Gene expression and signal transduction
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Gene expression and signal transduction (4 hr ). - Basic of plant gene expression - Fundamental of plant signal transduction - Phytochrome and blue-light responses in plants. พืชมีระบบรับรู้ปัจจัยสิ่งแวดล้อม. การรับสัญญาณ (signal perception). การถ่ายทอดสัญญาณ (signal transduction).

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- Basic of plant gene expression - Fundamental of plant signal transduction

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Basic of plant gene expression fundamental of plant signal transduction

Gene expression and signal transduction (4 hr)

- Basic of plant gene expression

- Fundamental of plant signal transduction

- Phytochrome and blue-light responses in plants


Basic of plant gene expression fundamental of plant signal transduction

(signal perception)

(signal transduction)

(gene expression, responses)


Basic of plant gene expression fundamental of plant signal transduction

Receptors


Basic of plant gene expression fundamental of plant signal transduction

Molecular switches

active- inactive form

Five parallel intracellular signaling pathways activated by G-protein-linked receptors, receptor tyrosine kinases, or both

In this schematic example, the five kinases (shaded yellow) at the end of each pathway phosphorylate target proteins (shaded red), some of which are phosphorylated by more than one of the kinases. The specific phospholipase C activated by the two types of receptors is different: G-protein-linked receptors activate PLC-, whereas receptor tyrosine kinases activate PLC- (not shown).


Basic of plant gene expression fundamental of plant signal transduction

Second messenger


Basic of plant gene expression fundamental of plant signal transduction

lettuce


Basic of plant gene expression fundamental of plant signal transduction

Photomorphogenesis

http://www.uwsp.edu


Basic of plant gene expression fundamental of plant signal transduction

Photoreceptor:

Phytochrome

(red, far-red, blue light)


Basic of plant gene expression fundamental of plant signal transduction

Pfr: Ptotal


Basic of plant gene expression fundamental of plant signal transduction


Basic of plant gene expression fundamental of plant signal transduction

Smith H. Nature 407, 585-591


Basic of plant gene expression fundamental of plant signal transduction

Photomorphogenesis

  • + Light +

  • Light

Pfr: Ptotal

Pfr: Ptotal


Basic of plant gene expression fundamental of plant signal transduction

Figure 15-79. When activated by light, the phytochrome, which is a dimer, phosphorylates itself and then moves into the nucleus, where it activates gene regulatory proteins to stimulate the transcription of specific genes. (Alberts et al., 2002)


Basic of plant gene expression fundamental of plant signal transduction

http://www.bio.miami.edu/dana/226/226F09_14.html


Basic of plant gene expression fundamental of plant signal transduction

Jiao Y. et al. Nature Reviews Genetics 8, 217-230


Basic of plant gene expression fundamental of plant signal transduction

(Shadingavoidance)

Pfr: Ptotal

(Seed germination)

Pfr: Ptotal

(Sleep movement)

Pfr: Ptotal


Basic of plant gene expression fundamental of plant signal transduction

Figure 1.Photomorphogenesis as a morphological and as a cellular process. The left photos show the change in form of an Arabidopsis thaliana seedling grown in darkness (top) or in white light. The right hand illustration shows the change in chloroplast structure and diagrams the progress of light signals through two receptor systems, cryptochrome and phytochrome. Adapted from Biochemistry and Molecular Biology of Plants, (c) American Society of Plant Biologists, with permission.


Basic of plant gene expression fundamental of plant signal transduction

Blue light responses


Basic of plant gene expression fundamental of plant signal transduction


Basic of plant gene expression fundamental of plant signal transduction

Photoreceptor: blue light receptors

Cryptochrome

Phototropins

Zeaxanthins


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