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Drought-stress-induced up-regulation of CAM in seedlings of a tropical cactus, <I>Opuntia elatior</I>, operating predominantly in the C<SUB>3</SUB> mode

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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 2013-09-06T19:16:35Z
dc.date.available 2013-09-06T19:16:35Z
dc.date.issued 2011
dc.identifier.citation Winter, Klaus, Garcia, Milton N., and Holtum, Joseph A. M. 2011. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F21172">Drought-stress-induced up-regulation of CAM in seedlings of a tropical cactus, Opuntia elatior, operating predominantly in the C3 mode</a>." <em>Journal of experimental botany</em>. 62 (11):4037&ndash;4042. <a href="https://doi.org/10.1093/jxb/err106">https://doi.org/10.1093/jxb/err106</a> en
dc.identifier.issn 0022-0957
dc.identifier.uri http://hdl.handle.net/10088/21172
dc.description.abstract Immediately after unfolding, cotyledons of the tropical platyopuntoid cactus, Opuntia elatior Mill., exhibited a C3-type diel CO2 exchange pattern characterized by net CO2 uptake in the light. Significant nocturnal increases in titratable acidity typical of crassulacean acid metabolism (CAM) were not detected at this early developmental stage. As cotyledons matured and the first cladode (flattened stem) developed, features of CAM were observed and the magnitude of CAM increased. Nonetheless, in well-watered seedlings up to 10 cm tall, C3 photosynthetic CO2 fixation in the light remained the major pathway of carbon fixation. Reduced soil water availability led to an up-regulation of net dark CO2 fixation and greater nocturnal increases in tissue acidity, consistent with facultative CAM. These observations demonstrate that C3 photosynthesis, drought-stress-related facultative CAM, and developmentally controlled constitutive CAM can all contribute to the early growth of O. elatior. The strong C3 component and facultative CAM features expressed in young O. elatior contrast with mature plants in which obligate CAM is the major pathway of carbon acquisition. en
dc.relation.ispartof Journal of experimental botany en
dc.title Drought-stress-induced up-regulation of CAM in seedlings of a tropical cactus, <I>Opuntia elatior</I>, operating predominantly in the C<SUB>3</SUB> mode en
dc.type Journal Article en
dc.identifier.srbnumber 101382
dc.identifier.doi 10.1093/jxb/err106
rft.jtitle Journal of experimental botany
rft.volume 62
rft.issue 11
rft.spage 4037
rft.epage 4042
dc.description.SIUnit STRI en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 4037
dc.citation.epage 4042


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