lecture+6--post

lecture+6--post - Outline Lecture 6: Hormones and responses...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Outline Lecture 6: Hormones and responses to environment • Hormones – Definition – Discovery and effects •Au x in • Cytokinin • Gibberellin • Abscisic acid • Ethylene • New hormones? • Responses to environmental cues – Light
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Fig. 15-9, p. 243 auxin in block replaces tip growth resumes auxin transported down into agar block tip removed growth stops auxin source on one side growth on one side curvature proportional to auxin concentration Auxin discovery involved these steps: 1) The shoot tip is necessary for growth 2) There’s an actual physical substance being made in the shoot tip that can be transferred to an agar, and thence back to the plant 3) That substance definitely causes growth, because if differentially distributed, growth favors the side exposed more to the substance in question. 4) Voila! Auxin was discovered!
Background image of page 2
3 Lonicera fragrantissima cuttings, +++ auxin, + auxin, - auxin. Credit: © Robert Lyons/Visuals Unlimited 304765 One effect of auxin—root initiation in stem cuttings. Note that the plant on the right was given no auxin, while those on the left were given different levels of auxin and consequently had different amounts of root
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/17/2010 for the course BIS 1C BIS 1C taught by Professor Elizabeth during the Summer '08 term at UC Davis.

Page1 / 23

lecture+6--post - Outline Lecture 6: Hormones and responses...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online