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Did early land plants use carbon-concentrating mechanisms?

机译:早期的陆地植物是否使用了碳浓缩机制?

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Carbon-concentrating mechanisms (CCMs) in plants involve actively increasing CO2 concentrations near ribulose-1,5-bisphosphate carboxylase oxygenase (RuBisCO). The assumption has been that terrestrial plants did not evolve CCMs for well over 300 million years, yet most marine plants probably evolved CCMs at the time when oxygenic photosynthesis first occurred in the Paleozoic. One primary reason for this assumption is that analysis of genetic mutations for phosphoenolpyruvate carboxylase (PEPc; an enzyme required for C4 and CAM photosynthesis) indicate a molecular age of no more than 65 Ma. Could the evolutionary response of both RuBisCO and PEPc to varying concentrations of atmospheric CO2 and O-2 over geological time have obscured the real time when land plants first used PEPc during photosynthesis
机译:植物中的碳浓缩机制(CCM)涉及积极增加1,5-双磷酸核糖羧化酶加氧酶(RuBisCO)附近的CO2浓度。假设陆生植物在超过3亿年中没有进化出CCM,但是大多数海洋植物可能是在古生代首次发生光合作用时才进化出CCM的。这种假设的一个主要原因是,对磷酸烯醇丙酮酸羧化酶(PEPc; C4和CAM光合作用所需的一种酶)的基因突变进行分析,表明其分子年龄不超过65 Ma。 RuBisCO和PEPc在地质时间内对大气中不同浓度的CO2和O-2的演化反应是否掩盖了陆地植物在光合作用中首次使用PEPc的实时性

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