13069719
Description
Flashcards by J yadonknow, updated more than 1 year ago
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Created by J yadonknow
about 6 years ago
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| Question | Answer |
| Important plant hormone classes + R location AGECBP | Auxins - IC Giberellins - IC Ethylene - IC Cytokinins - Cell surf. Brassinosteroids - Cell surf Photoreceptors - Cell surf BLUE IC Red |
| Auxins | Natural plant auxin is indoleacetic acid Produced in seed embryo, meristems of apical buds and young leaves |
| Auxin function | Stim. stem elongation, root growth + branching Enhances apical development Fruit development |
| Transport | A.T. unidirectional shoot-base Polar transport. |
| MOA (3) | Bind to Nuc. R, which is a ubiquitin L Binding promotes Ubiquitinylation + degradation of repressor protein Suppression of gene transcription is relieved |
| Apical Dominance | Apex of stem has actively growing apical bud Ap. bud suppresses lat. bud development/ branching Caused by Ap. bud producing auxin in abundance |
| Giberellins | Promote seed germination + growth of stems/roots (amylase/proteases) Flowering Break winter dormancy |
| Transport | Cell to cell transport Can act locally (paracrine) or on distant sites |
| MOA | Binds to cyto R, a ubiquitin L Hormone/R complex then translocates to nucleus Repressor protein is ubiquitinylated, degraded, and transcription proceeds |
| Effects | Turns dwarf plants to normal Makes seedless grapes huge, removing seeds removes gibberellin makes fruit growth retarded |
| Ethylene | Found in ripening fruit/ ageing leaves/flowers |
| Functions | Promotes fruit ripening Blocks auxin and promotes leaf abscission + flower senescence Response to mechanical stress |
| Transport | Pass through CW/air via diffusion |
| MOA | Ethylene R in ER/Golgi membrane W/O ethylene, R +'s KB-> + molecule C - of ethylene R prevents KB action, allows C to + D which influences transcription |
| Common plant kinase | Serine/threonine |
| Cytokinins | All over the place the cheeky slags |
| Functions | *** Promotes Cell / *** Inhibits leaf senescence Promotes auxiliary bud growth Chloro differentiation |
| Transport | Long distance / paracrine |
| MOA | + promotion of cytokinin-sensitive gene expression L binding = + of kinase dom. of AHK R (Arabdopsis histidine kinase) IM AHP protein +pi His of ARR TF ARR +, gene transcription occurs |
| Regulating cell cycle w/ cytokinins | Histidine kinase use phosphate transfer |
| Brassinosteroids | All over the place, slags as well |
| Brassinosteroids function | Promote xylem differentiation Pt growth Seed germination Apical dominance Leaf senescence cell elongation Cell / in shoots |
| Transport | Cell to cell, paracrine, don't travel |
| MOA | Bind to cell surf R when has K activity Induces signal cascade Ultimately - an inhibitory K of a TF that activates brassinosteroid sensitive genes. (So quite selfish) This can +Pi Tyr/ser/threonine |
| Photoreceptors-Blue light | Contain either cryptochromes/phototropin/zeaxathin as ph. pig Cell Surf R |
| Red light | Phytochromes IC R |
| Phytochrome | 2 SU that etect red light Portion w/ chromophore for light detection Kinase domain for catalysis |
| MOA | Resides in cyto Detects red light Translocates to nucleus modulates gene transcription by Directly binding and + TF Indirectly by +Pi TF |
| GPCR Plants vs. Humans | |
| GCR1/GPA1 knockout mutation | Viable, but weird phenotype |
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