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Influence of leaf dry mass per area, CO2, and irradiance on mesophyll conductance in sclerophylls

Hassiotou, Foteini; Ludwig, Martha; Renton, Michael; Veneklaas, Erik J; Evans, John

Description

Leaf photosynthesis (A) is limited by mesophyll conductance (gm), which is influenced by both leaf structure and the environment. Previous studies have indicated that the upper bound for gm declines as leaf dry mass per area (LMA, an indicator of leaf structure) increases, extrapolating to zero at a LMA of about 240 g m-2. No data exist on gm and its response to the environment for species with LMA values higher than 220 g m-2. In this study, laboratory measurements of leaf gas exchange and in...[Show more]

dc.contributor.authorHassiotou, Foteini
dc.contributor.authorLudwig, Martha
dc.contributor.authorRenton, Michael
dc.contributor.authorVeneklaas, Erik J
dc.contributor.authorEvans, John
dc.date.accessioned2015-12-10T23:02:52Z
dc.identifier.issn0022-0957
dc.identifier.urihttp://hdl.handle.net/1885/61941
dc.description.abstractLeaf photosynthesis (A) is limited by mesophyll conductance (gm), which is influenced by both leaf structure and the environment. Previous studies have indicated that the upper bound for gm declines as leaf dry mass per area (LMA, an indicator of leaf structure) increases, extrapolating to zero at a LMA of about 240 g m-2. No data exist on gm and its response to the environment for species with LMA values higher than 220 g m-2. In this study, laboratory measurements of leaf gas exchange and in vivo chlorophyll a fluorescence were used concurrently to derive estimates of gm in seven species of the Australian sclerophyllous genus Banksia covering a wide range of LMA (130-480 g m-2). Irradiance and CO2 were varied during those measurements to gauge the extent of environmental effects on gm. A significant decrease of gm with increasing LMA was found. gm declined by 35-60% in response to increasing atmospheric CO2 concentrations at high irradiance, with a more variable response (0-60%) observed at low irradiance, where gm was, on average, 22% lower than at high irradiance at ambient CO2 concentrations. Despite considerable variation in A and LMA between the Banksia species, the CO2 concentrations in the intercellular air spaces (Ci, 262±5 μmol mol-1) and in the chloroplasts (Cc, 127±4 μmol mol -1) were remarkably stable.
dc.publisherOxford University Press
dc.sourceJournal of Experimental Botany
dc.subjectKeywords: carbon dioxide; chlorophyll; chlorophyll a; article; chemistry; diffusion; light; metabolism; plant leaf; Proteaceae; radiation exposure; Carbon Dioxide; Chlorophyll; Diffusion; Light; Plant Leaves; Proteaceae; Banksia Banksia; CO2; Leaf anatomy; Leaf internal conductance; Light intensity; Photosynthesis; Sclerophylly
dc.titleInfluence of leaf dry mass per area, CO2, and irradiance on mesophyll conductance in sclerophylls
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume60
dc.date.issued2009
local.identifier.absfor060705 - Plant Physiology
local.identifier.ariespublicationu9204316xPUB652
local.type.statusPublished Version
local.contributor.affiliationHassiotou, Foteini, University of Western Australia
local.contributor.affiliationLudwig, Martha, University of Western Australia
local.contributor.affiliationRenton, Michael, University of Western Australia
local.contributor.affiliationVeneklaas, Erik J, University of Western Australia
local.contributor.affiliationEvans, John, College of Medicine, Biology and Environment, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue8
local.bibliographicCitation.startpage2303
local.bibliographicCitation.lastpage2314
local.identifier.doi10.1093/jxb/erp021
dc.date.updated2016-02-24T11:53:02Z
local.identifier.scopusID2-s2.0-65249084701
local.identifier.thomsonID000266348800008
CollectionsANU Research Publications

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