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首页> 外文期刊>Trends in Plant Science >Evergreen trees do not maximize instantaneous photosynthesis [Review]
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Evergreen trees do not maximize instantaneous photosynthesis [Review]

机译:常绿乔木不能最大化瞬时光合作用[综述]

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摘要

The lifestyles of plants affect their approach to photosynthesis. The long-lived evergreen trees must cope with wide temporal variation in water and nutrient availability that herbaceous species largely avoid. Evergreen trees have thus evolved mechanisms to conserve water and nutrients, and to tolerate water and nutrient stress. However, some of these adaptations have a cost. For example, evergreen trees have lower rates of photosynthesis per unit nitrogen, which can be partly explained by the use of Rubisco for nitrogen storage and the higher internal resistance to CO2 diffusion. The high internal resistance to diffusion of CO2 in evergreen trees might be an unavoidable consequence of anatomical and biochemical traits associated with leaf longevity, nutrient conservation and/or drought tolerance.
机译:植物的生活方式会影响其光合作用的方式。长寿的常绿乔木必须应对水和养分可利用性随时间的广泛变化,而草本物种在很大程度上要避免这种变化。因此,常绿乔木已经进化出保护水和养分,以及耐受水和养分胁迫的机制。但是,其中一些改编是有成本的。例如,常绿乔木每单位氮的光合作用速率较低,这可以部分归因于使用Rubisco进行氮存储和对CO2扩散的较高内部阻力。常绿乔木对二氧化碳扩散的高内部抗性可能是与叶片寿命,养分保存和/或干旱耐受性相关的解剖和生化特征的不可避免结果。

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