Sorry for having missed the original post of Samir ji. The plants of hybrid
nature are often sterile (say a diploid plant resulting from a cross between
two diploid species) because when meiosis occurs during the formation of
male gametes (in anther) and female gamete (in ovule) there can't be normal
pairing between chromosomes, because there is only one set from each
species, Hybridization followed by duplication of chromosomes establishes
a tetraploid (allopolyploid; amphiploid) with normal pairing as both genomes
are in pairs. Such a tetraploid hybrid with distinct characteristics will
reproduce normally and would be fertile. Such duplication of chromosome
numbers occurs naturally in genera like Senecio and Tragopogon. A triploid
hybrid between a diploid species and a tetraploid species may, similarly,
not survive or reproduce sexually as genome from the diploid parent would
exhibit the problem of pairing at meiosis but the hybridization followed by
duplication leading to hexaploidy can form a perfectly normal independent
species. Senecio (Asteraceae) includes the diploid S. squalidus (2n = 20),
the tetraploid S. vulgaris (2n = 40) and the hexaploid S. cambrensis (2n =
60). The last is intermediate in morphology between the first two and is
found in the area where these two grow. Additionally, sterile triploid
hybrids between two species have been reported. It seems clear that S.
cambrensis is an allohexaploid between the other two species. Tragopogon
mirus (2n = 24), a tetraploid species arose as an amphiploid between two
diploid species, T. dubius and T. porrifolius (2n = 12). The most
significant case, however, is the common bread wheat Triticum aestivum, a
hexaploid with AABBDD genome. Genome analyses have confirmed that genome A
is derived from the diploid T. monococcum, B from Aegilops speltoides, both
genomes being represented in the tetraploid T. dicoccum. Genome D is derived
from the diploid Aegilops tauschii.
What nature does, man has achieved by commonly the use of colchicine. A
diploid sterile species can be rendered fertile by doubling the chromosome
number through colchicine treatment and making it fertile. tetraploid.
Incidently I had described and named a new tetraploid species
Tragopogon kashmirianus in 1976.
--
Dr. Gurcharan Singh
Retired Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Phone: 011-25518297 Mob: 9810359089
http://people.du.ac.in/~singhg45/
On Wed, Mar 17, 2010 at 11:02 AM, Anand Kumar Bhatt
<[email protected]>wrote:
> Gurcharanji, can you enlighten?
> ak
>
> ---------- Forwarded message ----------
> From: Anand Kumar Bhatt <[email protected]>
> Date: Wed, Mar 17, 2010 at 5:55 AM
> Subject: Re: [efloraofindia:28219] Species of bougainvillea which is
> fertile & long day plant (Samir Takaochi)
> To: "J.M. Garg" <[email protected]>
>
>
> Gargji, what is a fertile and long day plant? Being an amateur, I am not
> aware of these terms.
> Thanks
> ak
>
>
> On Wed, Feb 24, 2010 at 1:54 PM, J.M. Garg <[email protected]> wrote:
>
>> Forwarding again for any assistance pl. in the matter.
>>
>>
>> ---------- Forwarded message ----------
>> From: Samir Takaochi <[email protected]>
>> Date: 2010/1/21
>> Subject: [efloraofindia:26680] Species of bougainvillea which is fertile &
>> long day plant (Samir Takaochi)
>> To: indiantreepix <[email protected]>
>>
>>
>> Hello, friends. I would like to seek guidance from all of you.
>>
>> Generally its infertile after repeaded genetical control.
>>
>> But I heard that Indian scholar has challenged and made it fertile by
>> making diploid species into tetraploid through colchicine treatment.
>>
>> My question:
>>
>> *Is there spieces of bougainvillea which is fertile in India and is it
>> easily avaialble in the market? *
>>
>> *Also Bougainvillea is said as short day plant, but I observed that
>> generally species of bougainvillea in Indian park is long‐day plant. Is it
>> correct?*
>>
>> Could someone advice me?
>>
>> Best Regards,
>>
>> Samir Takaochi
>>
>>
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>>
>>
>>
>> --
>> With regards,
>> J.M.Garg ([email protected])
>> http://en.wikipedia.org/wiki/User:Jmgarg1
>> 'Creating awareness of Indian Flora & Fauna'
>> Image Resource of more than a thousand species of Birds, Butterflies,
>> Plants etc. (arranged alphabetically & place-wise):
>> http://commons.wikimedia.org/wiki/Category:J.M.Garg
>> For learning about Indian Flora, visit/ join Google e-group-
>> Efloraofindia:http://groups.google.co.in/group/indiantreepix
>>
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>
>
>
> --
> Anand Kumar Bhatt
> A-59, B.S.F.Colony, Airport Road
> Gwalior. 474 005.
> Tele: 0751-247 2233. Mobile 0 94253 09780.
> My blogsite is at:
> http://anandkbhatt.blogspot.com
> (A new blog has been added on 11 March 10.)
> And the photo site:
> www.flickr.com/photos/akbhatt/
> ~~~~~~~~~~~~~~~
> Ten most common surnames of Indians: Singh, Kumar, Sharma, Patel, Shah,
> Lal, Gupta, Bhat, Rao, Reddy. Cheers!
>
>
>
> --
> Anand Kumar Bhatt
> A-59, B.S.F.Colony, Airport Road
> Gwalior. 474 005.
> Tele: 0751-247 2233. Mobile 0 94253 09780.
> My blogsite is at:
> http://anandkbhatt.blogspot.com
> (A new blog has been added on 11 March 10.)
> And the photo site:
> www.flickr.com/photos/akbhatt/
> ~~~~~~~~~~~~~~~
> Ten most common surnames of Indians: Singh, Kumar, Sharma, Patel, Shah,
> Lal, Gupta, Bhat, Rao, Reddy. Cheers!
>
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