𝗦𝘂𝗺𝗺𝗮𝗿𝘆 𝗼𝗳 664 th 𝗱𝗮𝘆 𝗼𝗳 𝗖𝗵𝗮𝘁𝘀𝗵𝗮𝗮𝗹𝗮 (12/1/2022)
We started the discussion about coral…
Rati have some practicals about coral in her college
What is corals???
Corals are marine invertebrates within the class Anthozoa of the phylum Cnidaria. They typically form compact colonies of many identical individual polyps. Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton.
Good example of coral is sea fan coral.
connection between Corals and Hydra
Both of them are coming under same phylum Cnidaria
Hydra is the one our model system…
How can culture the Hydra in our Home labs???
What they eat???
*we need dechlorinated water for culturing Hydra…
Hydra is feed on moina ( it is an another model system ), Small insects
How will we get the dechlorinated water???
Why we are adding milk while culturing the moina???
Then back to the cnideran’s discussion…
Cnidarians have cnidoblasts, it present on the tentacles and the body, it is used to capture the pray.
what is polyp and medulla???
Polyp and medusa are two different life cycle stages of many species of the phylum Cnidaria. The phylum Cnidaria includes species existing only in the polyp stage (Anthozoa), species existing in the medusa stage, and species with both life cycle stages (Hydrozoa).
Polyp is represents the asexual stage.
Medulla is represents the sexual stage
The asexual polyp generation alternates with sexual medusa generation
Example : Obelia
Obelia is a genus of hydrozoans, a class of mainly marine and some freshwater animal species that have both polyp and medusa stages in their life cycle. Hydrozoa belongs to the phylum Cnidaria, which are aquatic (mainly marine)
Similarities between Jelly fish and Hydra, coral…
How does Hydra regenerate?
Do corals also regenerate?
Some reference that taken from the chat box
Studies using cnidarian model species (especially the freshwater polyp Hydra and recently the sea anemone Nematostella) identified a suite of molecular and cellular mechanisms of regeneration, some of which are conserved across the animal kingdom. In addition to being excellent lab models, many cnidarian species have critical ecosystem building roles of global significance.
A coral “group” is a colony of myriad genetically identical polypshttps://en.wikipedia.org/wiki/Coral
Although it is extremely difficult to obtain and study live coral polyps in the classroom, hydras, freshwater cousins of corals, are readily available. Luckily, there are many similarities between these two animals, so studying hydras can help us understand more about corals. https://serc.carleton.edu/eslabs/corals/2a.html
A recent report based on molecular phylogeny shows the species relation-ships within the genus Hydra22 found across the globe. https://www.researchgate.net/publication/281457720_Description_and_phylogenetic_characterization_of_common_hydra_from_India
Molecular signature of an ancient organizer regulated by Wnt/β-catenin signalling during primary body axis patterning in Hydra
Hydra is one of the few organisms that possess tremendous regeneration potential, capable of regenerating complete organism from small tissue fragments or even from dissociated cells. https://pubmed.ncbi.nlm.nih.gov/31598861/#:~:text=Hydra%20is%20one%20of%20the,understanding%20the%20process%20of%20regeneration.
One reference of coral regeneration shared by jai kishan sir
Seeing’ without eyes: Hydra stinging cells respond to light
March 5, 2012https://www.sciencedaily.com/releases/2012/03/120305081421.htm
Pdf send by rati chaturvedi
others please add your points …