apbio
Kacie Macalino
01/22/14
Chapter 31 Notes
31.1 - Plant Hormones Help Coordinate Growth, Development, & Responses to Stimuli
Hormone – travels in body fluids, and act on specific target cells in other parts of the body, changing the target cell’s functioning
Usually transported through the circulatory system
Plant hormones are produced in very low concentrations
A tiny amount can have a big effect on plant growth and development
Tropism – any growth response that results in a plant organs curving toward or away from stimuli
Phototropism – growth of a plant organ toward light or away from it
Positive phototropism directs shoot growth toward the sunlight that powers photosynthesis
Auxin – stimulates stem elongation
Auxin is combined in shoot tops and carries info on the development, size, and environment on each of the branches controlling its patterns
A reduce flow shows that the brand isn’t really productive and need to be elsewhere
Phyllotaxy – the arrangement of leaves on the stem
Cytokinins – affect root growth and differentiation
Control of Cell Division and Differentiation
Cytokinins are produced in actively growing tissues in roots, embryos, and fruits
Produced in roots reach their tissues by moving up the plant in the xylem sap
Cytokinins slow the aging of certain plant organs by stopping protein breakdown, refreshing RNA and proteins synthesis and moving nutrients from surrounding tissues
Gibberellins – promote seed and bud germination, stem elongation, and leaf growth
Gibberellins are best known for refreshing stem and leaf growth by enhancing cell elongation and cell division
Fruit growth; in many plants, auxin and gibberellins must be present for development
Brassinosteroids – inhibit root growth
Abscisic Acid – inhibits growth
Ethylene – gas that promotes fruit ripening, opposes some auxin effects
Triple response enables the shoot to avoid the obstacle
Senescence – the programmed death of certain cells or organs or the
01/22/14
Chapter 31 Notes
31.1 - Plant Hormones Help Coordinate Growth, Development, & Responses to Stimuli
Hormone – travels in body fluids, and act on specific target cells in other parts of the body, changing the target cell’s functioning
Usually transported through the circulatory system
Plant hormones are produced in very low concentrations
A tiny amount can have a big effect on plant growth and development
Tropism – any growth response that results in a plant organs curving toward or away from stimuli
Phototropism – growth of a plant organ toward light or away from it
Positive phototropism directs shoot growth toward the sunlight that powers photosynthesis
Auxin – stimulates stem elongation
Auxin is combined in shoot tops and carries info on the development, size, and environment on each of the branches controlling its patterns
A reduce flow shows that the brand isn’t really productive and need to be elsewhere
Phyllotaxy – the arrangement of leaves on the stem
Cytokinins – affect root growth and differentiation
Control of Cell Division and Differentiation
Cytokinins are produced in actively growing tissues in roots, embryos, and fruits
Produced in roots reach their tissues by moving up the plant in the xylem sap
Cytokinins slow the aging of certain plant organs by stopping protein breakdown, refreshing RNA and proteins synthesis and moving nutrients from surrounding tissues
Gibberellins – promote seed and bud germination, stem elongation, and leaf growth
Gibberellins are best known for refreshing stem and leaf growth by enhancing cell elongation and cell division
Fruit growth; in many plants, auxin and gibberellins must be present for development
Brassinosteroids – inhibit root growth
Abscisic Acid – inhibits growth
Ethylene – gas that promotes fruit ripening, opposes some auxin effects
Triple response enables the shoot to avoid the obstacle
Senescence – the programmed death of certain cells or organs or the