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

Plant, Cell and Environment - Tập 37 Số 4 - Trang 978-994 - 2014
Ying Sun1, Lianhong Gu2, Robert E. Dickinson1, Stephen G. Pallardy3, John M. Baker4, Yonghui Cao5, Fábio M. DaMatta6, Xuejun Dong7, David S. Ellsworth8, Davina Van Goethem9, Anna M. Jensen2, B. E. Law10, Rodolfo Araújo Loos11, Samuel C. V. Martins6, Richard J. Norby2, J. M. Warren2, David J. Weston12, Klaus Winter13
1Department of Geological Sciences University of Texas at Austin 1 University Station #C9000 Austin TX 78712 USA
2Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
3Department of Forestry University of Missouri Columbia MO 65211 USA
4USDA Soil & Water Management Unit & Department of Soil, Water & Climate University of Minnesota 1991 Upper Buford Circle St. Paul MN 55108 USA
5Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang, Zhejiang, China
6Departamento de Biologia Vegetal Universidade Federal de Viçosa 36570‐000 Viçosa MG Brazil
7Central Grasslands Research Extension Center, North Dakota State University, Streeter, ND 58483, USA
8Hawkesbury Institute for the Environment, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia
9Department of Bio‐science Engineering University of Antwerp Groenenborgerlaan 171 Antwerp 2020 Belgium
10College of Forestry, Oregon State University, Corvallis, OR 97331, USA
11Technology Center Fibria Celulose S.A Rod. Aracruz‐Barra do Riacho – km 25 Aracruz 29197900 Brazil
12Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
13Smithsonian Tropical Research Institute PO Box 0843‐03092 Balboa, Ancon Republic of Panama

Tóm tắt

AbstractWorldwide measurements of nearly 130C3species 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 fromA/Cicurves. We find that an assumption of infinitegmresults in up to 75% underestimation for maximum carboxylation rateVcmax, 60% for maximum electron transport rateJmax, and 40% for triose phosphate utilization rateTu.Vcmaxis most sensitive,Jmaxis less sensitive, andTuhas the least sensitivity to the variation ofgm. Because of this asymmetrical effect ofgm, the ratios ofJmaxtoVcmax,TutoVcmaxandTutoJmaxare all overestimated. An infinitegmassumption also limits the freedom of variation of estimated parameters and artificially constrains parameter relationships to stronger shapes. These findings suggest the importance of quantifyinggmfor understandingin situphotosynthetic machinery functioning. We show that a nonzero resistance toCO2movement in chloroplasts has small effects on estimated parameters. A non‐linear function withgmas input is developed to convert the parameters estimated under an assumption of infinitegmto proper values. This function will facilitategmrepresentation in global carbon cycle models.

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Plant, Cell and Environment

Tập 37 Số 4

978-994

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