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Asymmetrical effects of mesophyll conductance on fundamental photosynthetic parameters and their relationships estimated from leaf gas exchange measurements

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dc.contributor.author Sun, Ying en
dc.contributor.author Gu, Lianhong en
dc.contributor.author Dickinson, Robert E. en
dc.contributor.author Pallardy, Stephen G. en
dc.contributor.author Baker, John en
dc.contributor.author Cao, Yonghui en
dc.contributor.author Damatta, Fá en
dc.contributor.author Dong, Xuejun en
dc.contributor.author Ellsworth, David en
dc.contributor.author Van Goethem, Davina en
dc.contributor.author Jensen, Anna M. en
dc.contributor.author Law, Beverly E. en
dc.contributor.author Loos, Rodolfo en
dc.contributor.author Martins, Samuel C. Vitor en
dc.contributor.author Norby, Richard J. en
dc.contributor.author Warren, Jeffrey en
dc.contributor.author Weston, David en
dc.contributor.author Winter, Klaus en
dc.date.accessioned 2015-02-25T18:30:13Z
dc.date.available 2015-02-25T18:30:13Z
dc.date.issued 2014
dc.identifier.citation Sun, Ying, Gu, Lianhong, Dickinson, Robert E., Pallardy, Stephen G., Baker, John, Cao, Yonghui, Damatta, Fá, Dong, Xuejun, Ellsworth, David, Van Goethem, Davina, Jensen, Anna M., Law, Beverly E., Loos, Rodolfo, Martins, Samuel C. Vitor, Norby, Richard J., Warren, Jeffrey, Weston, David, and Winter, Klaus. 2014. "<a href="https://stri-apps.si.edu/docs/publications/pdfs/pce12213.pdf">Asymmetrical effects of mesophyll conductance on fundamental photosynthetic parameters and their relationships estimated from leaf gas exchange measurements</a>." <em>Plant, Cell and Environment</em>. 37 (4):978&ndash;994. <a href="https://doi.org/10.1111/pce.12213">https://doi.org/10.1111/pce.12213</a> en
dc.identifier.issn 0140-7791
dc.identifier.uri http://hdl.handle.net/10088/24452
dc.description.abstract Worldwide measurements of nearly 130 C3 species covering all major plant functional types are analysed in conjunction with model simulations to determine the effects of mesophyll conductance (gm) on photosynthetic parameters and their relationships estimated from A/Ci curves. We find that an assumption of infinite gm results in up to 75% underestimation for maximum carboxylation rate Vcmax, 60% for maximum electron transport rate Jmax, and 40% for triose phosphate utilization rate Tu. Vcmax is most sensitive, Jmax is less sensitive, and Tu has the least sensitivity to the variation of gm. Because of this asymmetrical effect of gm, the ratios of Jmax to Vcmax, Tu to Vcmax and Tu to Jmax are all overestimated. An infinite gm assumption also limits the freedom of variation of estimated parameters and artificially constrains parameter relationships to stronger shapes. These findings suggest the importance of quantifying gm for understanding in situ photosynthetic machinery functioning. We show that a nonzero resistance to CO2 movement in chloroplasts has small effects on estimated parameters. A non-linear function with gm as input is developed to convert the parameters estimated under an assumption of infinite gm to proper values. This function will facilitate gm representation in global carbon cycle models. en
dc.relation.ispartof Plant, Cell and Environment en
dc.title Asymmetrical effects of mesophyll conductance on fundamental photosynthetic parameters and their relationships estimated from leaf gas exchange measurements en
dc.type Journal Article en
dc.identifier.srbnumber 117706
dc.identifier.doi 10.1111/pce.12213
rft.jtitle Plant, Cell and Environment
rft.volume 37
rft.issue 4
rft.spage 978
rft.epage 994
dc.description.SIUnit STRI en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 978
dc.citation.epage 994
dc.relation.url https://stri-apps.si.edu/docs/publications/pdfs/pce12213.pdf


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