{"id":109839,"date":"2019-01-04T03:40:40","date_gmt":"2019-01-04T03:40:40","guid":{"rendered":"https:\/\/www.bnreport.com\/a-new-way-to-genetically-tweak-photosynthesis-boosts-plant-growth\/"},"modified":"2019-01-04T03:40:40","modified_gmt":"2019-01-04T03:40:40","slug":"a-new-way-to-genetically-tweak-photosynthesis-boosts-plant-growth","status":"publish","type":"post","link":"https:\/\/www.bnreport.com\/en\/a-new-way-to-genetically-tweak-photosynthesis-boosts-plant-growth\/","title":{"rendered":"A new way to genetically tweak photosynthesis boosts plant growth"},"content":{"rendered":"

A genetic hack to make photosynthesis more efficient could be a boon for agricultural production, at least for some plants.<\/p>\n

This feat of genetic engineering simplifies a complex, energy-expensive operation that many plants must perform during photosynthesis known as photorespiration. In field tests, genetically modifying tobacco in this way increased plant growth<\/a> by over 40 percent. If it produces similar results in other crops, that could help farmers meet the food demands of a growing global population, researchers report in the Jan. 4 Science<\/em>.<\/p>\n

Streamlining photorespiration is \u201ca great step forward in efforts to enhance photosynthesis,\u201d says Spencer Whitney, a plant biochemist at Australian National University in Canberra not involved in the work.<\/p>\n

Now that the agricultural industry has mostly optimized the use of yield-boosting tools like pesticides, fertilizers and irrigation, researchers are trying to micromanage and improve plant growth by designing ways to make photosynthesis more efficient<\/a> (SN: 12\/24\/16, p. 6<\/em>).<\/p>\n

Photorespiration is a major roadblock to achieving such efficiency. It occurs in many plants, such as soybeans, rice and wheat, when an enzyme called Rubisco \u2014 whose main job is to help transform carbon dioxide from the atmosphere into sugars that fuel plant growth \u2014 accidentally snatches an oxygen molecule out of the atmosphere instead.<\/p>\n

That Rubisco-oxygen interaction, which happens about 20 percent of the time, generates the toxic compound glycolate, which a plant must recycle into useful molecules through photorespiration. This processes comprises a long chain of chemical reactions that span four compartments in a plant cell. All told, completing a cycle of photorespiration is like driving from Maine to Florida by way of California. That waste of energy can cut crop yields by 20 to 50 percent, depending on plant species and environmental conditions.<\/p>\n

Using genetic engineering, researchers have now designed a more direct chemical pathway for photorespiration that is confined to a single cell compartment \u2014 the cellular equivalent of a Maine-to-Florida road trip straight down the East Coast.<\/p>\n

Paul South, a molecular biologist with the U.S. Department of Agriculture in Urbana, Ill., and colleagues embedded genetic directions for this shortcut, written on pieces of algae and pumpkin DNA, in tobacco plant cells. The researchers also genetically engineered the cells to not produce a chemical that allows glycolate to travel between cell compartments to prevent the glycolate from taking its normal route through the cell.<\/p>\n

 Unlike previous experiments with human-designed photorespiration pathways, Souths team tested its photorespiration detour in plants grown in fields under real-world farming conditions. Genetically altered tobacco produced 41 percent more biomass than tobacco that hadnt been modified.\n<\/code><\/pre>\n
\u201cIts very exciting\u201d to see how well this genetic tweak worked in tobacco, says Veronica Maurino, a plant physiologist at Heinrich Heine University D\u00fcsseldorf in Germany not involved in the research, but \u201cyou cant say, Its functioning. Now it will function everywhere.\u201d<\/p>\n
Experiments with different types of plants will reveal whether this photorespiration fix creates the same benefits for other crops as it does for tobacco. Souths team is currently running greenhouse experiments on potatoes with the new set of genetic modifications, and plans to do similar tests with soybeans, black-eyed peas and rice.<\/p>\n
The vetting process for such genetic modifications to be approved for use on commercial farms, including more field testing, will probably take at least another five to 10 years<\/a>, says Andreas Weber, a plant biochemist also at Heinrich Heine University D\u00fcsseldorf who coauthored a commentary on the study that appears in the same issue of Science<\/em>. In the meantime, he expects that researchers will continue trying to design even more efficient photorespiration shortcuts, but Souths team \u201chas now set a pretty high bar.\u201d<\/p>\n
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