PLANTBI 40 Lecture Notes - Lecture 6: Coleoptile, Auxin, Apical Dominance
6 Aug 2018
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He discovered that there was something at the tip of the coleoptile that caused it to bend towards light. He first covered the tip of the plant with a foil and the plant had no response. Then, he covered the rest of the plant with sand and left the tip open and the plant ended up bending towards the light: fritz went proved there was something at the tip. Fritz went proved there was something at the tip by cutting off the tip of the coleoptile and placing it on an agar block to allow substances to diffuse from the coleoptile into the agar. He then put the agar block on top of a cut-off coleoptile either symmetrically (grew upwards) or asymmetrically (grew in curved direction). In that case, there must"ve been something in original tip that went into the agar to cause bending and growth in response to light.
