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首页> 外文期刊>Annals of Botany >Crassulacean acid metabolism and fitness under water deficit stress: if not for carbon gain, what is facultative CAM good for?
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Crassulacean acid metabolism and fitness under water deficit stress: if not for carbon gain, what is facultative CAM good for?

机译:缺水胁迫下的十字绣花酸代谢和适应性:如果不是为了增加碳,那么兼性CAM有什么好处?

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摘要

Background In obligate Crassulacean acid metabolism (CAM), up to 99 % of CO2 assimilation occurs during the night, therefore supporting the hypothesis that CAM is adaptive because it allows CO2 fixation during the part of the day with lower evaporative demand, making life in water-limited environments possible. By comparison, in facultative CAM (inducible CAM, C3-CAM) and CAM-cycling plants drought-induced dark CO2 fixation may only be, with few exceptions, a small proportion of C3 CO2 assimilation in watered plants and occur during a few days. From the viewpoint of survival the adaptive advantages, i.e. increased fitness, of facultative CAM and CAM-cycling are not obvious. Therefore, it is hypothesized that, if it is to increase fitness, CAM must aid in reproduction.
机译:背景技术在专心的十字花酸代谢(CAM)中,高达99%的CO 2 同化作用发生在夜间,因此支持CAM具有适应性的假设,因为它允许CO 2 在一天中的固定时间内蒸发量较低,因此可以在水受限的环境中生活。相比之下,在兼性CAM(诱导型CAM,C 3 -CAM)和CAM循环植物中,干旱诱导的暗CO 2 固定可能只有一个, C 3 CO 2 在水生植物中的比例很小,并且在几天内就会发生。从生存的观点来看,兼性CAM和CAM循环的适应性优势,即增加适应性并不明显。因此,假设要提高适应性,CAM必须有助于生殖。

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  • 来源
    《Annals of Botany》 |2009年第4期|p.645-653|共9页
  • 作者

    Ana Herrera*;

  • 作者单位

    Instituto de Biología Experimental, Universidad Central de Venezuela, Calle Supure, Colinas de Bello Monte, Caracas 1041A, Venezuela;

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  • 正文语种 eng
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