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I. Plant Hormones- A compound produced by one part of the plant. •. Hormones- A compound produced in one area of an organism and has an affect on an another area. •. A. Plants grow toward the light. •. 1. Phototropism- growth toward or away from the light. •. 2. Shoot toward light= positive. •. 3. Differential growth of cells
Plant Growth Regulators. A hormone is a naturally produced chemical synthesized in one part of the plant and then travels to another part where it effects growth and development. There are five main groups: ? Auxin or Indole Acetic Acid (IAA). ? Gibberellin or Gibberellic Acid (GA). ? Cytokinin (Ck). ? Ethylene (C. 2. H. 4. ).
HORMONES, GROWTH SUBSTANCES AND GROWTH REGULATORS. Some chemicals occurring naturally within plant tissues (i.e. endogenously), have a regulatory, rather than a nutritional role in growth and development. These compounds, which are generally active at very low concentrations, are known as plant
PLANT HORMONES-Introduction. By convention hormone are said to be a substances whose site of synthesis and site of action are different; the two events are separated by space and time. Hormones are known to elicit specific responses. Charles Darwin first demonstrated the existence of such substances in plants.
Thimann (1948) designated the plant hormones by the term 'phytohormones' in order to distinguish them from animal hormones. He defined a phytohormone as “an organic compound produced naturally in higher plants, controlling growth or other physiological functions at a site remote from its place of production and
1. Plant hormones: a. produced in many parts of the plant b. have many functions. Illustrated with 4 plant hormones: • Gibberellins. • Auxin. • Cytokinins. • Ethylene. Gibberellins. • Gibberellins illustrate how plant hormones have multiple roles related to different aspects of plant life. • And are produced in at multiple parts of.
PLANT HORMONES. 12 AUGUST 2015. Section A: Summary Notes. Growth is the increase in size of plants. Cell division occurs and the cells differentiate in order to develop. Growth and development is affected by: internal factors such as hormones external stimuli such as water, light, gravity, gases and contact. The word
Plant Responses to Environmental Cues. Phototropism - plant growth response to light shoots bend toward light - positive phototropism roots sometimes bend away from light - negative phototropism allows shoots to capture more light mediated by the plant hormone auxin. Gravitropism - plant growth response to gravity.
Home > Printer-friendly PDF > Printer-friendly PDF. Chapter 9 - Plant hormones : chemical signalling in plant development. [1]. Perception of gibberellin in germinating cereals. Protoplasts. (P) isolated from aleurone cells of wild oat (Avena fatua) were incubated with Sepharose beads (S) to which gibberellin molecules had
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