WEEK 4: ENDOSYMBIOSIS THEORY AND DIVISION CYCLE OF PLANT CELL AND TOTIPOTENCY

In the next class on week 4, we went through endosymbiosis theory. from this theory i learned how mitochondria and chloroplast presence in eukaryotic cells. the ancestry of mitochondria and chloroplast are proteobacterium and cyanobacteria.
mitochondria also got its own circular DNA and reproduces independently the cell in which it is found. Chloroplast also contains its own DNA and are able to grow and reproduce independently within the cells of plants and other protista that conduct the complex chemistry in photosynthesis.

http://www.fossilmuseum.net/Evolution/Endosymbiosis.htm

For the totipotency in plants, it really caught my attention because before this since in school, i really do not like whatever kind of topics that related to plants. It makes me bored and hardly to pay attention but on this topic I can see the flow of the development in plants from cell and then become callus. Finally it grows into whole plant. From the tissue culture, the plant can undergo either organogenesis or somatic embryogenesis. in organogenesis, the cell will develop become shoot or root first. Then, it grows further become the whole plant. while in somatic embryogenesis, there is no fusion between gametes and the plant is developed from somatic cells. organogenesis can be divided into two which are direct organogenesis and indirect organogenesis. Somatic embryogenesis also can be divided into two. Direct somatic embryogenesis and indirect somatic embryogenesis. 





 
I do not know how come I like this topic but on the other topics that related to plants, I gave a little focus on it. Maybe this topic, I can understand it well but not the others. So I need to give more effort on the other topics as well.

http://www.slideshare.net/avinashsharma40/somatic-embryogenesis-27-march-15-300-pm