenstelle 5
> D-72076 T?bingen
>
> Associate professor
> University of South Florida
> Department of Integrative Biology
> 4202 East Fowler Avenue SCA 127
> NES 107 (shipping)
> Tampa, FL 33620
> (813)974-5090
> (813)974-3263 FAX
>
> https://protect2.fireeye.com/url?k=41ba1af2-1d9f1691-41b8e3c7-0cc47aa88e08-1ae69555917a6919&u=http://www.ecologicalepigenetics.com/
> <
> https://protect2.fireeye.com/url?k=1371680d-4f54646e-13739138-0cc47aa88e08-c1d02e0848647e74&u=https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.ecologicalepigenetics.com&data=02%7C01%7Cclr%40usf.edu%7Ccd77e3c5bb484f09d3c408d6d4c3b943%7C741bf7dee2e546df8d6782607df9deaa%7C0%7C0%7C636930334425910934&sdata=MRX9XP9A4eT9TlYig2OdEYOBb8bXk8EmClXkaoHAZtg%3D&reserved=0
> >
> Twitter: @EcolEpig
> Facebook: Ecological Epigenetics
>
> Under Florida law, all email to and from this address is considered
> public record.
> ________________________________
> From: Melissa Bravo <bravomelissa at yahoo.com>
> Sent: Thursday, May 9, 2019 1:17 PM
> To: MAIPC Listserve; Richards, Christina; Muth, Norris (MUTH)
> Subject: Re: [MAIPC] [External] Slate Article on Japanese Knotweed
>
> ? I see pollen production on knotweed at my place, the bees love it.
> And I've always seen seed pods - so it would not be worth it to the plant
> ecologically speaking to bother producing seeds if not for some season
> where it would be beneficial - - seasonal triggers often do not get
> captured in one year, two year small site studies..
>
> but I did not read the article... just two -centencing- here lol.
>
> Melissa A. Bravo, M.S. CCA, Agronomist
> Meadow Lake Farm Consulting Services 814-574-4067 /
> bravomelissa at yahoo.com
>
>
>
>
>
>
>
>
> On Thursday, May 9, 2019, 12:50:22 PM EDT, Muth, Norris (MUTH) <
> MUTH at juniata.edu> wrote:
>
>
> There?s some knotweed hybridization which implies at least pollen
> production - and quite likely seed production. But the lack of genetic
> variability argues for clonal spread only. It?s sort of a similar story to
> Phragmites australis. Christina Richards - cited in the article - would
> likely know for sure.
>
> What do you say Dr. Richards? Viable seed production at all?
>
> ?
> Norris Z. Muth, Ph.D.
> (he/him/his)
> Juniata College
> muthlab.org
>
> ________________________________
> From: MAIPC <maipc-bounces at lists.maipc.org> on behalf of Rohrbaugh,
> Andrew <anrohrbaug at pa.gov>
> Sent: Thursday, May 9, 2019 11:53 AM
> To: MAIPC Listserve
> Subject: Re: [MAIPC] [External] Slate Article on Japanese Knotweed
>
>
> I don?t think there?s much evidence of seed production, although I
> recall someone studying the genetics of knotweed- Norris, do you recall
> that study?
>
>
>
> Knotweed is difficult to kill, but there?s some tricks to it (mowing
> it down first, letting it regrow, then spraying it)? and you have to keep
> after the patches. It?s got a really strong root system, and once it gets
> started in a disturbed area (due to a root fragment moving in during
> disturbance) subsequent disturbances make it hard to get other species
> established.
>
>
>
> Andrew Rohrbaugh | Botanist
>
> Pennsylvania Department of Conservation & Natural Resources
> Bureau of Forestry | Ecological Services Section
>
> PO Box 8552, 400 Market St, Harrisburg, PA 17105-8552
> Phone: 717.705.2823 | Fax: 717.772.0271
> anrohrbaug at pa.gov
>
> www.dcnr.state.pa.us<
> https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.dcnr.state.pa.us%2F&data=02%7C01%7Cclr%40usf.edu%7Ccd77e3c5bb484f09d3c408d6d4c3b943%7C741bf7dee2e546df8d6782607df9deaa%7C0%7C0%7C636930334425920929&sdata=Yu5C%2BhTgd%2FCCdq1yW49ZdelHp%2Ft%2F5cbX5quzRH0N1tc%3D&reserved=0
> >
>
>
>
> From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of frazmo
> Sent: Thursday, May 09, 2019 11:41 AM
> To: MAIPC Listserve <maipc at lists.maipc.org>
> Subject: [External] [MAIPC] Slate Article on Japanese Knotweed
>
>
>
> ATTENTION: This email message is from an external sender. Do not open
> links or attachments from unknown sources. To report suspicious email,
> forward the message as an attachment to CWOPA_SPAM at pa.gov<mailto:
> CWOPA_SPAM at pa.gov>.
>
> Read this article if you want to experience real terror...
>
>
>
>
> https://slate.com/technology/2019/05/japanese-knotweed-invasive-plants.html
> <
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fslate.com%2Ftechnology%2F2019%2F05%2Fjapanese-knotweed-invasive-plants.html&data=02%7C01%7Cclr%40usf.edu%7Ccd77e3c5bb484f09d3c408d6d4c3b943%7C741bf7dee2e546df8d6782607df9deaa%7C0%7C0%7C636930334425920929&sdata=5gm9hKr0z%2FGlm3eeqHGQh5kp%2BVUD%2FmvSbR06R%2BB77q8%3D&reserved=0
> >
>
>
>
> And two questions for possible discussion:
>
>
>
> 1. Do MAIPC listserv readers find JK as hard to kill as described in
> the article?
>
>
>
> 2. I have seen isolated plants come up in some odd places. Does anyone
> know whether there is any evidence of JK spreading by seeds in our
> mid-Atlantic area?
>
>
>
> Cheers, Steve Young, Arlington VA volunteer
>
>
>
>
> CONFIDENTIALITY NOTICE: The materials in this electronic mail
> transmission (including all attachments) are private and confidential and
> are the property of the sender. The information contained in the material
> is privileged and is intended only for the use of the named addressee(s).
> If you are not the intended addressee, be advised that any unauthorized
> disclosure, copying, distribution or the taking of any action in reliance
> on the contents of this material is strictly prohibited. If you have
> received this e-mail in error, please immediately notify the sender by
> replying to the e-mail, and then destroy it immediately. Thank you.
> _______________________________________________
> MAIPC mailing list
> MAIPC at lists.maipc.org<mailto:MAIPC at lists.maipc.org>
>
> https://protect2.fireeye.com/url?k=91a02176-cd852d15-91a2d843-0cc47aa88e08-a1083c53decfb39f&u=http://lists.maipc.org/listinfo.cgi/maipc-maipc.org
> <
> https://protect2.fireeye.com/url?k=de79c9c8-825cc5ab-de7b30fd-0cc47aa88e08-bd4e5e94a43b893a&u=https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.maipc.org%2Flistinfo.cgi%2Fmaipc-maipc.org&data=02%7C01%7Cclr%40usf.edu%7Ccd77e3c5bb484f09d3c408d6d4c3b943%7C741bf7dee2e546df8d6782607df9deaa%7C0%7C0%7C636930334425930922&sdata=h1eCuWFEiiSdiNRcFe%2Fx3mbIMjCAP3BUrhBHaLwwchY%3D&reserved=0
> >
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> https://protect2.fireeye.com/url?k=cba2e169-9787ed0a-cba0185c-0cc47aa88e08-19783544a26cd5ab&u=http://lists.maipc.org/pipermail/maipc-maipc.org/attachments/20190509/98202784/attachment.html
> >
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> MAIPC mailing list
> MAIPC at lists.maipc.org
>
> https://protect2.fireeye.com/url?k=3d5aa877-617fa414-3d585142-0cc47aa88e08-7019402fda59d0ee&u=http://lists.maipc.org/listinfo.cgi/maipc-maipc.org
>
>
> ------------------------------
>
> End of MAIPC Digest, Vol 91, Issue 11
> *************************************
>
>
> _______________________________________________
> MAIPC mailing list
> MAIPC at lists.maipc.org
> http://lists.maipc.org/listinfo.cgi/maipc-maipc.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.maipc.org/pipermail/maipc-maipc.org/attachments/20190510/af0bef95/attachment-0001.html>
More information about the MAIPC
mailing list