When activated, this switch can influence where in a cell the transporter PIN1, and subsequently the growth hormone auxin, ...

While auxin was already known to help control this process, ethylene's involvement was a new discovery. In experiments with thale cress (Arabidopsis thaliana)—a model plant often used in ...

Coordinated polar localization of auxin efflux carrier PIN1 by GNOM ARF GEF. Science 286, 316–318 (1999). Sutter, J. U. et al. Abscisic acid triggers the endocytosis of the arabidopsis KAT1 K+ ...

Just like phototropism, gravitropism is also caused by an unequal distribution of auxin. When a stem is placed horizontally, the bottom side contains more auxin and grows more - causing the stem ...

In a stem, the cells on the shaded side contain more auxin and grow longer than the cells on the light side. This causes the stem to grow towards the light. It is vital to note that the plant does ...