Plants in the shade
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Rescooped by Shawn Behling from Plant Biology Teaching Resources (Higher Education)
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Plant vs iPhone, via @HowPlantsWork

Plant vs iPhone, via @HowPlantsWork | Plants in the shade | Scoop.it

We often introduce topics in plant biology by drawing analogies to similar processes in animals. This approach works because it connects something familiar to the new material, which is important for understanding and retention.  As an example, we might talk about photoreceptors in the eye to introduce phytochrome and other plant photoreceptors.

 

Here's another approach that works equally well, and has the advantage of being a little different, and a little techy / geeky - "Which is more intellegent? An iPhone or a plant?" from the blog How Plants Work (www.howplantswork.com/). It covers topics including light sensors, proximity sensors, accelerometers and gyroscopes / gravity sensors. What a great way to start off your fall semester courses!

 

(I'm an android user, but I guess they're not very different inside? iPhone is to android as what is to what - Arabidopsis to maize?) ( I hear a more accurate comparison would be as Oryza sativa japonica is to Oryza sativa indica....)

 

The blog post is in four parts:

 

http://www.howplantswork.com/2010/06/21/which-is-more-intelligent-an-iphone-or-a-plant/

http://www.howplantswork.com/2010/06/25/which-is-more-intelligent-an-iphone-or-a-plant-part-2/

http://www.howplantswork.com/2010/06/26/which-is-more-intelligent-an-iphone-or-a-plant-part-3/

http://www.howplantswork.com/2010/06/28/which-is-more-intelligent-an-iphone-or-a-plant-part-4/


Via Mary Williams
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Rescooped by Shawn Behling from Arabidopsis
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DAD2 Is an α/β Hydrolase likely to Be Involved in the Perception of the Plant Branching Hormone, Strigolactone

DAD2 Is an α/β Hydrolase likely to Be Involved in the Perception of the Plant Branching Hormone, Strigolactone | Plants in the shade | Scoop.it

Strigolactones are a recently discovered class of plant hormone involved in branching, leaf senescence, root development, and plant-microbe interactions [1,2,3,4,5,6]. They are carotenoid-derived lactones, synthesized in the roots and transported acropetally to modulate axillary bud outgrowth (i.e., branching) [1,2]. However, a receptor for strigolactones has not been identified. We have identified the DAD2 gene from petunia, an ortholog of the rice and Arabidopsis D14 genes, and present evidence for its roles in strigolactone perception and signaling. DAD2 acts in the strigolactone pathway, and the dad2 mutant is insensitive to the strigolactone analog GR24. The crystal structure of DAD2 reveals an α/β hydrolase fold containing a canonical catalytic triad with a large internal cavity capable of accommodating strigolactones. In the presence of GR24 DAD2 interacts with PhMAX2A, a central component of strigolactone signaling, in a GR24 concentration-dependent manner. DAD2 can hydrolyze GR24, with mutants of the catalytic triad abolishing both this activity and the ability of DAD2 to interact with PhMAX2A. The hydrolysis products can neither stimulate the protein-protein interaction nor modulate branching. These observations suggest that DAD2 acts to bind the mobile strigolactone signal and then interacts with PhMAX2A during catalysis to initiate an SCF-mediated signal transduction pathway.


Via GMI Vienna
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