Growth regulators All are small organics made in
- Slides: 112
Growth regulators All are small organics: made in one part, affect another part Treating a plant tissue with a hormone is like putting a dime in a vending machine. It depends on the machine, not the dime!
Auxin signaling Used "auxin-resistant" mutants to find genes involved in auxin signaling Many are involved in selective protein degradation! Some auxin receptors, eg TIR 1 are E 3 ubiquitin ligases!
Auxin signaling Some auxin receptors eg TIR 1 are E 3 ubiquitin ligases! Upon binding auxin they activate complexes targeting AUX/IAA proteins for degradation! AUX/IAA inhibit ARF transcription factors, so this turns on "early genes"
Auxin signaling Auxin receptors eg TIR 1 are E 3 ubiquitin ligases! Upon binding auxin they activate complexes targeting AUX/IAA proteins for degradation! AUX/IAA inhibit ARF transcription factors, so this turns on "early genes" Some early genes turn on 'late genes" needed for development
Auxin signaling ABP 1 is a different IAA receptor localized in ER • Activates PM H+ pump by sending it to PM & keeping it there
Auxin signaling ABP 1 is a different IAA receptor localized in ER • Activates PM H+ pump by sending it to PM & keeping it there • Does not affect gene expression!
Auxin & other growth regulators ABP 1 is a different IAA receptor localized in ER • Stimulates PM H+ pump by sending it to PM & keeping it there. • Does not affect gene expression! • Some "late genes" synthesize ethylene (normally a wounding response): how 2, 4 -D kills?
Auxin & other growth regulators • Some "late genes" synthesize ethylene (normally a wounding response): how 2, 4 -D kills? • Auxin/cytokinin determines whether callus forms roots or shoots
Cytokinins Discovered as factors which induce cultured cells to divide Haberlandt (1913): phloem chemical stimulates division
Cytokinins Discovered as factors which induce cultured cells to divide Haberlandt (1913): phloem chemical stimulates division van Overbeek (1941): coconut milk stimulates division
Cytokinins Discovered as factors which induce cultured cells to divide Haberlandt (1913): phloem chemical stimulates division van Overbeek (1941): coconut milk stimulates division Miller… Skoog (1955): degraded DNA stimulates division!
Cytokinins Discovered as factors which induce cultured cells to divide Haberlandt (1913): phloem chemical stimulates division van Overbeek (1941): coconut milk stimulates division Miller… Skoog (1955): degraded DNA stimulates division! Kinetin was the breakdown product
Cytokinins Discovered as factors which induce cultured cells to divide Haberlandt (1913): phloem chemical stimulates division van Overbeek (1941): coconut milk stimulates division Miller… Skoog (1955): degraded DNA stimulates division! Kinetin was the breakdown product Derived from adenine
Cytokinins Discovered as factors which induce cultured cells to divide Haberlandt (1913): phloem chemical stimulates division van Overbeek (1941): coconut milk stimulates division Miller… Skoog (1955): degraded DNA stimulates division! Kinetin was the breakdown product Derived from adenine Requires auxin to stimulate division
Cytokinins Requires auxin to stimulate division Kinetin/auxin determines tissue formed (original fig)
Cytokinins Requires auxin to stimulate division Kinetin/auxin determines tissue formed Inspired search for natural cytokinins Miller& Letham (1961) ± simultaneously found zeatin in corn Kinetin trans- Zeatin
Cytokinins Miller& Letham (1961) ± simultaneously found zeatin Later found in many spp including coconut milk Kinetin trans-Zeatin
Cytokinins Miller& Letham (1961) ± simultaneously found zeatin Later found in many spp including coconut milk Trans form is more active, but both exist (& work) Many other natural & synthetics have been identified
Cytokinins Many other natural & synthetics have been identified Like auxins, many are bound to sugars or nucleotides
Cytokinins Many other natural & synthetics have been identified Like auxins, many are bound to sugars or nucleotides Inactive, but easily converted
Cytokinin Synthesis Most cytokinins are made at root apical meristem & transported to sinks in xylem
Cytokinin Synthesis Most cytokinins are made at root apical meristem & transported to sinks in xylem Therefore have inverse gradient with IAA
Cytokinin Synthesis Most cytokinins are made at root apical meristem & transported to sinks in xylem Therefore have inverse gradient with IAA Why IAA/CK affects development
Cytokinin Synthesis Most cytokinins are made at root apical meristem & transported to sinks in xylem Therefore have inverse gradient with IAA Why IAA/CK affects development Rapidly metabolized by sink
Cytokinin Effects Regulate cell division • Need mutants defective in CK metabolism or signaling to detect this in vivo
Cytokinin Effects Regulate cell division • Need mutants defective in CK metabolism or signaling to detect this in vivo • SAM & plants are smaller when [CK]
• • Cytokinin Effects SAM & plants are smaller when [CK] Roots are longer!
• • Cytokinin Effects Usually roots have too much CK: inhibits division! Cytokinins mainly act @ root & shoot meristems
Cytokinin Effects Cytokinins mainly act @ root & shoot meristems Control G 1 -> S & G 2 -> M transition
• Cytokinin Effects Promote lateral bud growth
• • Cytokinin Effects Promote lateral bud growth Delay leaf senescence
• • • Cytokinin Effects Promote lateral bud growth Delay leaf senescence Promote cp development, even in dark
Cytokinin Receptors were identified by mutation Resemble bacterial 2 -component signaling systems
Cytokinin Action 1. Cytokinin binds receptor's extracellular domain
Cytokinin Action 1. Cytokinin binds receptor's extracellular domain 2. Activated protein kinases His kinase & receiver domains
Cytokinin Action 1. Cytokinin binds receptor's extracellular domain 2. Activated protein kinases His kinase & receiver domains 3. Receiver kinases His-P transfer relay protein (AHP)
Cytokinin Action 1. Cytokinin binds receptor's extracellular domain 2. Activated protein kinases His kinase & receiver domains 3. Receiver kinases His-P transfer relay protein (AHP) 4. AHP-P enters nucleus & kinases ARR response regulators
Cytokinin Action 4. AHP-P enters nucleus & kinases ARR response regulators 5. Type B ARR induce type A
Cytokinin Action 4. AHP-P enters nucleus & kinases ARR response regulators 5. Type B ARR induce type A 6. Type A create cytokinin responses
Cytokinin Action 4. AHP-P enters nucleus & kinases ARR response regulators 5. Type B ARR induce type A 6. Type A create cytokinin responses 7. Most other effectors are unknown but D cyclins is one effect.
Auxin & other growth regulators • Some "late genes" synthesize ethylene (normally a wounding response): how 2, 4 -D kills? • Auxin/cytokinin determines whether callus forms roots or shoots • Auxin induces Gibberellins
Gibberellins Discovered by studying "foolish seedling" disease in rice • Hori (1898): caused by a fungus
Gibberellins Discovered by studying "foolish seedling" disease in rice • Hori (1898): caused by a fungus • Sawada (1912): growth is caused by fungal stimulus
Gibberellins Discovered by studying "foolish seedling" disease in rice • Hori (1898): caused by a fungus • Sawada (1912): growth is caused by fungal stimulus • Kurosawa (1926): fungal filtrate causes these effects
Gibberellins Discovered by studying "foolish seedling" disease in rice • Kurosawa (1926): fungal filtrate causes these effects • Yabuta (1935): purified gibberellins from filtrates of Gibberella fujikuroi cultures
Gibberellins Discovered by studying "foolish seedling" disease in rice • Kurosawa (1926): fungal filtrate causes these effects • Yabuta (1935): purified gibberellins from filtrates of Gibberella fujikuroi cultures • Discovered in plants in 1950 s
Gibberellins Discovered in plants in 1950 s • "rescued" some dwarf corn & pea mutants
Gibberellins Discovered in plants in 1950 s • "rescued" some dwarf corn & pea mutants • Made rosette plants bolt
Gibberellins Discovered in plants in 1950 s • "rescued" some dwarf corn & pea mutants • Made rosette plants bolt • Trigger adulthood in ivy & conifers
Gibberellins • "rescued" some dwarf corn & pea mutants • Made rosette plants bolt • Trigger adulthood in ivy & conifers • Induce growth of seedless fruit
• • • Gibberellins "rescued" some dwarf corn & pea mutants Made rosette plants bolt Trigger adulthood in ivy & conifers Induce growth of seedless fruit Promote seed germination
• • • Gibberellins "rescued" some dwarf corn & pea mutants Made rosette plants bolt Trigger adulthood in ivy & conifers Induce growth of seedless fruit Promote seed germination Inhibitors shorten stems: prevent lodging
Gibberellins • "rescued" some dwarf corn & pea mutants • Made rosette plants bolt • Trigger adulthood in ivy & conifers • Induce growth of seedless fruit • Promote seed germination • Inhibitors shorten stems: prevent lodging • >136 gibberellins (based on structure)!
Gibberellins >136 gibberellins (based on structure)! • Most plants have >10
Gibberellins >136 gibberellins (based on structure)! • Most plants have >10 • Activity varies dramatically!
Gibberellins >136 gibberellins (based on structure)! • Most plants have >10 • Activity varies dramatically! • Most are precursors or degradation products
Gibberellins >136 gibberellins (based on structure)! • Most plants have >10 • Activity varies dramatically! • Most are precursors or degradation products • GAs 1, 3 & 4 are most bioactive
Gibberellin signaling Used mutants to learn about GA signaling
Gibberellin signaling Used mutants to learn about GA signaling • Many are involved in GA synthesis
Gibberellin signaling Used mutants to learn about GA signaling • Many are involved in GA synthesis • Varies during development
Gibberellin signaling Used mutants to learn about GA signaling • Many are involved in GA synthesis • Varies during development • Others hit GA signaling • Gid = GA insensitive
Gibberellin signaling Used mutants to learn about GA signaling • Many are involved in GA synthesis • Varies during development • Others hit GA signaling • Gid = GA insensitive • encode GA receptors
Gibberellin signaling Used mutants to learn about GA signaling • Many are involved in GA synthesis • Varies during development • Others hit GA signaling • Gid = GA insensitive • encode GA receptors • Sly = E 3 receptors
Gibberellin signaling Used mutants to learn about GA signaling • Many are involved in GA synthesis • Varies during development • Others hit GA signaling • Gid = GA insensitive • encode GA receptors • Sly = E 3 receptors • DELLA (eg rga) = repressors of GA signaling
Gibberellins GAs 1, 3 & 4 are most bioactive Act by triggering degradation of DELLA repressors
Gibberellins GAs 1, 3 & 4 are most bioactive Made at many locations in plant Act by triggering degradation of DELLA repressors w/o GA DELLA binds & blocks activator (GRAS)
Gibberellins Act by triggering degradation of DELLA repressors w/o GA DELLA binds & blocks activator bioactive GA binds GID 1; GA-GID 1 binds DELLA & marks for destruction
Gibberellins Act by triggering degradation of DELLA repressors w/o GA DELLA binds & blocks activator bioactive GA binds GID 1; GA-GID 1 binds DELLA & marks for destruction GA early genes are transcribed, start GA responses
Gibberellins & barley germination GA made by embryo diffuse to aleurone & trigger events leading to germination
GA & stem elongation GA increase elongation, but lag >>> IAA
GA & stem elongation GA increase elongation, but lag >>> IAA Increase cell wall creepage, but don't change p. H (much)
GA & stem elongation GA increase elongation, but lag >>> IAA Increase cell wall creepage, but don't change p. H (much) Part of effect is increased expansin gene expression
GA & stem elongation GA increase elongation, but lag >>> IAA Increase cell wall creepage, but don't change p. H (much) Part of effect is increased expansin gene expression Another part is increased cell division
GA & other hormones GA interacts w many other hormones t/o plant life cycle
GA & other hormones GA interacts w many other hormones t/o plant life cycle + with auxin via DELLA & induction of GA synthesis
GA & other hormones GA interacts w many other hormones t/o plant life cycle + with auxin via DELLA & induction of GA synthesis - with cytokinins via reciprocal effects on synthesis
GA & other hormones GA interacts w many other hormones t/o plant life cycle + with auxin via DELLA & induction of GA synthesis - with cytokinins via reciprocal effects on synthesis - with ABA via Myb & DELLA
ABA Discovered as inhibitor of auxin –induced elongation (inhibitor b). Also found lots in tissues going dormant (dormin) Also found chemicals from senescing leaves & fruits that accelerated leaf abscission (abscission II) Was abscisic acid
ABA Counteracts GA effects • Causes seed dormancy & inhibits seed germination • Inhibits fruit ripening
ABA Also made in response to many stresses. Most is made in root & transported to shoot
ABA Most is made in root & transported to shoot in response to stress Closes stomates by opening Ca then closing K channels
ABA Synthesized during seed maturation to promote dormancy Also closes stomates in stress by opening Ca then closing K channels Induces many genes (~10% of total) via several different mechs 1. b. ZIP/ABRE (ABI 3, 4, 5 + AREBs)
ABA Synthesized during seed maturation to promote dormancy Also closes stomates in stress by opening Ca then closing K channels Induces many genes (~10% of total) via several different mechs 1. b. ZIP/ABRE (ABI 3, 4, 5 + AREBs) 2. MYC/MYB
ABA Induces many genes (~10% of total) via several different mechs 1. b. ZIP/ABRE (ABI 3, 4, 5 + AREBs) 2. MYC/MYB Jae-Hoon Lee has found 3 DWA genes that mark ABI 5 (but not MYC or MYB) for destruction
TAIZ-Zeiger version of ABA signaling 3 groups of receptors 1. GTG in PM • Resemble GPCR
TAIZ-Zeiger version of ABA signaling 3 groups of receptors 1. GTG in PM • Resemble GPCR • IP 3 has role in ABA • Unclear if GTG cause IP 3 production
TAIZ-Zeiger version of ABA signaling 3 groups of receptors 1. GTG in PM 2. CHLH in Cp • Also catalyzes Chl synthesis
TAIZ-Zeiger version of ABA signaling 3 groups of receptors 1. GTG in PM 2. CHLH in Cp • Also catalyzes Chl synthesis • And signals cp damage to nucleus
TAIZ-Zeiger version of ABA signaling 3 groups of receptors 1. GTG in PM 2. CHLH in Cp 3. PYR/PYL/RCAR • cytoplasmic
Schroeder version of ABA signaling 1. PYR/PYL/RCAR is key player • Binds ABA& inactivates PP 2 C
Schroeder version of ABA signaling 1. PYR/PYL/RCAR is key player • Binds ABA& inactivates PP 2 C • Allows Sn. RK 2 to function
Schroeder version of ABA signaling 1. PYR/PYL/RCAR is key player • Binds ABA& inactivates PP 2 C • Allows Sn. RK 2 to function • Sn. RK 2 then kinases many targets, including ion channels, TFs & ROS producers
ABA signaling in Guard Cells
Ethylene A gas that acts as a hormone! Chinese burned incense to ripen pears 1864: leaks from street lamps damage trees Neljubow (1901): ethylene causes triple response: short stems, swelling & abnormal horizontal growth
Ethylene A gas that acts as a hormone! Chinese burned incense to ripen pears 1864: leaks from street lamps damage trees Neljubow (1901): ethylene causes triple response: short stems, swelling & abnormal horizontal growth Doubt (1917): stimulates abscission Gane (1934): a natural plant product
Ethylene Effects Climacteric fruits produce spike of ethylene at start of ripening & exogenous ethylene enhances this
Ethylene Effects Climacteric fruits produce spike of ethylene at start of ripening & exogenous ethylene enhances this Results: 1) increased respiration 2) production of hydrolases & other enzymes involved in ripening
Ethylene Effects Normally IAA from leaf tip keeps abscission zone healthy
Ethylene Effects Normally IAA from leaf tip keeps abscission zone healthy When IAA abscission zone becomes sensitive to ethylene
Ethylene Effects Normally IAA from leaf tip keeps abscission zone healthy When IAA abscission zone becomes sensitive to ethylene Ethylene induces hydrolases & leaf falls off
Ethylene Synthesis Made in response to stress, IAA, or during ripening
Ethylene Synthesis Made in response to stress, IAA, or during ripening Use ACC or ethephon (which plants convert to ethylene) to synchronize flowering, speed ripening
Ethylene Synthesis Made in response to stress, IAA, or during ripening Use ACC or ethephon (which plants convert to ethylene) to synchronize flowering, speed ripening • Recent work shows ACC has own effects
Ethylene Synthesis Made in response to stress, IAA, or during ripening Use ACC or ethephon (which plants convert to ethylene) to synchronize flowering, speed ripening • Recent work shows ACC has own effects • Use silver & other inhibitors to preserve flowers & fruit
Ethylene Signaling Receptors were identified by mutants in triple response
Ethylene Signaling Receptors were identified by mutants in triple response Also resemble bacterial 2 -component signaling systems!
Ethylene Signaling Receptors were identified by mutants in triple response Also resemble bacterial 2 -component signaling systems! Receptor is in ER!
Ethylene Signaling 1. In absence of ethylene, receptors activate CTR 1 which represses EIN 2 -dependent signaling
Ethylene Signaling 1. In absence of ethylene, receptors activate CTR 1 which represses EIN 2 -dependent signaling 2. Upon binding ethylene, receptors inactivate CTR 1 by unknown mech
Ethylene Signaling 1. In absence of ethylene, receptors activate CTR 1 which represses EIN 2 -dependent signaling 2. Upon binding ethylene, receptors inactivate CTR 1 by unknown mech 3. Active EIN 2 activates EIN 3
Ethylene Signaling 1. In absence of ethylene, receptors activate CTR 1 which represses EIN 2 -dependent signaling 2. Upon binding ethylene, receptors inactivate CTR 1 by unknown mech 3. Active EIN 2 activates EIN 3 4. EIN 3 turns on genes needed for ethylene response.
Ethylene Signaling 1. In absence of ethylene, receptors activate CTR 1 which represses EIN 2 -dependent signaling 2. Upon binding ethylene, receptors inactivate CTR 1 by unknown mech 3. Active EIN 2 activates EIN 3 4. EIN 3 turns on genes needed for ethylene response. 5. Ethylene receptor also turns off EIN 3 degradation
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