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Plant Growth and Regulation

Overview. regulation is a function of:environmental cuesgenetic makeupreceptorshormones. Hormones and Receptors. hormonephotoreceptors. Plant Development. dormancy ? germination ? growth and development ? flowering and fruiting ? deathsenescence. Hormonal Control. gibberellinsproduced by

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Plant Growth and Regulation

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    1. Plant Growth and Regulation

    2. Overview regulation is a function of: environmental cues genetic makeup receptors hormones

    3. Hormones and Receptors hormone photoreceptors

    4. Plant Development dormancy ? germination ? growth and development ? flowering and fruiting ? death senescence

    5. Hormonal Control gibberellins produced by apical meristem cells, embryo, and young leaves stem elongation fruit growth germination

    8. Auxin produced by apical meristem cells and young leaves mediates phototropic and gravitropic responses stimulates 1o growth of stems, inhibits 1o growth of roots inhibits leaf abscission maintains apical dominance

    13. Auxin controls some fruit development parthenocarpy

    15. Auxin transport is polar apex to base blade to petiole auxin carrier proteins

    16. Auxin phototropism auxin concentrates in cells on shaded side, causing differential elongation of cells gravitropism auxin concentrates in cells on lower side, causing differential growth

    18. Mechanism of Action loosens cell wall auxin stimulates proton pumps pump protons into cell wall expansins modify H bonds between cellulose molecules molecules slide past one another, allowing for elongation

    20. Cytokinins synthesized in roots stimulates bud formation aid in germination inhibit 1o growth in stems stimulates 2o growth in stems delays leaf senescence inhibits protein breakdown increases RNA synthesis

    21. Ethylene gaseous hormone produced in many plant parts (senescence hormone) fruit ripening promotes leaf abscission

    22. Abscicic Acid produced in terminal buds and maturing seeds (stress hormone) closes stomata inhibits growth enforces seed dormancy

    23. Plant Defense and Hormones oligosaccharins oligosaccharide derivatives released from cell walls when damaged trigger plant defenses against pathogens or predators oxidative burst jasmonates production initiated by systemin form a protease inhibitor

    25. Brassinosteroids normal growth and development of stems inhibits root elongation pollen tube growth

    26. Phytochromes photoreceptor proteins controls flowering and seed germination Pr Pfr

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