Nice Information Pankaj Ji
On Thu, Oct 3, 2013 at 8:05 PM, Smita Raskar <[email protected]> wrote: > 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. > -- Regards Dr Balkar Singh Head, Deptt. of Botany and Biotechnology & Horticulture Incharge Arya P G College, Panipat Haryana-132103 09416262964 -- You received this message because you are subscribed to the Google Groups "efloraofindia" group. 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