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Fixation, Partitioning and Export of Carbon in two Species of the Plantaginaceae

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dc.contributor.advisor Grodzinski, Bernard Szucs, Ildiko 2013-04-05T13:22:35Z 2013-04-05T13:22:35Z 2013-02 2013-02-19 2013-04-05
dc.description.abstract During photosynthesis Plantaginaceae species can produce glucose derivatives such as iridoid glycosides and alcohol sugars that in addition to sucrose can be exported from leaves. Plantago lanceolata transported sorbitol in addition to sucrose especially at warmer leaf temperatures. However, two iridoids, catalpol and aucubin, found in P. lanceolata were not readily labelled from 14CO2 under any conditions examined. In contrast, in two greenhouse, cut-flower cultivars of Antirrhinum majus the iridoids, antirrhinoside and antirrhide, were readily 14C-labelled along with sucrose but little 14C was recovered in alcohol sugars (e.g., mannitol). The amount of 14C-partitioned into antirrhinoside increased at higher temperatures. Exposing leaves of P. lanceolata and A. majus to reduced-photorespiratory conditions (e.g. short-term CO2 enrichment and/or low O2) increased fixation and export. Under low O2 in P. lanceolata sorbitol 14C-labelling increased relative to sucrose and in A. majus 14C-labelling of sucrose increased relative to antirrhinoside. Also 14C-labelling of antirrhide increased more than antirrhinoside. During both short-term and long-term acclimation to high CO2, whole plant NCER, leaf photosynthesis and export increased in A. majus. Taken together the temperature and CO2 enrichment studies show plasticity in Plantaginaceae species to synthesize and transport sucrose and auxiliary glucose esters and alcohol sugars in a species-specific manner (depending on the rate of carboxylation). en_US
dc.language.iso en en_US
dc.subject Iridoid en_US
dc.subject glycoside en_US
dc.subject terpenoid en_US
dc.subject terpene en_US
dc.subject monoterpene en_US
dc.subject Antirrhinum majus en_US
dc.subject Plantago lanceolata en_US
dc.subject Plantaginaceae en_US
dc.subject whole plant en_US
dc.subject photosynthesis en_US
dc.subject reduced photorespiratory en_US
dc.subject low O2 en_US
dc.subject elevated CO2 en_US
dc.subject CO2 en_US
dc.subject 14CO2 en_US
dc.subject 14C-labelling en_US
dc.subject 14C-partitioning en_US
dc.subject temperature en_US
dc.subject alcohol sugar en_US
dc.subject sorbitol en_US
dc.subject mannitol en_US
dc.subject snapdragon en_US
dc.subject aucubin en_US
dc.subject catalpol en_US
dc.subject antirrhide en_US
dc.subject antirrhinoside en_US
dc.subject leaf en_US
dc.subject long term en_US
dc.subject short term en_US
dc.subject export en_US
dc.subject phloem en_US
dc.subject partitioning en_US
dc.subject glucose derivative en_US
dc.subject gas exchange en_US
dc.title Fixation, Partitioning and Export of Carbon in two Species of the Plantaginaceae en_US
dc.type Thesis en_US Plant Agriculture en_US Doctor of Philosophy en_US Department of Plant Agriculture en_US
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