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首页> 美国卫生研究院文献>Journal of Experimental Botany >Canopy CO2 exchange of two neotropical tree species exhibiting constitutive and facultative CAM photosynthesis Clusia rosea and Clusia cylindrica
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Canopy CO2 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冠层CO2交换：玫瑰丛（Clusia rosea）和圆筒丛（Clusia cylindrica）

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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 CO2 exchange was measured for whole individual canopies of plants in large soil containers inside a naturally illuminated 8.8 m3 chamber. In well-watered C. rosea, a mainly constitutive CAM species, nocturnally fixed CO2 contributed about 50% to 24 h carbon gain on sunny days but the contribution decreased to zero following overcast days. Nonetheless, CO2 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 CO2 fixation in the light. Clusia cylindrica was a C3 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：检查了光子通量密度（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，以查看它们如何影响巴拿马本地3岁的克鲁索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，在自然照明的8.8 m 3 室内，在大型土壤容器中测量整个植物个体冠层的diel CO2交换。在主要构成性CAM物种的水分充足的C. rosea中，夜间固定的CO2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。但是，在光照下固定CO2的反应方式是，在每天的PFD范围内，大部分时间都保持24小时的碳增加。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二氧化碳固定的减少。水分充足时Clusia cylindrica是C3植物，但在水分胁迫下表现出CAM。补充水后，CAM的诱导是完全可逆的。 C. cylindrica与C. pratensis一样，是Clusia属中最明确的兼性CAM物种。

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