That's like the best teacher..simple and lucid language Thanks for this info :)
On Thu, Oct 3, 2013 at 7:55 PM, Nidhan Singh <[email protected]>wrote: > Useful information needed to understand the world of orchids..thanks > Pankaj ji > > > On Thu, Oct 3, 2013 at 7:13 PM, Gurcharan Singh <[email protected]>wrote: > >> Thanks Pankaj ji for this very useful information. >> >> 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://www.gurcharanfamily.com/ >> http://people.du.ac.in/~singhg45/ >> >> >> On Thu, Oct 3, 2013 at 6:45 PM, Pankaj Kumar <[email protected]>wrote: >> >>> Orchids have lightest seed among the angiosperms and one of the reason >>> for that is the lack of endosperm, that is the, reserved food >>> material. So orchid seeds need external support to germinate. Here >>> comes the role of mycorrhiza, a kind of fungi. >>> >>> Fungi in turn are always very specific as we know that there are very >>> specific fungi that infects specific fruits. This compatibility >>> depends on the ability of the fungi to infect another organism, the >>> composition of the cell wall of both. In case of orchids, first >>> infection is when fungi gets associated with the seed. Such fungi or >>> mycorrhiza are of two types, one which are very generalized, i.e., >>> they can infect seeds from many species; second which are very >>> specific, as they can infect very specific seeds. These fungal >>> filaments or mycorrhiza links seeds with another plant and kind of >>> helps in transfer of food from other plant (live or dead) to the >>> orchid seeds. One more fact is, there could be more than one >>> mycorrhiza associated with the seeds in one time. >>> >>> Now where this fungi is found is also very specific, a fungi growing >>> in warmer temperature will not be found in cooler areas; a fungi >>> growing in very high humidity will not be found in drier areas; and >>> one of the most specific thing is, a fungi that is found in the litter >>> of SAL tree leaves, may not be found on the TEAK tree leaves. >>> So if there is a specific fungi which can infect orchid seed and is >>> found in a SAL forests, then this also implies that the orchid will be >>> found exclusively in the SAL forests and nowhere else. If the orchid >>> and fungi have very generalized requirement then they tend to be very >>> widespread. >>> >>> To meet up with all this fungal requirement, one orchid fruit holds >>> millions of seeds, but yes the chance of survival is very low, but >>> even if it is 5 % thats enough for every year. >>> >>> Fungi also acts as a kind of biological control otherwise with so many >>> species and so many seeds, there would have been orchids growing in >>> every corner of the world!!! >>> >>> NOTE: I am trying to use very simple and not technical words, so as to >>> make it understandible to every one. >>> Please feel free to question back if you dont understand any point. :) >>> Best regards >>> Pankaj >>> >>> >>> >>> -- >>> *********************************************************** >>> Pankaj Kumar, Ph.D. >>> IUCN-SSC Orchid Specialist Group Asia >>> >>> Office: >>> Conservation Officer >>> Orchid Conservation Section >>> Flora Conservation Department >>> Kadoorie Farm and Botanic Garden (KFBG) Corporation >>> Lam Kam Road, Tai Po, New Territories, Hong Kong. >>> Residence: >>> 151, 1st Floor, Tai Om Tsuen >>> Lam Tsuen, Tai Po, New Territories, Hong Kong. >>> >>> email: [email protected]; [email protected] >>> Phone: +852 2483 7128 (office - 8:30am to 5:00pm); +852 9436 6251 >>> (mobile). Fax: +852 2483 7194 >>> >>> -- >>> 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. >>> >> >> -- >> 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. >> > > > > -- > Regards, > > Dr. Nidhan Singh > Assistant Professor > Department of Botany > I.B. (PG) College > Panipat-132103 Haryana > Ph.: 09416371227 > > -- > 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. > -- Smita Raskar 308 Disha Residency, Salaiwada,Sawantwadi Mob.09422379568 -- 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.
