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Title: Optimization of leaf morphology in relation to leaf water status: A theory

Abstract

The leaf economic traits such as leaf area, maximum carbon assimilation rate, and venation are all correlated and related to water availability. Furthermore, leaves are often broad and large in humid areas and narrower in arid/semiarid and hot and cold areas. We use optimization theory to explain these patterns. We have created a constrained optimization leaf model linking leaf shape to vein structure that is integrated into coupled transpiration and carbon assimilation processes. The model maximizes net leaf carbon gain (NPPleaf) over the loss of xylem water potential. Modeled relations between leaf traits are consistent with empirically observed patterns. As the results of the leaf shape-venation relation, our model further predicts that a broadleaf has overall higher NPPleaf compared to a narrowleaf. In addition, a broadleaf has a lower stomatal resistance compared to a narrowleaf under the same level of constraint. With the same leaf area, a broadleaf will have, on average, larger conduits and lower total leaf xylem resistance and thus be more efficient in water transportation but less resistant to cavitation. By linking venation structure to leaf shape and using water potential as the constraint, our model provides a physical explanation for the general pattern of the covariancemore » of leaf traits through the safety-efficiency trade-off of leaf hydraulic design.« less

Authors:
ORCiD logo [1];  [2];  [2]
  1. Univ. of Calgary, AB (Canada); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of Calgary, AB (Canada)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Natural Sciences and Engineering Research Council of Canada (NSERC)
OSTI Identifier:
1603617
Grant/Contract Number:  
[AC02-05CH11231]
Resource Type:
Accepted Manuscript
Journal Name:
Ecology and Evolution
Additional Journal Information:
[ Journal Volume: 10; Journal Issue: 3]; Journal ID: ISSN 2045-7758
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; hydraulic traits; leaf carbon budget; leaf shape; safety-efficiency trade-off; stomatal optimization; vascular system; vein structure; xylem resistance

Citation Formats

Ding, Junyan, Johnson, Edward A., and Martin, Yvonne E. Optimization of leaf morphology in relation to leaf water status: A theory. United States: N. p., 2020. Web. doi:10.1002/ece3.6004.
Ding, Junyan, Johnson, Edward A., & Martin, Yvonne E. Optimization of leaf morphology in relation to leaf water status: A theory. United States. doi:10.1002/ece3.6004.
Ding, Junyan, Johnson, Edward A., and Martin, Yvonne E. Wed . "Optimization of leaf morphology in relation to leaf water status: A theory". United States. doi:10.1002/ece3.6004. https://www.osti.gov/servlets/purl/1603617.
@article{osti_1603617,
title = {Optimization of leaf morphology in relation to leaf water status: A theory},
author = {Ding, Junyan and Johnson, Edward A. and Martin, Yvonne E.},
abstractNote = {The leaf economic traits such as leaf area, maximum carbon assimilation rate, and venation are all correlated and related to water availability. Furthermore, leaves are often broad and large in humid areas and narrower in arid/semiarid and hot and cold areas. We use optimization theory to explain these patterns. We have created a constrained optimization leaf model linking leaf shape to vein structure that is integrated into coupled transpiration and carbon assimilation processes. The model maximizes net leaf carbon gain (NPPleaf) over the loss of xylem water potential. Modeled relations between leaf traits are consistent with empirically observed patterns. As the results of the leaf shape-venation relation, our model further predicts that a broadleaf has overall higher NPPleaf compared to a narrowleaf. In addition, a broadleaf has a lower stomatal resistance compared to a narrowleaf under the same level of constraint. With the same leaf area, a broadleaf will have, on average, larger conduits and lower total leaf xylem resistance and thus be more efficient in water transportation but less resistant to cavitation. By linking venation structure to leaf shape and using water potential as the constraint, our model provides a physical explanation for the general pattern of the covariance of leaf traits through the safety-efficiency trade-off of leaf hydraulic design.},
doi = {10.1002/ece3.6004},
journal = {Ecology and Evolution},
number = [3],
volume = [10],
place = {United States},
year = {2020},
month = {1}
}

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