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Chapter 39 notes - 0 Chapter 39 ~ Plant Responses to...

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0. Chapter 39 ~ Plant Responses to Internal and External Signals Plant hormones 0. Hormone: chemical signals that coordinate parts of an organism; produced in one part of the body and then transported to other parts of the body; low concentrations 1. Tropism: movement toward or away from a stimulus 2. Went experiments (phototropism) 3. Hormone: auxin 4. Others: gravitropism, thigmotropism Auxin 1. IAA (indoleacetic acid) 2. Location: seed embryo; meristems of apical buds and young leaves 3. Function: stem elongation; root growth, differentiation, branching; fruit development; apical dominance; tropisms Cytokinins 4. Zeatin 5. Location: roots (and actively growing tissues) 6. Function: root growth and differentiation; cell division and growth; germination; delay senescence (aging); apical dominance (w/ auxin) Gibberellins 7. GA 3 8. Location: meristems of apical buds and roots, young leaves, embryo 9. Function: germination of seed and bud; stem elongation; leaf growth; flowering (bolting); fruit development; root growth and differentiation
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