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Author Topic: Making 'Hakuun' by grafting onto Opuntia?  (Read 5243 times)

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Offline Lee

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Making 'Hakuun' by grafting onto Opuntia?
« on: Sunday, 08 April 2012 - 17:43:33 »
Hello Group,

I have read on the internet that 'Hakuun' plants can be made by grafting Astrophytum myriostigma nudum onto Opuntia ficus-indica.

It relies on a virus or 'virus like particle' for transmission from the Opuntia to the Astrophytum.

Does anyone know if this works when grafting onto every O.ficus-indica or is it necessary to graft it onto a selected clone
of O.ficus-indica that is 'infected' with this agent?

Your thoughts or advice would be most appreciated.
I hope I will not start a 'war' about virus infections!

With best regards
Lee (inUK)


Offline dag

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Re: Making 'Hakuun' by grafting onto Opuntia?
« Reply #1 on: Monday, 09 April 2012 - 10:17:22 »
you can have hakkun by grafting on a hakkun astrophytum or by not cleaning your knive after you cut a hakkun astrophytum and then graft a non hakkun astrophytum with the infected knive, i had this experience myself and saw it later described and illustrated in the astrophytum book of heinz hook. i think that is also the reason why many plants from certain asian nurseries are hakkun.

Offline Carlo & Daniele

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Re: Making 'Hakuun' by grafting onto Opuntia?
« Reply #2 on: Monday, 09 April 2012 - 15:55:12 »
I noticed too that offsets from nudum plants grafted on another stock turn out hakuun and side reverse.
Carlo & Daniele

Offline Lee

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Re: Making 'Hakuun' by grafting onto Opuntia?
« Reply #3 on: Monday, 09 April 2012 - 16:01:13 »
Hello dag,

Thank you for your help and observations.
Your confirmation of how infection can occur is very interesting to me.

I was also interested to hear that some nurseries have high level of Hakuun.

Can I ask if when you created Hakuun, was it in the cool season below 20 degC or
was it when temperature are higher?

I am curious because virus expression for some plants (not-cactus ) varies according
to temperature. Hot temperatures can sometims stop virus infections showing.

So I wonder....is it necessary to grow Astrophytum cool (below 20dgeC) for the symptoms to become first evident? 

On established plants, does anyone see their Hakuun symptoms change between winter and summer?.

Thank you for posting.
With regards
Lee (inUK)

Offline Lee

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Re: Making 'Hakuun' by grafting onto Opuntia?
« Reply #4 on: Monday, 09 April 2012 - 16:02:15 »
Hi Carlo and Daniele,

Thank you also for that interesting observation.

With regards
Lee (inUK

Offline fanecchissimo

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Re: Making 'Hakuun' by grafting onto Opuntia?
« Reply #5 on: Tuesday, 10 April 2012 - 17:13:26 »
i always found hakuun inheritable in a mendelian AD way... but maybe it is due to a virus. but i know not enough on this topic....

Offline Lee

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Re: Making 'Hakuun' by grafting onto Opuntia?
« Reply #6 on: Wednesday, 11 April 2012 - 11:26:06 »
Thanks fanecchissimo for your information.

It is interesting to know.
Virus passing through seed can be a complicated question and varies with the plant types.

With regards
Lee(inUK)


Offline Simon

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Re: Making 'Hakuun' by grafting onto Opuntia?
« Reply #7 on: Wednesday, 11 April 2012 - 12:41:34 »
It is very interesting that Hakuun might be an infection.
I took this offset from a normal white Fukuryu hakujo that was grafted on Pereskiopis. When it was grafted on an old Harrisia stock grown from cuttings it showed signs of Hakuun, see photo.
But when I grafted pups from the same plant onto Harissia stock grown from seed the growth was without Hakuun character.
Could it be the stock from cutting has virus infection and the seedling grown stocks don"t?


Offline fanecchissimo

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Re: Making 'Hakuun' by grafting onto Opuntia?
« Reply #8 on: Wednesday, 11 April 2012 - 14:18:30 »
@simon. i think the big difference is in the stock hormones in auxines and so on... not a viral problem. (just my opinion)

Offline Lee

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Re: Making 'Hakuun' by grafting onto Opuntia?
« Reply #9 on: Wednesday, 11 April 2012 - 19:07:23 »
Simon that is an interesting observation.

It we assume Hakuun is caused by virus infection, there may be different ways to explain your results.

Yes it could be that your new seedling Harissia did not have any virus for transmission while your old Harissia stock carried a virus.

For some plants the seedling generation is a way infections can be removed...though not for all plants as there are examples of virus being transmistted with the new seed.

You may also consider this idea...

With some other plants virus symptoms appear and dissapear sometimes due to cultural conditions.
Temperatures can modify if virus symptoms appear.
To illustrate....
If you use tobacco plants as indicator plants for virus infection the symptoms are best shown if temperatures are below 20degC. If indicator plants are grown hot...the symptoms do not appear.
The plants are still growing the virus infection but they are becoming asymptomatic (hiding the symptoms).

You can see this result in CMV infection of Tobacco plants.

If you grow infected Cymbidium orchids the TMV symptoms show early in the season when it is cool
at 10-15 degC. Later the symptoms stop showing  during summer when it becomes hotter.

So in conclusion, if Hakuun is a virus infection, and it responds like some virus, there may be a possibility that it shows according to the  temperature.

With regards
Lee(inUK)






Offline cortona

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Re: Making 'Hakuun' by grafting onto Opuntia?
« Reply #10 on: Thursday, 12 April 2012 - 21:19:21 »
i simply think that exist more akuun , not jsut one, one seems to be created by an infection but the other one that is preminent in the new cultivars are the result of crossing and recrossing and backrossing with ornatum fukuruyu(dinosaur) it seems that this type are ineritable and not depends from virus or rootstock.
that is just my 20 cents

Offline Fran64

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Re: Making 'Hakuun' by grafting onto Opuntia?
« Reply #11 on: Sunday, 30 December 2012 - 21:40:41 »
Someone knows Hakuun in capricornes, not affected by the virus?
I would be grateful if anyone has information.
Best regards.

 

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