摘要：Global demand for food and bioenergy production has increased rapidly,while the area of arable land has been declining for decades due to damage caused by erosion,pollution,sea level rise,urban development,soil salinization,and water scarcity driven by global climate *** order to overcome this conflict,there is an urgent need to adapt conventional agriculture to water-limited and hotter conditions with plant crop systems that display higher water-use efficiency(WUE).Crassulacean acid metabolism(CAM)species have substantially higher WUE than species performing C3 or C4 *** plants are derived from C3 photosynthesis ***,it is extremely unlikely that the C3 or C4 crop plants would evolve rapidly into CAM photosynthesis without human ***,there is growing interest in improving WUE through transferring CAM into C3 ***,engineering a major metabolic plant pathway,like CAM,is challenging and requires a comprehensive deep understanding of the enzymatic reactions and regulatory networks in both C3 and CAM photosynthesis,as well as overcoming physiometabolic limitations such as diurnal stomatal *** advances in CAM evolutionary genomics research,genome editing,and synthetic biology have increased the likelihood of successful acceleration of C3-to-CAM ***,we first summarize the systems biology-level understanding of the molecular processes in the CAM ***,we review the principles of CAM engineering in an evolutionary ***,we discuss the technical approaches to accelerate the C3-to-CAM transition in plants using synthetic biology toolboxes.

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