Lecture 13 - 03:29 Thigmotropism...

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03:29 Thigmotropism Response of plants to touch – grows around something  Memory response  Tendrils of squash or cucumber – tough an outside surface Dark vs light  Extend growth during dark (remember which way to grow) Calcium response  Nastic Response Response of plants to stimulus  Don’t know where they are going -– curls up on itself  Ex: Venus flytrap – 2 trigger hairs must be hit within time slot for plant to close and trap  a fly Ex: Sundo – nastic response – same direction, curls up on itself Hydrotropism Response to water  Lotus – high response  Heliotropism Response of plants to solar movement  Sunflowers all face toward the sun Beginning of the summer, will shift toward sun End of summer, shifts to where sun shifts
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Circadium Rhythms Response of plants to 24 hour cycles Circa dium  Unique entertaining of plants Often around light or temperature Temperature independent  Memory to rhythm even when lacking “signals” Happens day and night Examples: Cycling of the leaves Prayer plant – looks like its praying when leaves close Open in bright sunlight Shamrock – does same thing The flower clock – each plant that is pictured, flowers at a certain time of day and night Can tell time of day by when plants flower Photoperiodism Flowering response to light Short day plants want long nights Long day plants want short nights Mums Plant responses to cope with stress
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This note was uploaded on 02/17/2012 for the course HORTI 120 taught by Professor Paterson during the Fall '11 term at Wisconsin.

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Lecture 13 - 03:29 Thigmotropism...

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