Chapter 39 Plant Tropisms.

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Presentation transcript:

Chapter 39 Plant Tropisms

Opaque shield over curvature Figure 39.5 RESULTS Shaded side Control Light Illuminated side Boysen-Jensen Light Darwin and Darwin Figure 39.5 Inquiry: What part of a grass coleoptile senses light, and how is the signal transmitted? Light Gelatin (permeable) Mica (impermeable) Tip removed Opaque cap Trans- parent cap Opaque shield over curvature

Excised tip on agar cube Figure 39.6 RESULTS Excised tip on agar cube Growth-promoting chemical diffuses into agar cube Control (agar cube lacking chemical) Offset cubes Control Figure 39.6 Inquiry: Does asymmetrical distribution of a growth-promoting chemical cause a coleoptile to grow toward the light?

Primary root of maize bending gravitropically (LMs) (b) Figure 39.24 Statoliths 20 m Figure 39.24 Positive gravitropism in roots: the statolith hypothesis. (a) Primary root of maize bending gravitropically (LMs) (b) Statoliths settling to the lowest sides of root cap cells (LMs)

Figure 39.25 Figure 39.25 Altering gene expression by touch in Arabidopsis.

(a) Unstimulated state (b) Stimulated state Figure 39.26 (a) Unstimulated state (b) Stimulated state Side of pulvinus with flaccid cells Leaflets after stimulation Side of pulvinus with turgid cells Figure 39.26 Rapid turgor movements by the sensitive plant (Mimosa pudica). Pulvinus (motor organ) Vein 0.5 m (c) Cross section of a leaflet pair in the stimulated state (LM)