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Auxin Flashcards

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273744455Chemical 1AA (A)-tip of root or shoot control the rate of growth -aromatic ring, a carboxyl group with 1 carbon removed so you have a free ortho position -negative charge on the carboxyl, positive on the ring -cell growth -pH 5.5-nuetral0
273744456Experiment Results (A)-light dependent -produce in stem -diffusible -polar transport-assymetrical growth1
273744457Synthesis (A)tryptophan-->indole pyruvic acid----> indole aldehyde---->indole acetic acid2
273744458Transport (A)1AAH--->1AA--->diffusion in cytosol/effux as an anion---> plamadesmata--->other cell -apical end--->basal end (shoot apical meristem on down)3
273744459Cell Wall Growth (A)-acid wall growth: auxin increases H efflux loosen wall and due to turgor extends -auxin stimulates proteins and activate expansins4
273744460Phototrophism (A)-response due to light -blue light is important due to flavin receptor -unilateral growth bc more growth on dark side which leads to bending5
273744461Gravitropism (A)-directional growth determined by gravity -percieved in the root tip -amyloplast interacts with ER -high auxins=curving down6
273744462Promotes Rooting (A)root forms off the stem called advantageous roots7
273744463Apical Dominance (A)-christmas tree -shoot apical meristem inhibits growth of lateral branches -@ top low cytokinins n high auxin -@ bottom high cytokinins n low auxins8
273744464Regulate Fruit Set (A)-makes fruits look swollen, plumper n9
273744465Application of Auxin-weed killers (agent orange) -Tissue culture -Seedless Fruits10
273744466GA chemical Nature-Diterpenes(19-20 C) -4-5 rings -carboxyl side chain11
273744467GA Discovery-Fungus infected plants and grew very tall, later isolated12
273744468GA synthesis-mevalonic acid--->kavernoic acid--->GA12 aldehyde--->all other GA -occurs plastid, ER, cytosol13
273744469Stem Elongation GA-in dwarf plants -decreases stem thickness14
273744470Bolting in Long Day Plants GA-some rosesette plants bolt(flower) in longer days -substitute daylength requirement -AMO GA inhibitor15
273744471Increase amylase GA-increases hydrolysis of starch -provides glucose & sugar that lower water potential and force water intake -provide energy through cell respiration -provide material to build cell walls like auxin -increase cell wall plasticity16
273744472Modification of Juvenility GA-many prenatal plants do not flower before they reach a certain maturity -GA3 regulates in either direction ie going from maturity to juvenility17
273744473Induction of Males Flowers GA-Male flower production increases by GA -monoecious & dioecious18
273744474Fruit Set & Growth GA-delays senescense -improves fruit set & growth19
273744475Seed Germination GA-water uptake increases GA synthesis -GA stimulate--->mRNA---> amylase production by aluerone -amylase breaks down starch n fuel the growth of embryo -GA substitue for the light requirement and decrease temp requirement20
273744476Enzyme Production during germination GA-important for malting(seed has to be at the right stage) -dwarfing for cereals anti GA-keeps plants short Chrysanthemum21
273744477Cytokinins chemical Nature-Kinetin like adenine -free nitrogenous base -nucleoside -nucleotide -glycoside(sugar)22
273744478Synthesis Ck-sites---> root apical meristem(transport in the xylem) & shoot apical meristem(transport in the phloem) -IP-->Adenine + 3-methyl-2-butenal23
273744479Control Morphogenesis Ck-developing shape -cytokinin: auxin ration shoots vs. root -callus @ intermediate level24
273744480Delay senescence CK-remain green for a longer time -creates sink and increases concentration which draw carbons in25
273744481Promotes Light-mediated chloroplast CKethioplast+ cytokinins---->in the dark=chloroplast26
273744482Promote Lateral Growth CK-opposes auxin, stimulate lateral growth27
273744483Crown GAll Infection CK-induces cells ti proliferate -enter through roots -plasmid that incorporate in the plant genome which overproduce auxin n cytokinin -if remove the auxin gene(Ti) then the ration of auxin n cytokinin will increase in shooty cells28
273744484Ethylene Chemical Nature-gas -inhibit growth -Ethrel converts to Ethylene(easier to work with)29
273744485Synthesis ETMethionine--->SAM-->ACC-->Ethylene -ACC rate determining step30
273744486Ripening ET-block SAM-->ACC -accelerates ripening of nearby fruits31
273744487Leaf Abscissions ET-decrease in auxin & GA -E release then release cellulase -cellulase digests cellulose allowing them to stretch--->pectin makes leaves fall which is due to break down of middle lamella32
273744488Epinasty ETadaxial > than abaxial occurs in flooding33
273744489Root hair formation ETrequires decrease concentration34
273744490Thigmomorphogeneses ETtouch wounding effect trigger growth reduction35
273744491Flower Senescence ETSTS bind with ethylene receptor=growth without u get no growth36
273744492ABA chemical nature-single compound -cis formation37
273744493ABA Synthesis-mevalonic acid pathway -breakdown carotenoids -oxygen sensitivity -conjugate with sugars -pH traps ABA anions -transport in xylem & phloem sites-->chloroplast and leaves38
273744494ABA Growth inhibitorinhibits GA inhibits shoot growth39
273744495Prevents seed germination ABA-Induces seeds to synthesize storage proteins -active, ABA makes dormant -dormant GA makes active40
273744496Stomatal Closure ABA-causes K to leave guard cells -increase in pH in xylem traps ABA in xylem and causes K to leave41

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