Dear Surjit ji, Thank you so much for making me think. Ok now our flowers of Crinum. Basically as you have observed the stamens are not sacrificed. But if you recollect Crinum has 6 petals and 6 stamens. In our flower the way petals are doubled even stamens are also doubled. They are 12 in number. Hence it is the case of Poliploidy. I forgot to mention one part, such aberrations can occur naturally as well as can be created artificially. The tissue culture in artificial hybridization plays a important part. Thanks again. Madhuri
________________________________ From: surajit koley <[email protected]> To: Madhuri Pejaver <[email protected]> Cc: J.M. Garg <[email protected]>; efloraofindia <[email protected]>; Shubhada Nikharge <[email protected]>; Ushadi Micromini <[email protected]> Sent: Wednesday, 3 July 2013 7:08 AM Subject: Re: Fwd: [efloraofindia:158665] what produces double flower ??? Good morning Madam Thank you very much for this elaborate lesson on mutation and chromosomal aberration. Since the flower in https://groups.google.com/forum/#!msg/indiantreepix/7-kRSVOxAMQ/sDatK69AGYAJ had not been resulted out of sacrificing stamens (as have been explained in https://en.wikipedia.org/wiki/Double-flowered#Genetics_of_double-flower_mutations), i think the abnormality lies in tissue differentiation due to certain changes in gene expressions, rather than a polyploidy condition. Regards, surajit On Wed, Jul 3, 2013 at 12:51 AM, Madhuri Pejaver <[email protected]> wrote: Dear Gargji and Surjitji, >Thanks for the querry. >First when the word Mutation got coined it was for the modification of similar >nature in plant Oenothera lamarkiana. In this the leaves and flowers of the >plant was suddenly observed to be larger on one branch of the plant. There was >no indication of such change prior when it was visible. Hence Hugo de varies >called it as Mutation which means sudden change without any indication in the >previous generation. >Latter when the structure of gene was studied and is known the changes which >occur at gene level are called as Mutation. While the changes which occur in >numerical form or structural form of chromosomes are called as chromosomal >aberrations. >Accordingly the actual discovery of mutation also was turned out to be >chromosomal aberration. When the change occurs at gene level it is called as >mutation. eg diseases like Thalasemia, hole in the septum of heart, or such >are examples of point mutations. Not able to recollect the examples in plants. >But if such changes occur in the reproductive cells/germinal cells they are >passed to the gametes and then to the next generation. But if the changes >occur in somatic cells then they are not passed to future generation. >Thus after the discovery of genes the chromosomal aberrations and the >mutations are differentiated. The polyploidy thus falls under Chromosomal >aberrations. >Madhuri > > From: J.M. Garg <[email protected]> >To: efloraofindia <[email protected]> >Cc: surajit koley <[email protected]>; Shubhada Nikharge ><[email protected]>; Madhuri Pejaver <[email protected]>; >Ushadi Micromini <[email protected]> >Sent: Tuesday, 2 July 2013 6:23 PM >Subject: Fwd: [efloraofindia:158665] what produces double flower ??? > > > >Forwarding again for any assistancein the matter please. > > >---------- Forwarded message ---------- >From: surajit koley <[email protected]> >Date: 27 June 2013 23:45 >Subject: [efloraofindia:158665] what produces double flower ??? >To: efloraofindia <[email protected]> > > >Sir, > > >This is related to earlier discussion - >https://groups.google.com/forum/#!msg/indiantreepix/7-kRSVOxAMQ/sDatK69AGYAJ >and part thereof - >https://groups.google.com/forum/?hl=en#!topic/indiantreepix/WacK5j7fs1g. > > >It seems to me that two flowers (Crinum latifolium) fused together! > > >Why? > > >Polyploidy, as had been explained in the above threads? > > >Or, was it mutation in normal diploid cells? > > >I tried to find.... but.... > > >Polyploidy can result various alterations - > 1. > http://www.gardengenetics.com/gardengenetics/2011/01/polyploid-induction-i-----potential-benefits-to-the-end-user.html > > 2. > http://www.gardengenetics.com/gardengenetics/2011/02/polyploid-induction-i-----potential-benefits-to-end-user.html > > 3. > http://www.gardengenetics.com/gardengenetics/2011/02/polyploid-induction-iii-potential-drawbacks.html > > 4. http://plantbreeding.coe.uga.edu/index.php?title=5._Polyploidy > >Very tough for a layman - > * > https://en.wikipedia.org/wiki/Double-flowered#Genetics_of_double-flower_mutations > > * https://en.wikipedia.org/wiki/ABC_model > > * http://biology.ucsd.edu/news/article_051000.html > > * http://www.google.com/patents/EP0578941A1?cl=en > >Can anybody please explain in simpler terms? > > >Thank you >Regardssurajit > > > > > > -- >You received this message because you are subscribed to the Google Groups >"efloraofindia" group. >To unsubscribe from this group and stop receiving emails from it, send an >email to mailto:indiantreepix%[email protected]. >To post to this group, send email to [email protected]. >Visit this group at http://groups.google.com/group/indiantreepix. >For more options, visit https://groups.google.com/groups/opt_out. > > > > > >-- > >With regards, >J.M.Garg >http://en.wikipedia.org/wiki/User:Jmgarg1 >'Creating awareness of Indian Flora & Fauna' >The whole world uses my Image Resource of more than a thousand species & eight >thousand images of Birds, Butterflies, Plants etc. (arranged alphabetically & >place-wise): http://commons.wikimedia.org/wiki/Category:J.M.Garg. You can also >use them for free as per Creative Commons license attached with each image. >For identification, learning, discussion & documentation of Indian Flora, >please visit/ join our Efloraofindia Google e-group (largest in the world): >http://groups.google.co.in/group/indiantreepix (more than 2110 members & >1,56,000 messages on 31/5/13) or Efloraofindia website: >https://sites.google.com/site/efloraofindia/ (with a species database of more >than 8500 species). >Also author of 'A Photoguide to the Birds of Kolkata & Common Birds of India'. > > > -- You received this message because you are subscribed to the Google Groups "efloraofindia" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/indiantreepix. For more options, visit https://groups.google.com/groups/opt_out.
