Chapter 19 auxin

Summary: early experiments in auxin research

Auxin is transported to lower side of a horizontally oriented oat coleoptile tip

Figure 19.27

Lateral redistribution of auxin during phototropism

Auxin stimulates the elongation of oat coleoptile sections

Kinetics of auxin-induced elongation and cell wall acidification in maize coleoptiles

Figure 19.23

Figure 19.3 Structure of auxins

Demonstration of polar auxin transport with radiolabelled auxin (B)

Figure 19.6

Simplified chemiosmotic model of polar auxin transport

Figure 19.20 Typical dose–response curve for IAA-induced growth

Figure 19.15 Structures of auxin transport inhibitors

Auxin transport inhibitors block secretion of PIN1 to the plasma membrane

In Arabidopsis, two types of transport proteins direct the flow of auxin

Figure 19.32 Current model for redistribution of auxin during gravitropism in maize roots

Figure 19.28 Perception of gravity by statocytes of Arabidopsis

Gravistimulation results in asymmetric auxin accumulation in lateral root cells

Figure 19.33

Figure 19.31 Microsurgery experiments showed that the root cap supplies a root growth inhibitor

Figure 19.30 Maize root bending toward a Ca2+-containing agar block

BR2 gene encodes a P-glycoprotein required for normal auxin transport in corn

Figure 19.7 Demonstration of the lack of gravity effects on basipetal auxin transport

The strawberry “fruit” is a swollen receptacle