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Wavelengths of light and photosynthetic pigments (article) | Khan Academy
Properties of light; Photons in photosynthesis. How chlorophylls and other pigments absorb light.
education  organic  chemistry  molecular  biology  photosynthesis  pigments  chlorophylls  photons  colour  reference 
7 weeks ago by asaltydog
Fixing photosynthesis by engineering it to recycle a toxic mistake
A number of researchers have come up with ideas for how to do better than the system that evolution left plants with. A variety of organisms metabolize these chemicals in different ways, and it's possible to mix and match enzymes to push the toxic chemical into a different pathway than the one plants normally use. The researchers tried two pathways that had been suggested by earlier research. One involved five genes taken from bacteria, while a second mixed and matched genes from pumpkin, Arabidopsis and E. coli.

The researchers also came up with a third simplified pathway of their own that involved two genes: one from the pumpkin and the second from a single-celled alga. Combined, the products of the two genes converted the toxic chemical into a compound called malate, which is used in a variety of biochemical pathways.

The simplified pathway avoided some of the problems with the two earlier efforts. Unlike the first pathway, both of the genes could be active in the chloroplast, the site where photosynthesis takes place. It also avoided the production of hydrogen peroxide, which is a byproduct of one of the reactions in the second pathway. To enhance things further, they also lowered the activity of a protein that normally transports the small, toxic byproduct out of the chloroplast, where photosynthesis takes place. The reasoning here is that they would trap it in the same compartment as the enzymes that acted on it, and the efficiency would go up.
by:JohnTimmer  from:ArsTechnica  genetics  agriculture  photosynthesis 
january 2019 by owenblacker
Synthetic glycolate metabolism pathways stimulate crop growth and productivity in the field | Science
New synthetic pathway spliced in to override native pathway to improve CO2 capture and reduce accidental O2 capture (and subsequent remediation metabolic cost), for a massive boost in photosynthesis efficiency. But this is for C3 plants, so C4 plants like rice/corn may not work?
C3  plant  GM  GMO  synthetic  photosynthesis  pathway 
january 2019 by asteroza

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