BIOL 104 Lecture Notes - Lecture 7: Seed Dormancy, Cytokinin, Plant Hormone
9 Mar 2020
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Laboratory exercise #7: part a - plant hormones & tropisms. Introduction: plant hormones (phytohormones) are also known as growth regulators, plant hormones, auxin, cytokinin, ethylene, abscisic acid (aba, gibberellins. Exercise #1: ethylene: plant growth regulator, gas that diffuses, ripening of fruit and influencing neighboring tissues and organs. Exercise #3: cytokinin: root tips; root growth; cell division, balances with auxin, high axuin + low cytokinin favors root formation. Low auxin + high cytokinin favors shoot formation. If you cut off the apical meristem, auxin is removed, causing an increase in cytokinin. This increase of cytokinin will cause axillary buds to grow, thus, making the plant bushier! Increased shoot formation (low auxin + high cytokinin: plant 4 - apical meristem removed but covered with auxin. Stem elongation: rosette formation, plant #1: control sprayed with h2o, plant #2: more rosette formation with the sprayed ga, plant #3: dwarf plant - shoot elongation with added ga, plant #4: dwarf control plant.
