LAB__7_-_Plant_hormones_&_responses

LAB__7_-_Plant_hormones_&_responses - Plant Hormones...

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Plant Hormones and Responses Plant hormones or phytohormones – chemical messengers that regulate a plant’s growth have an effect on plant’s growth, tropisms, changes in plant parts, interaction between the plant’s life cycle and environment affect enzyme activity, protein synthesis or membrane permeability a plant response usually a result of interaction between 2 or more hormones
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APICAL MERISTEM – the undifferentiated tissue from which new cells are formed (the tips of roots or stems; the growing tip).
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MAIN PLANT HORMONES AUXIN (IAA = i ndole-3- a cetic a cid) GIBBERELLINS (GA) CYTOKININS (CK) ABSCISIC ACID (ABA) ETHYLENE
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AUXIN found in shoot apical meristem , young leaves, and embryo Stimulates cell elongation and root growth (low conc. only) Delays leaf senescence and fruit ripening Stimulates growth of flower parts and fruits Stimulates the production of ethylene at high conc. Can inhibit or promote (via ethylene stimulation) leaf and fruit abscission Controls phototropism and geotropism (gravitropism) Promotes xylem differentiation
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GIBBERELLINS found in young leaves, meristems of apical buds and roots, embryo Promote stem elongation and leaf growth Promote seed and bud germination Stimulate flowering and development of fruit Affect root growth and differentiation
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