Cytokinin - Cytokinin Quiz question reviewAuxin cannot be...

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Cytokinin Quiz question review- Auxin cannot be transported up or down a stem. Auxin transport from shoots to roots is possible because of: Auxin exporters are localized on the bottom of cells In the presence of auxin, AUX/IAA proteins: Are degraded Cell Division Scientists try to “culture” plant cells like microorganism, but most plant cells do not divide after leaving the meristem Root cells will grow on synthetic media, but not shoot cells After wounding, shoot cells might divide several times then stop Infection with Agrobacterium tumefaciens causes continuous shoot cell growth creating a tumor of undifferentiated cells or callus Stem cells are capable of division but need a signal Some compounds induce shoot cell growth Old or heated DNA; coconut milk Cytokinin synthesis (Cytokine promotes shoot growth) Zeatin is formed when an isoprene unit added to an adenine base All natural cytokinins are derived from adenine “First committed step” of CK synthesis is catalyzed by isopentenyl transferase (IPT) CK can be conjugated to glucose CK glucosides are inactive and stored in seeds for use during germination CK are degraded by cytokinin oxidase (CKX) Cytokinin transport CK is produced everywhere and transported in phloem or xylem Most CK produced in the roots and transported to the shoots
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  • Spring '14
  • KennethFeldmann
  • Bacteria, callus, Cytokinins

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