Introduction to Botany. Lecture 10
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1 Introduction to Botany. Lecture 10 Alexey Shipunov Minot State University September 21, 2015 Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
2 Outline 1 Questions and answers 2 s from cells: mitochondria and chloroplasts boundaries Protein synthesis Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
3 Outline 1 Questions and answers 2 s from cells: mitochondria and chloroplasts boundaries Protein synthesis Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
4 Questions and answers Previous final question: the answer Name main differences between animal and plant cell. Chloroplasts Vacuole(s) wall Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
5 s from cells: mitochondria and chloroplasts s from cells: mitochondria and chloroplasts Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
6 Symbiogenesis s from cells: mitochondria and chloroplasts Small, rigid procaryotic cells became larger to escape from predators To keep all parts of larger cell communicable, they developed cytoplasm motility based on actin protein Cytoplasm motility allowed for phagocytosis so they became predators These predator cells captured many bacteria and digested them in lysosomes; they also developed nucleus to (a) guard DNA and (b) prevent the horizontal transfer of genes from alien organisms Some of prey were not digested (probably, by mistake) but were still useful because they provide ATP This condition were naturally selected, and these prey became mitochondria; mitochondria originated from purple bacteria Some mitochondial eukaryotes also captured cyanobacteria (plants 1 ) and became algae with chloroplasts Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
7 Plastids s from cells: mitochondria and chloroplasts Chloroplasts in leaf cells of Rhizomnium pseudopunctatum (LM 500) Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
8 Plastid structure s from cells: mitochondria and chloroplasts Tylacoids, stroma and starch granules (TEM 37, 500) Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
9 Scheme of plastid s from cells: mitochondria and chloroplasts Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
10 Grana s from cells: mitochondria and chloroplasts Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
11 Pigments s from cells: mitochondria and chloroplasts Chlorophylls (a and b) are photosynthetic lipids, including magnesium (Mg) Carotenoids facilitate photosynthesis, responsible for autumn colors Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
12 Chlorophylls a and b s from cells: mitochondria and chloroplasts Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
13 Mitochondria s from cells: mitochondria and chloroplasts Mitochondrion showing foliate cristae and matrix granules. Mitochondria are the main energy source (in form of ATP) of the cell (TEM) Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
14 boundaries boundaries Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
15 wall 1 boundaries Root cells of an onion showing the cell wall (TEM 47, 000) Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
16 wall 2 boundaries ulose fibers in the plant cell wall (SEM) Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
17 boundaries Primary and secondary cell walls Primary cell wall consists mostly of cellulose and proteins, they are thin and flexible Secondary cell wall includes hydrophobic lignine and suberine; this inclusion leads to the death of cell. However, dead cells are very useful for plants Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
18 boundaries Secondary cell wall: molecules Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
19 Plasmodesmata 1 boundaries Plasmodesmata in a corn leaf between a mesophyll cell and a bundle sheath cell (TEM) Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
20 Plasmodesmata 2 boundaries E.R. = endoplasmic reticulum (endoplasmic network) Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
21 boundaries Vacuoles, osmosis and turgor pressure If cell vacuoles contain more concentrated solution of salts then water surrounding cell (i.e., water outside is hypotonic), water will flow inside a cell. It is called osmosis wall prevents cell from explosion due to high turgor pressure When water flows outside a cell, cell content will shrink: this is plasmolysis Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
22 Symplast and apoplast boundaries Symplast name for continuous cytoplasm in set of cells Apoplast space outside cell; area of considerable metabolic activity Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
23 boundaries Endoplasmatic reticulum (network), ER Rough endoplasmic reticulum with ribosomes along outer surface. Manufactures many proteins destined for secretion or for incorporation into membranes (TEM) Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
24 boundaries Goldgi apparatus (dictyosomes) 1 The Golgi is an organelle composed of stacks of flattened, membranous sacs mainly responsible for modifying, packaging, and sorting proteins that will be secreted or targeted to other organelles of the internal membrane system or to the plasma membrane Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
25 boundaries Goldgi apparatus (dictyosomes) 2 Golgi complex and smooth endoplasmic reticulum in a liver cell (TEM) Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
26 Protein synthesis Protein synthesis Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
27 Nucleus structure Protein synthesis Nuclear envelope Double layered membrane, filaments of protein lamin line inner surface and stabilize structure, inner and outer membranes connect to form pores Nucleoplasm Portion inside the nuclear envelope Nucleoli Dark staining bodies within nucleus, site for ribosome synthesis Chromosomes Store genetic information in nucleotide sequences, each chromosome consists of chain of nucleosomes (long DNA molecule and associated histone proteins) Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
28 Nucleus Protein synthesis A typical nucleus with a prominent nucleolus (TEM). Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
29 Nuclear pores Protein synthesis Freeze-fracture technique used to show nuclear pores. Nuclear pores are structures in the nuclear envelope that allow passage of certain materials between the cell nucleus and the cytoplasm (TEM 100, 000) Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
30 Nuclear pores and envelope Protein synthesis Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
31 Ribosomes Protein synthesis Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
32 Final question (2 points) Protein synthesis Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
33 Final question (2 points) Protein synthesis What is the difference between primary and secondary cell walls? Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
34 Summary Protein synthesis Chloroplasts and mitochondria are both results of symbiogenesis Vacuole, chloroplasts and cell wall are three most important cell parts specific to plants. There are two ways of moving things between plant cells: through symplast or through apoplast ER handles ribosomes and packages proteins Golgi apparatus guides the movement of proteins Nucleus stores and expresses genetic information Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
35 For Further Reading Protein synthesis A. Shipunov. Introduction to Botany [Electronic resource] Mode of access: Shipunov (MSU) Introduction to Botany. Lecture 10 September 21, / 33
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