Original video: https://youtu.be/4gm-xZx_t78
Delivered on: 9 OCTOBER 2023
This video provides a captivating introduction to the wonders of photosynthesis, exploring the fundamental role of light, pigments, and chlorophyll in capturing and converting solar energy. 🌿 We'll delve into the general concepts that underpin this essential biological process.
What you'll learn:
Photosynthesis in Green Plants: Understand the basic principles of photosynthesis, including the light-dependent reactions that occur within chloroplasts and the carbon fixation reactions that produce sugars.
The Nature of Light: We'll explore the dual nature of light as both a particle and a wave, and how photons carry energy that plants can harness.
Chlorophyll and Light Absorption: Discover the fascinating properties of chlorophyll, the primary pigment responsible for absorbing light energy, and how its excited state drives photosynthesis.
Photosynthetic Pigments: Learn about the diversity of pigments found in photosynthetic organisms, each with unique light-absorbing properties, and their roles in capturing a wider range of the light spectrum.
9.1 Photosynthesis in Green Plants
Within chloroplasts, chlorophylls absorb light energy for the oxidation of water, releasing oxygen and generating NADPH and ATP (thylakoid reactions).
NADPH and ATP are used to reduce carbon dioxide to form sugars (carbon fixation reactions, treated in Chapter 10).
9.2 General Concepts
Light behaves as both a particle and a wave, delivering energy as photons, some of which are absorbed and used by plants (Figures 9.1,9.2,9.3).
Light-energized chlorophyll may fluoresce or transfer energy to another molecule to drive chemical reactions (Figures 9.4, 9.10).
All photosynthetic organisms contain a mixture of pigments with distinct structures and light-absorbing properties (Figures 9.6, 9.7).
LIST OF KEY TERMS
1. absorption spectrum
2. accessory pigments
3. action spectrum
4. antenna complex
5. ATPase
6. ATP synthase
7. bacteriochlorophylls
8. bleached
9. carbon fixation reactions
10. carotenoids
11. CF0–CF1
12. charge-separated state
13. chemical potential
14. chlorophyll a/b antenna proteins
15. chlorophylls
16. cyclic electron flow
17. cytochrome b6f complex
18. cytochrome f
19. endosymbiosis
20. energy conversion efficiency
21. energy transfer
22. envelope
23. ferredoxin (Fd)
24. ferredoxin–NADP+ reductase (FNR)
25. FeSA
26. FeSB
27. Fe–S centers
28. FeSX
29. fluorescence
30. fluorescence resonance energy transfer
31. frequency
32. grana lamellae
33. integral membrane proteins
34. light energy
35. light-harvesting complex II (LHCII)
36. lowest excited state
37. non-Mendelian, or maternal, inheritance
38. Nonphotochemical quenching
39. oxygen-evolving complex (OEC)
40. P680
41. P700
42. P870
43. Pheophytin
44. photochemistry
45. Photoinhibition
46. photons
47. photophosphorylation
48. photoprotection
49. photosystems I and II (PSI and PSII)
50. plastocyanin (PC)
51. plastohydroquinone (PQH2)
52. proton motive force
53. Q cycle
54. quanta
55. quantum yield
56. quenched
57. reaction center complex
58. reactive oxygen species
59. Rieske iron–sulfur protein
60. singlet oxygen
61. stroma
62. stroma lamellae
63. thylakoid reactions
64. thylakoids
65. transit peptide
66. uncoupled
67. wavelength
68. xanthophylls
Video Timestamps:
0:00 Introduction
4:04 Introduction about the syllabus of the course
5:51 Introduction on the lesson of the semester and reference book
7:44 Quick test
12.32 General Concept: Properties of light in photosynthesis
16.43 Properties of light
17.35 Wavelength and energy
19.02 Wavelength and light colour
21.09 Concept of light as electromagnetic radiation
23.45 How light is created
27:20 Visible light spectrum
33:12 Duality nature of light, wave-particle duality
37:50 Absorption of photosynthetically active light changes the electronic states of chlorophyll
40:50 Properties of chlorophyll
46:39 Absorption spectrum
49:20 Chlorophyll excited state
51:00 Destiny excited chlorophyll
51:51 Photosynthetic pigment absorbs the light that powers photosynthesis
1:02:48 Spectrum of absorption chlorophyll pigment
1:06:10 Accessory pigments
1:07:20 Distribution of chlorophyll and other photosynthetic pigments
1:11:14 Key experiments in understanding photosynthesis
1:11:50 Schedule for the classes and practical
Location:
Faculty of Agriculture, Universiti Putra Malaysia
Fakulti Pertanian, Universiti Putra Malaysia, 43000 Seri Kembangan, Selangor
XPMM+9J Seri Kembangan, Selangor
2.9845517506267742, 101.73803356324866
Attribution 4.0 International — CC BY 4.0 - Creative Commons
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