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Canopy CO2 exchange of two neotropical tree species exhibiting constitutive and facultative CAM photosynthesis, <I>Clusia rosea</I> and <I>Clusia cylindrica</I>

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dc.contributor.author Winter, Klaus en
dc.contributor.author Garcia, Milton N. en
dc.contributor.author Holtum, Joseph A. M. en
dc.date.accessioned 2011-04-21T16:40:16Z
dc.date.available 2011-04-21T16:40:16Z
dc.date.issued 2009
dc.identifier.citation Winter, Klaus, Garcia, Milton N., and Holtum, Joseph A. M. 2009. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F15966">Canopy CO2 exchange of two neotropical tree species exhibiting constitutive and facultative CAM photosynthesis, Clusia rosea and Clusia cylindrica</a>." <em>Journal of Experimental Botany</em>. 60 (11):3167&ndash;3177. <a href="https://doi.org/10.1093/jxb/erp149">https://doi.org/10.1093/jxb/erp149</a> en
dc.identifier.issn 0022-0957
dc.identifier.uri http://hdl.handle.net/10088/15966
dc.description.abstract 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. en
dc.relation.ispartof Journal of Experimental Botany en
dc.title Canopy CO2 exchange of two neotropical tree species exhibiting constitutive and facultative CAM photosynthesis, <I>Clusia rosea</I> and <I>Clusia cylindrica</I> en
dc.type Journal Article en
dc.identifier.srbnumber 79002
dc.identifier.doi 10.1093/jxb/erp149
rft.jtitle Journal of Experimental Botany
rft.volume 60
rft.issue 11
rft.spage 3167
rft.epage 3177
dc.description.SIUnit encyclopedia of Life en
dc.description.SIUnit Forces of Change en
dc.description.SIUnit Clusia cylindrica, Clusia rosea, CO2 exchange, constitutive CAM, crassulacean acid metabolism, facultative CAM, photosynthetic pathway, tree canopy, whole-plant physiology en
dc.description.SIUnit STRI en
dc.citation.spage 3167
dc.citation.epage 3177


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