Plantphys - Plant Responses Tropisms Plant growth toward or...

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    Plant Responses Plant Responses Tropisms Plant growth toward or away from a unidirectional stimulus is called a tropism Due to differential growth - Positive is towards stimulus - Negative is away from stimulus Phototropism - Light Gravitropism - Gravity Thigmotropism - Touch
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    Phototropism Phototropism Occurs because cells on the shady side of the stem elongate A pigment related to riboflavin thought to act as a photoreceptor when phototropism occurs - Auxin migrates to shady side of stem - Shady sides elongate faster than bright side
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    Gravitropism Gravitropism Auxin is responsible for: Positive gravitropism of roots Negative gravitropism of shoots When a plant is placed on its side, the stem grows upward, opposite of the pull of gravity Stems with root caps grow downward Root cells contain statoliths
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    Thigmotropism Thigmotropism Unusual growth due to contact with solid objects is called thigmotropism Coiling of tendrils Thigmomorphogenesis occurs
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Plantphys - Plant Responses Tropisms Plant growth toward or...

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