文献类型：期刊文献

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

作者：Sun, Ying[1] Gu, Lianhong[2] Dickinson, Robert E.[1] Pallardy, Stephen G.[3] Baker, John[4,5] Cao, Yonghui[6] DaMatta, Fabio Murilo[7] Dong, Xuejun[8] Ellsworth, David[9] Van Goethem, Davina[10] Jensen, Anna M.[2] Law, Beverly E.[11] Loos, Rodolfo[12] Vitor Martins, Samuel C.[7] Norby, Richard J.[2] Warren, Jeffrey[2] Weston, David[13] Winter, Klaus[14]

第一作者：Sun, Ying

通信作者：Gu, LH[1]

机构：[1]Univ Texas Austin, Dept Geol Sci, Austin, TX 78712 USA;[2]Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA;[3]Univ Missouri, Dept Forestry, Columbia, MO 65211 USA;[4]Univ Minnesota, USDA Soil & Water Management Unit, St Paul, MN 55108 USA;[5]Univ Minnesota, Dept Soil Water & Climate, St Paul, MN 55108 USA;[6]Chinese Acad Forestry, Res Inst Subtrop Forestry, Fuyang, Zhejiang, Peoples R China;[7]Univ Fed Vicosa, Dept Biol Vegetal, BR-36570000 Vicosa, MG, Brazil;[8]N Dakota State Univ, Cent Grasslands Res Extens Ctr, Streeter, ND 58483 USA;[9]Univ Western Sydney, Hawkesbury Inst Environm, Penrith, NSW 2751, Australia;[10]Univ Antwerp, Dept Biosci Engn, B-2020 Antwerp, Belgium;[11]Oregon State Univ, Coll Forestry, Corvallis, OR 97331 USA;[12]Fibria Celulose SA, Technol Ctr, BR-29197900 Aracruz, Brazil;[13]Oak Ridge Natl Lab, Biosci Div, Oak Ridge, TN 37831 USA;[14]Smithsonian Trop Res Inst, Balboa, Ancon, Panama

年份：2014

卷号：37

期号：4

起止页码：978-994

外文期刊名：PLANT CELL AND ENVIRONMENT

收录：;Scopus(收录号：2-s2.0-84896731935);WOS:【SCI-EXPANDED(收录号:WOS:000332085000014)】；

基金：We thank Dr. Tom Sharkey and two anonymous reviewers for providing insightful suggestions that led to substantial improvements of the paper. This study was carried out at multiple institutions. The support for research at UT - Austin came from the Department of Energy (DE-FG02-01ER63198). The support for research at ORNL came from the U.S. Department of Energy, Office of Science, Biological and Environmental Research Program, Climate and Environmental Sciences Division. The ORNL's LDRD programme also partially supported the research. ORNL is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725. U.S. Department of Energy support for the University of Missouri (Grant DE-FG02-03ER63683) is gratefully acknowledged.

语种：英文

外文关键词：parameter estimation; carbon cycle model; leaf photosynthesis; A/Ci curves; LeafWeb

摘要：Worldwide measurements of nearly 130 C-3 species covering all major plant functional types are analysed in conjunction with model simulations to determine the effects of mesophyll conductance (g(m)) on photosynthetic parameters and their relationships estimated from A/C-i curves. We find that an assumption of infinite g(m) results in up to 75% underestimation for maximum carboxylation rate V-cmax, 60% for maximum electron transport rate J(max), and 40% for triose phosphate utilization rate T-u. V-cmax is most sensitive, J(max) is less sensitive, and T-u has the least sensitivity to the variation of g(m). Because of this asymmetrical effect of g(m), the ratios of J(max) to V-cmax, T-u to V-cmax and T-u to J(max) are all overestimated. An infinite g(m) 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 g(m) 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 g(m) as input is developed to convert the parameters estimated under an assumption of infinite g(m) to proper values. This function will facilitate g(m) representation in global carbon cycle models.