SI session Growth Regulators Topic 27, 28 Spring 2010

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Presentation transcript:

SI session Growth Regulators Topic 27, 28 Spring 2010 Biology SI session Growth Regulators Topic 27, 28 Spring 2010 Dr. Hughey’s Bio 3 (Lab.) Picture from http://www.photographersdirect.com/buyers/stockphoto.asp?imageid=1198796 Designed by Pyeongsug Kim ©2008 sibio@att.net

Designed by Pyeongsug Kim, ©2009 Growth factors Internal factor External factor Plant Hormones Light, Temperature, Gravity, Day length…etc Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009 Auxin -Plant Hormones -IAA(Indoleacetic acid) -Produced in _______ -________________ (remains dormant) shoot tip Leaf primordia, young leaves, developing seeds Inhibit axillary buds Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009 Auxin - Inhibit axillary buds (remains dormant) Apical Dominance _______________ -By hormone _____ -inhibitory influence of the apical bud upon lateral buds. Auxin Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009 In the experiment of Apical Dominance lanolin Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009 Auxin promotes the formation of __________________________. Lateral and Adventitious Roots Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009 Auxin prevents Abscission(leaf drop). Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009 Auxin promotes cell elongation in shoot. Auxin inhibits cell elongation in root. Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009 Auxin inhibits cell elongation in root. Auxin promotes cell elongation in shoot. Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009 _________ :jointlike thickening at the base of the petiole or petiolule. facilitates __________ movements e.g Pulvinus nyctinastic Nyctinasty, Thigmonasty Pulvinar movement -caused by changes in _____________ leading to a contraction or expansion of the parenchyma tissue. turgor pressure Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009 Tropism _______ - directional growth in response to an external stimulus. ___________ : the curving of a growing shoot toward light. Phototropism _____________ - the response to contact with a solid object. Thigmotropism ____________- the orientation of leaves and flowers to the sun. Heliotropism Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009 Phototropism ___________ - the curving of a growing shoot toward light. - In theory, cell elongation by the hormone: __________ Auxin Designed by Pyeongsug Kim, ©2009

Designed by Pyeongsug Kim, ©2009 ____________- the orientation of leaves and flowers to the sun. Heliotropism -by turgor pressure changes of the ________ pulvinus Designed by Pyeongsug Kim, ©2009

Thigmomorphogenesis- the alteration of plant growth patterns in response to mechanical stimuli. From Dr. Hughey’s Bio3 class slide

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