Changes in photosynthesis during leaf expansion in Corymbia gummifera

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Show simple item record Choinski Jr, JS Ralph, P Eamus, D 2009-12-21T02:30:00Z 2003
dc.identifier.citation Australian Journal of Botany, 2003, 51 (1), pp. 111 - 118
dc.identifier.issn 0067-1924
dc.identifier.other C1 en_US
dc.description.abstract Growth, pigment levels and various photosynthesis parameters were measured in expanding leaves of Corymbia gummifera (Solander ex Gaertner) Hochreutiner. C. gummifera trees were studied growing in sandstone plateau woodland communities in Royal National Park, New South Wales, in a recently burned open habitat. Young leaves (horizontally oriented to maximise light exposure) were found to be conspicuously red until they reached approximately 75% of their full size. As the leaves expanded, anthocyanin content declined and chlorophyll levels proportionately increased. Young red leaves showed net negative carbon assimilation rates, although CO2 assimilation rate, transpiration rate, stomatal conductance, actual quantum yield of PSII (ΦPSII) and apparent electron transport rate (ETR) all increased in a similar pattern as the leaves expanded. Measurements of maximum quantum yield of dark-adapted leaves (Fv/Fm) were also correlated with leaf area. Younger leaves had lower Fv/Fm ratios than did mature leaves, whether measured at midday or 2 h after sunset, indicating that young leaves exhibited some degree of chronic photoinhibition. It is concluded that C. gummifera exhibits a transient red pattern of anthocyanin expression and that photosynthesis is limited in young leaves because of low stomatal conductance, low chlorophyll content, immature chloroplasts and an attenuation of light caused by anthocyanins.
dc.language eng
dc.relation.isbasedon 10.1071/BT02008
dc.title Changes in photosynthesis during leaf expansion in Corymbia gummifera
dc.type Journal Article
dc.parent Australian Journal of Botany
dc.journal.volume 1
dc.journal.volume 51
dc.journal.number 1 en_US
dc.publocation Collingwood, Australia en_US
dc.publocation Australia
dc.identifier.startpage 111 en_US
dc.identifier.endpage 118 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.conference Vine and Vineyard Water Requirements
dc.for 060705 Plant Physiology
dc.personcode 000006
dc.personcode 890085
dc.percentage 100 en_US Plant Physiology en_US
dc.classification.type FOR-08 en_US 2002-12-31
dc.location.activity Adelaide University, Australia
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Faculty of Science/School of the Environment
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true

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