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|a Pectin Methylesterification Impacts the Relationship Between Photosynthesis and Plant Growth in Arabidopsis thaliana
|h [electronic resource]
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|a Oak Ridge, Tenn. :
|b Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
|c 2016.
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|a Size: p. 833-848 :
|b digital, PDF file.
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|a online resource
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|a Published through Scitech Connect.
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|a 04/04/2016.
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|a "Journal ID: ISSN 0032-0889"
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|a Weraduwage, Sarathi Maheshika; Kim, Sang-Jin; Renna, Luciana; Anozie, Fransisca Chidinma; Sharkey, Thomas D.; Brandizzi, Federica;
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|a Michigan State Univ., East Lansing, MI (United States). MSU-DOE Plant Research Laboratory.
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|a USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
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|a Photosynthesis occurs in mesophyll cells of specialized organs such as leaves. The rigid cell wall encapsulating photosynthetic cells controls the expansion and distribution of cells within photosynthetic tissues. The relationship between photosynthesis and plant growth is affected by leaf area. However, the underlying genetic mechanisms affecting carbon partitioning to different aspects of leaf growth are not known. To fill this gap, we analyzed Arabidopsis plants with altered levels of pectin methylesterification, which is known to modulate cell wall plasticity and plant growth. Pectin methylesterification levels were varied through manipulation of cotton Golgi-related (CGR) 2 or 3 genes encoding two functionally redundant pectin methyltransferases. Increased levels of methylesterification in a line over-expressing CGR2 (CGR2OX) resulted in highly expanded leaves with enhanced intercellular air spaces; reduced methylesterification in a mutant lacking both CGR-genes 2 and 3 (cgr2/3) resulted in thin but dense leaf mesophyll that limited CO<sub>2</sub> diffusion to chloroplasts. Leaf, root, and plant dry weight were enhanced in CGR2OX but decreased in cgr2/3. Differences in growth between wild type and the CGR-mutants can be explained by carbon partitioning but not by variations in area-based photosynthesis. Therefore, photosynthesis drives growth through alterations in carbon partitioning to new leaf area growth and leaf mass per unit leaf area; however, CGR-mediated pectin methylesterification acts as a primary factor in this relationship through modulation of the expansion and positioning of the cells in leaves, which in turn drive carbon partitioning by generating dynamic carbon demands in leaf area growth and leaf mass per unit leaf area.
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|a 59 basic biological sciences
|4 spn
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information
|4 dst.
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|u http://www.osti.gov/servlets/purl/1603301
|z Full Text (via OSTI)
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|a .b110168343
|b 11-30-21
|c 05-11-20
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|a University of Colorado Boulder
|b Online
|c Online
|d Online
|i web
|n 1
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