Angiosperm growth and development

Angiosperm growth and development - Chapter 16 Angiosperm...

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Chapter 16 – Angiosperm Growth and Development Six major kinds of plant “hormones”: auxins, gibberellins, cytokinins, ethylene,  brassinosteroids, and growth inhibitors  o “auxin,” “gibberellin,” or “cytokinin” – generic name referring to a group of substances  that cause the same physiological responses and are similar in chemical structure  o Many gibberellins are biologically active in that they elicit a physiological response in  a plant system (however, some have no biological activity) Dwarfism o If due to genetic mutation, can be perpetuated through selective breeding  o Homozygous recessive condition = dwarf plant  o Causes Reduced elongation of internodes (sections of stem between leaves)  Block in gibberellin production Application of gibberellin = “normal,” tall plants  o Le/Le  and  Le/le  are tall and  le/le  are dwarfed le/le  deficient in GA1, which is found in greater amounts in tall varieties 
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This note was uploaded on 09/08/2008 for the course BIO G 104 taught by Professor Chen,k.c during the Spring '06 term at Cornell.

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Angiosperm growth and development - Chapter 16 Angiosperm...

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