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CONTROL OF FLOWERING

CONTROL OF FLOWERING. RESPONSE TO LIGHT FOR FLOWERING . LENGTH OF NIGHT CONTROLS SHORT-DAY & LONG-DAY PLANT FLOWERING PLANTS MUST FLOWER WHEN POLLINATORS ARE AVAILABLE & RESOURCES ARE PLENTIFUL PHYTOCHROMES (BLUE-GREEN PIGMENT) ARE CONTROLLED BY LIGHT. TROPISMS. GROWTH OR MOVEMENT

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CONTROL OF FLOWERING

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  1. CONTROL OF FLOWERING

  2. RESPONSE TO LIGHT FOR FLOWERING • LENGTH OF NIGHT CONTROLS SHORT-DAY & LONG-DAY PLANT FLOWERING • PLANTS MUST FLOWER WHEN POLLINATORS ARE AVAILABLE & RESOURCES ARE PLENTIFUL • PHYTOCHROMES (BLUE-GREEN PIGMENT) ARE CONTROLLED BY LIGHT

  3. TROPISMS • GROWTH OR MOVEMENT • RESPONSESTO DIRECTIONAL EXTERNAL STIMULI • COMMON STIMULI ARE CHEMICAL, GRAVITY TOUCH & LIGHT

  4. PHOTOTROPISIMDIRECTIONAL RESPONSE TO LIGHT • STEM RESPONSE IS + • ROOT RESPONSE IS – • IAA IS THE AUXIN THAT CAUSES + PHOTOTROPISM OF SHOOTS & SEEDLINGS • AUXINS IN SEED EMBRYOS, BUDS, & LEAF MERISTEM CAUSE MITOSIS

  5. AUXINS INCREASE FLEXIBILITY IN PLANT CELL WALLS IN YOUNG SHOOTS • THE RESPONSE IS CAUSED BY A REDISTRIBUTION OF AUXINS TO SIDE AWAY FROM LIGHT

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