Plant Structure And Growth - Mt. San Antonio College
Control Systems in Plants Plant Hormones Coordinates growth Coordinates development Coordinates responses to environmental stimuli Plant Hormones
Auxin (IAA) Cytokinins Gibberllins Abscisic Acid
Ethylene Oligogaccharins Brassinosteroids Auxins
Stimulates stem elongation Stimulates root growth Stimulates differentiation and branching Stimulates development of fruit Stimulates apical dominance Stimulates phototropism and gravitropism Auxin Control
Auxin stimulates growth Auxin block on right causes cells to elongate and the plant bends left Auxin block on left
causes cells to elongate the the plant bends right Polar Transport Auxin is transported from apex to shoot Cell wall is acidic
auxin ion picks up H+ diffuses across plasma membrane Cytosol is neutral
auxon loses H+ uses energy to pump out H+ to maintain pH leaves cell through carrier proteins Acid Growth Hypothesis
Proton pump stimulated by auxin which lower pH of wall Hydrogen Ion activates Enzyme Enzyme breaks hydrogen bonds in cellulose Wall takes up water and elongates Auxin Others
Promotes secondary growth by encouraging vascular cambium and secondary xylem Promotes adventitious root at the base of a cut stem Promotes fruit growth without pollination (seedless tomatoes) Cytokinins
Stimulates root growth Stimulates cell division and differentiation (with auxins) more cytokinin - shoot buds develop more auxin - roots develop
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