Tuesday, 5 April 2016


I wasn't here when we were learning about auxin due to some unforeseen circumstance, but, from what I can see from my peers' work they have done on auxin, I can gather that auxin is a hormone that plants have, which causes plant cells to elongate in their shoots.  Auxin is involved in the regulation of plant growth.

In this presentation that Rita has done, it shows auxin in action.  Basically what is happening is that whilst the sun moves along in the sky and at the same time, auxin is being produced in the tip of the plant.  The side where the sun is not shining, is the side of the plant where the auxin travels.  Photo-tropism then occurs.  The cells in the side of the plant that the auxin is diffusing then starts to elongate.  Now, because the cells on the shadier part of the plant are longer than compared to the cells on the sunnier side (of the plant), the stem is then forced to lean over to where the sun is shining.

Credit to Rita for the presentation.

1 comment:

  1. Sela this is a BRILLIANT explanation! Now we just need to catch you up on how auxin works differently in root cells, to respond to gravity and help shoots and roots grow the right way out of seeds.