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Enhancement of photosynthetic efficiency of C3 plants
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A new “Green revolution” is needed in world agriculture to increase crop yields for food and bioenergy, because gains from conventional breeding method are less than world population growth. Efforts to increase crop productivity must also consider global change. Carbon-dioxide, methane and other greenhouse gases in atmosphere leads to global warming. Photosynthesis is the single most effective natural regulator of carbon dioxide in the Earth’s atmosphere. It is timely to consider what new opportunities exist in the current “omics” era to engineer increases in photosynthesis. Significant enhancement of photosynthesis in several C3 plants like rice, wheat and potato occurs due to insertion of C4 genes into C3 plants. It has been suggested that the C4 pathway evolved from C3 ancestors as an adaptation to high light intensities, high temperatures, and dryness. The C4 plants have several important characteristics such as high photosynthetic rates, high growth rates, low rates of water loss and a specialized leaf structure, high yields and water & nitrogen-use efficiencies, by concentrating CO2 around Rubisco, C4 plants drastically reduce photorespiration and concentration Of CO2 to the vicinity of Rubisco in C4 plants favours the carboxylation of RuBP over its oxygenation. There are three major strategies to improve the photosynthetic efficiency of C3 plants, such as Improving the quality and quantity of rubisco, Increasing thermotolerance of Rubisco Activase, Increasing Co2 concentration around Rubisco to enhance catalytic rate of Rubisco and to minimize the photorespiration and Over expression of C4 genes. | Int.J.Curr.Microbiol.App.Sci 2019 8 3 775-786 EXCELLENT PUBLISHERS International Journal of Current Microbiology and Applied Sciences ISSN 2319-7706 Volume 8 Number 03 2019 Journal homepage http www.ijcmas.com Review Article https doi.org 10.20546 ijcmas.2019.803.095 Enhancement of Photosynthetic Efficiency of C3 Plants B.A. Sowjanya B.D. Narayana and S. Shreyas Department of Genetics and Plant Breeding University of Agricultural Sciences Dharwad-580005 India Corresponding author ABSTRACT Keywords Photosynthetic Efficiency of C3 Plants Green revolution Article Info Accepted 07 February 2019 Available Online 10 March 2019 A new Green revolution is needed in world agriculture to increase crop yields for food and bioenergy because gains from conventional breeding method are less than world population growth. Efforts to increase crop productivity must also consider global change. Carbon-dioxide methane and other greenhouse gases in atmosphere leads to global warming. Photosynthesis is the single most effective natural regulator of carbon dioxide in the Earth s atmosphere. It is timely to consider what new opportunities exist in the current omics era to engineer increases in photosynthesis. Significant enhancement of photosynthesis in several C3 plants like rice wheat and potato occurs due to insertion of C4 genes into C3 plants. It has been suggested that the C4 pathway evolved from C3 ancestors as an adaptation to high light intensities high temperatures and dryness. The C4 plants have several important characteristics such as high photosynthetic rates high growth rates low rates of water loss and a specialized leaf structure high yields and water nitrogen-use efficiencies by concentrating CO2 around Rubisco C4 plants drastically reduce photorespiration and concentration Of CO2 to the vicinity of Rubisco in C4 plants favours the carboxylation of RuBP over its oxygenation. There are three major strategies to improve the photosynthetic efficiency of C3 plants such as .
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