Chemical Signals 1 BIOL 1407. Chemical Signals Cells use chemicals to communicate with other cells B1014B55BEF2322395D72133/neutrophil.

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Presentation transcript:

Chemical Signals 1 BIOL 1407

Chemical Signals Cells use chemicals to communicate with other cells B1014B55BEF D72133/neutrophil -chemotaxis.aspxhttp:// B1014B55BEF D72133/neutrophil -chemotaxis.aspx Photo Credit of Neutrophil engulfing anthrax bacteria: Tim Vickers, 2007, Wikimedia Commons

Chemical Signaling: Direct Contact

Chemical Signaling: Short-Distance

Chemical Signaling: Long- Distance

Chemical Signaling Between Individuals Pheromones Video of Orchid Wasp Mimic: atch?v=-h8I3cqpgnA atch?v=-h8I3cqpgnA Photo credit for Spined Soldier Bug eating Mexican Bean Beetle larvae: USDA, 2006, Wikimedia Commons Article on Spined Soldier Bug and his pheromones: s/cuttings-the-enemy-s-enemy-is-the- soldier- bug.html?partner=rssnyt&emc=rss&pag ewanted=all s/cuttings-the-enemy-s-enemy-is-the- soldier- bug.html?partner=rssnyt&emc=rss&pag ewanted=all

Signal Transduction Pathways

Receptors

Target Cells: Have Receptors for Signal

Target Cells and Specificity

Types of Hormones

Transport and Receptor Location

Water- Soluble Hormones

G Proteins

Second Messengers cAMP cGMP IP 3 and DAG Calcium Calmodulin

Lipid- Soluble Hormones

Steroid Hormones Brassinosteroids in plants Steroid hormones in animals –Synthesized from Cholesterol –Testosterone, Progesterone, Estrogens –Cortisol and Aldosterone from adrenal cortex

Seed Dormancy and Germination ABA –High levels inhibit germination = promotes dormancy Gibberellins –High levels promote seed germination

Al-your-ownskew-Tell-um

Trigger for Desert Seed Germination: Rain Photo Credit for Storm Over Western Ghats: PlaneMad, 2006, Wikimedia Commons

Desert Seed Germination Attenborough Video: – tube.com/watc h?v=z1IBnHIO Fxshttp:// tube.com/watc h?v=z1IBnHIO Fxs –Photo Credit for South Africa Desert in Bloom: Winfried Bruenicen, 2001, Wikimedia Commons

Volatile Chemicals Jasmonic Acid and Plant Volatiles Dodder plant seeks close relationship with tomato plant – u.edu/displayimage.ph p?pos=-19895http://imagearchive.ps u.edu/displayimage.ph p?pos= Photo Credit for Dodder in Bloom: Michael Becker, 2005, Wikimedia Commons

Photo Credit for Dodder on Acacia: Khalid Mahmood, 2007, Wikimedia Commons

Photo Credit for Parasitoid Wasp on Plant Bug Nymph: Scott Bauer, USDA, 2003, Wikimedia Commons

The End Unless otherwise specified, all images in this presentation came from: Campbell, et al Biology, 8 th ed. Pearson Benjamin Cummings.

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