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C4 photosynthesis in a single cell is theoretically inefficient but may ameliorate internal CO2 diffusion limitations of C3 leaves

von Caemmerer, Susanne

Description

Attempts are being made to introduce C4 photosynthetic characteristics into C3 crop plants by genetic manipulation. This research has focused on engineering single-celled C4-type CO 2 concentrating mechanisms into C3 plants such as rice. Herein the pros and cons of such approaches are discussed with a focus on CO2 diffusion, utilizing a mathematical model of single-cell C 4 photosynthesis. It is shown that a high bundle sheath resistance to CO2 diffusion is an essential feature of...[Show more]

dc.contributor.authorvon Caemmerer, Susanne
dc.date.accessioned2015-12-13T22:27:43Z
dc.date.available2015-12-13T22:27:43Z
dc.identifier.issn0140-7791
dc.identifier.urihttp://hdl.handle.net/1885/74063
dc.description.abstractAttempts are being made to introduce C4 photosynthetic characteristics into C3 crop plants by genetic manipulation. This research has focused on engineering single-celled C4-type CO 2 concentrating mechanisms into C3 plants such as rice. Herein the pros and cons of such approaches are discussed with a focus on CO2 diffusion, utilizing a mathematical model of single-cell C 4 photosynthesis. It is shown that a high bundle sheath resistance to CO2 diffusion is an essential feature of energy-efficient C 4 photosynthesis. The large chloroplast surface area appressed to the intercellular airspace in C3 leaves generates low internal resistance to CO2 diffusion, thereby limiting the energy efficiency of a single-cell C4 concentrating mechanism, which relies on concentrating CO2 within chloroplasts of C3 leaves. Nevertheless the model demonstrates that the drop in CO2 partial pressure, pCO2, that exists between intercellular airspace and chloroplasts in C3 leaves at high photosynthetic rates, can be reversed under high irradiance when energy is not limiting. The model shows that this is particularly effective at lower intercellular pCO2. Such a system may therefore be of benefit in water-limited conditions when stomata are closed and low intercellular pCO2 increases photorespiration.
dc.publisherBlackwell Publishing Ltd
dc.sourcePlant Cell and Environment
dc.subjectKeywords: photosynthesis C3 plants; C4 plants; CO2 diffusion
dc.titleC4 photosynthesis in a single cell is theoretically inefficient but may ameliorate internal CO2 diffusion limitations of C3 leaves
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume26
dc.date.issued2003
local.identifier.absfor060705 - Plant Physiology
local.identifier.ariespublicationMigratedxPub3949
local.type.statusPublished Version
local.contributor.affiliationvon Caemmerer, Susanne, College of Medicine, Biology and Environment, ANU
local.bibliographicCitation.startpage1191
local.bibliographicCitation.lastpage1197
local.identifier.doi10.1046/j.0016-8025.2003.01061.x
dc.date.updated2015-12-11T08:34:02Z
local.identifier.scopusID2-s2.0-0042232318
CollectionsANU Research Publications

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