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首页> 外文期刊>Journal of Experimental Botany >Canopy CO exchange of two neotropical tree species exhibiting constitutive and facultative CAM photosynthesis, Clusia rosea and Clusia cylindrica.
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Canopy CO exchange of two neotropical tree species exhibiting constitutive and facultative CAM photosynthesis, Clusia rosea and Clusia cylindrica.

机译：表现出本构和兼性CAM光合作用的两种新热带树种的冠层CO交换，即玫瑰丛和丛枝。

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摘要

Photon flux density (PFD) and water availability, the daily and seasonal factors that vary most in tropical environments, were examined to see how they influenced expression of crassulacean acid metabolism (CAM) in 3-year-old Clusia shrubs native to Panama. Instead of the commonly used single-leaf approach, diel CO exchange was measured for whole individual canopies of plants in large soil containers inside a naturally illuminated 8.8 mpd chamber. In well-watered C. rosea, a mainly constitutive CAM species, nocturnally fixed CO contributed about 50% to 24 h carbon gain on sunny days but the contribution decreased to zero following overcast days. Nonetheless, CO fixation in the light responded in such a way that 24 h carbon gain was largely conserved across the range of daily PFDs. The response of C. rosea to drought was similarly buffered. A facultative component of CAM expression led to reversible increases in nocturnal carbon gain that offset drought-induced reductions of CO fixation in the light. Clusia cylindrica was a C plant when well-watered but exhibited CAM when subjected to water stress. The induction of CAM was fully reversible upon rewatering. C. cylindrica joins C. pratensis as the most unambiguous facultative CAM species reported in the genus CLUSIA:
机译：研究了光子通量密度（PFD）和水的可利用性，这些因子是热带环境中变化最大的每日和季节性因素，目的是研究它们如何影响巴拿马本地3岁的Clusia灌木中的克拉苏酸代谢（CAM）的表达。代替通常使用的单叶方法，在自然光照的8.8 mpd室内的大型土壤容器中，对整个植物冠层的diel CO交换进行了测量。在水分充足的玫瑰花（C. rosea）（主要为组成型CAM物种）中，夜间固定的CO在晴天时贡献了约50％至24 h的碳增加，但在阴天后该贡献降低为零。尽管如此，在光照条件下固定一氧化​​碳的反应方式是，在每天的PFD范围内，大部分时间都保留了24小时的碳增长。类似地，缓冲了玫瑰蔷薇对干旱的响应。 CAM表达的兼性成分导致夜间碳增加的可逆增加，抵消了干旱引起的光照下CO固定减少。水分充足时Clusia cylindrica是C植物，但在水分胁迫下却表现出CAM。补充水后，CAM的诱导是完全可逆的。 C. cylindrica与C. pratensis一起成为CLUSIA属中最明确的兼性CAM物种：

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