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 This is a continuously updated archive of the Aroid-L mailing list in a forum format - not an actual Forum. If you want to post, you will still need to register for the Aroid-L mailing list and send your postings by e-mail for moderation in the normal way.

  Leaflet use for tuber production.
From: "Julius Boos" <ju-bo at msn.com> on 2007.01.24 at 10:41:58(15117)
Dear Friends,

It is well known that in a couple of genera of aroids, the shed or
knocked-off leaflets can and will grow into new plants. The two best known
examples are the notoriously weedy and invasive Gonotopus boivinii ( I
wonder if this is the only species in this five-species genus that does
this?), and to a lesser extent its relative, Zamioculcas zamifolia.
I am looking for any and all information on how sucessful reproduction or
multiplication has been achieved in OTHER genera of aroids by using small
cuttings or portions of leaf (like it has been done in Amorphophallus
titanum).
Information which I need should include the aproximate age/condition of the
leaf cutting used, the names of rooting hormones/powder that may have been
used to coat the cut ends of the leaflets, and importantly what genera and
species of aroid has this method been attempted with, and which were
sucessful at acheiving rooting and new tuber/corm formation. etc.
I THINK that there has been information published on this, perhaps in a
back-issue of our Aroideana, so if possible I also like information on
when/where any publications concerning this method have been published.
Please contact me off-line if you are more comfortable with that.

Thanks a million.

Good Growing,

Julius

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From: "Derek Burch" <derek at horticulturist.com> on 2007.01.24 at 17:09:41(15122)
Even if done in Aroideana in the past, may I put in a request for a future
article on this. Derek

Addendum for everyone: By the way, the seed/seedling things are coming in
slowly. I haven't closed the door yet. Tell us how the dried up seed from
an herbarium sheet was brought back to life, or the seed that went through
the laundry twice in your trouser pocket came up in two days. All tall tales
carefully peer-reviewed!

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From: Tony Avent <tony at plantdelights.com> on 2007.01.24 at 17:50:21(15125)
Julius:

We have been experimenting with leaf cuttings on aroids for several
years and are working on a formal article with our results with
amorphophallus. We have had success within the genera of
Amorphophallus, arisaema, pseudodracontium, and pinellia.

Tony Avent

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From: ted.held at us.henkel.com on 2007.01.24 at 17:51:36(15126)
If this query draws responses, please
keep the list informed. Julius is not the only one interested in this topic.

Ted.

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From: "D. Christopher Rogers" <crogers at ecoanalysts.com> on 2007.01.24 at 18:14:41(15128)
Howdy!

At the University of California, Davis Conservatory we have propagated
Amorphophallus titanium from leaflets. The guy who developed the method
there is Ernesto Sandoval. Best results are obtained from terminal leaflets
with a petiole about as thick as your index finger. The lamina is stripped
from the portion of the petiole to be buried. The medium is
vermiculite/perlite, and it is important to keep them upright, even propping
them up if necessary. They are treated with a low dosage hormone (Rootone
F), given plenty of bottom heat and high humidity.

I hope this helps,
Christopher

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From: Steve Marak <samarak at gizmoworks.com> on 2007.01.24 at 21:48:36(15131)
On Wed, 24 Jan 2007, Tony Avent wrote:

> Julius:
>
> We have been experimenting with leaf cuttings on aroids for several years and
> are working on a formal article with our results with amorphophallus. We
> have had success within the genera of Amorphophallus, arisaema,
> pseudodracontium, and pinellia.

I've had good results with amorphophallus, so I'm not surprised to see
pseudodracontium in your list. But arisaema does surprise me. Does that apply
generally, or are there particular species or a section of the genus which can
be rooted from leaf cuttings?

Steve

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From: "Peter Boyce" <botanist at malesiana.com> on 2007.01.24 at 21:49:08(15132)
to Tony's list of aroids possible from leaf cuttings and leaf blade
('Begonia-style') propagation I can any quite a few Schismatoglottis
propagate in this manner.

Peter

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From: "Weaver, Bill" <bill.weaver at hp.com> on 2007.01.24 at 23:02:20(15133)
I have 'cloned' A. titanum using a relatively new leaflet and
"Olivias' Cloning Gel". It is just a weak fertilizer in a gel
base of some sort. No hormones. But it seems to work. "Rootone"
rooting hormone did almost nothing.

Bill Weaver

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From: "Ron" <ronlene at bellsouth.net> on 2007.01.24 at 23:52:35(15135)
I would like to get the article on Leaf-cuttings with Amorphophallus. Is one
available? Ron zone 10

-----Original Message-----

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From: Ken Mosher <ken at spatulacity.com> on 2007.01.25 at 01:17:18(15137)
I can say anecdotally that Amorph koratensis will grow a new tuber if
you yank off the leaf and stick it in a glass (or vase) of water. Why
would someone conduct such an experiment, you ask? Maybe nobody in their
right mind would, but that does not preclude my mother!

I had stuck a number of tubers in the ground at her Florida house.
Nothing to lose, I had extras. She thought it was a weed, then
remembered that maybe it wasn't and stuck it in water before calling me.
I said, "Well, leave it in water. It will either live or die. It's free
to try." When I went down at Christmastime the leaf had just yellowed
and there was a small funny-looking tuber that seemed to have three
growth points. It might have actually been three separate small tubers.

-Ken

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From: "StroWi at t-online.de" <StroWi at t-online.de> on 2007.01.25 at 08:29:19(15142)
Aroiders,

I remember that this was topic some years ago (you might search the
archives), but in that time there was much concern that this discussion
might end up in crowds of plant nuts taking leaf cuttings of every
A.titanum they can ever find in any Botanical Garden... ;-)
(BTW, I think that threat is real...)

When this discussion was going on I wondered if the possibility of
growing bulblets from leafs is retricted the the few Amorphophallus sp.
that build bulblets in the leaf axills.

Very interesting to read that leaf cuttings some sp. regenerate roots
and subsequently tuberlike organs.

@ Christopher,

congratulatins to you and Ernesto Sandoval for your success with
titanum.

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From: Tony Avent <tony at plantdelights.com> on 2007.01.25 at 11:48:53(15143)
Steve:

It was one of the tropical arisaemas that we tried as an afterthought,
but we haven't ventured into other species yet.
Tony Avent

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From: Tony Avent <tony at plantdelights.com> on 2007.01.25 at 11:56:41(15144)
Ron:

It is our hope that it will be worthy of publication in Aroidiana when
we have completed the write-up...stay tuned.
Tony Avent

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From: "Michael Pascall" <mickpascall at hotmail.com> on 2007.01.25 at 12:38:22(15145)
I have had amazing success with Psuedodracontium leaf cuttings , there was
mention on this list back in '99 about another grwers positive results . I
got tubers 2-3 cms long and over 1cm dia in just one season , yes we do have
a long growing season here . Done all of the spp. I have and just did more
of the spotted lacourii . Excellent way to propagate extra colourful forms ,
as I would imagine that the tubers from cuttings would be as spotty as the
mother plant .

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From: Douglas Ewing <dewing at u.washington.edu> on 2007.01.25 at 16:48:03(15146)
I have been cloning A.titanum via leaflet cuttings for a number of years
now. I put the piece of leaflet in a miniature greenhouse constructed of 2
clear 2 liter pop bottles. I insert the cutting into a block of rockwool,
or a small pot of peat-based potting soil. I do not use rooting hormone
applications- I was under the impression that this might delay, rather
than speed, the development of shoots, since they are auxins. Either way,
one is interested in getting the leaf cutting to produce a shoot ( albeit
modified into a tuber) not roots. After several months of being closed in
this high humidity capsule, the leaf turns yellow, then brown, then finally
is removed and I find a tuber below the media surface that is a couple of
centimeters in diameter. When setting up this cutting, and periodically
as needed, I dust the plant with my fungicide of choice- cinnamon powder,
the stuff you put on your oatmeal. This works remarkably well to reduce
fungal problems in the high humidity.

Doug

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From: piaba <piabinha at yahoo.com> on 2007.01.25 at 16:55:10(15147)
ken, but did the tubers produce any plants?

with the genus Sinningia (Gesneriaceae), tubers can be
induced to form from leaf cuttings, but often these
are blind, with no subsequent growth points.

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From: "D. Christopher Rogers" <crogers at ecoanalysts.com> on 2007.01.25 at 18:18:55(15148)
Hello, Bernhard!

Since you raised the issue of "plant nuts" thieving titanium leaflets, I am
wondering if I should answer your question. ;-)

Actually, the leaflets produce a small bulb first (about two months to do
so), and then from the bulb start producing roots (about another two
months), and then the leaflet falls off/dies and the bulb goes put up a new
small leaf or went into a short dormancy, and then put up a small leaf.
Leaflet cuttings with a petiole about 2cm thick or more were 80% successful.
Leaflets with the petiole with less of a diameter were only bout 25%
successful. The younger leaflets work best. The leaflets from older leaves
never worked.

I hope this is what you needed to know,
Christopher

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From: "StroWi at t-online.de" <StroWi at t-online.de> on 2007.01.25 at 19:32:15(15150)
Doug,

what is the actual size of the leaflet in cm or inch you use?
And what is m eant by several month?
I guess at least 2...... ;-)

It is very impressive that you get tubers of several cm diameter.
How long do they take to grow the first leaf then?

Good propagating,
Bernhard.

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From: Ken Mosher <ken at spatulacity.com> on 2007.01.26 at 04:49:43(15160)
Hi tsuh yang - I don't know, I told mom to stick them back in the
ground. They wouldn't be up this quickly even if she followed my
directions, and based on historical observations she probably didn't.

-Ken

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From: Douglas M Ewing <dewing at u.washington.edu> on 2007.01.27 at 19:30:08(15177)
Bernhard, I use cuttings of 25-30cm long. I have to fold the leaflets a bit to get them inside the pop-bottle. The leaflet tissue takes maybe 4 months to die. Sometimes the tuber will take 3-4 months to send up a new leaf.

Doug

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From: "StroWi at t-online.de" <StroWi at t-online.de> on 2007.01.28 at 12:29:51(15179)
Christopher,

after reading your answer I guess that the threat of "plant nuts"
thieving titanium leaflets is not so big, since the cuttings have to be
pretty big. Where to hide them?
On the other hand the damage would be pretty big, if someone dares to
steal a cutting.

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From: "StroWi at t-online.de" <StroWi at t-online.de> on 2007.01.28 at 12:35:07(15180)
Doug,

thanks for the information.

Together with Christopher's mail it is clear that this method works.
But it seem to be no possibility for large scale propagation of titanum,
since rather big mother plants are needed and the time is at least 4
month to get one tuber/plant from such a big cutting.

Nevertheless congratulations to the success!

Happy propagating,
Bernhard.

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