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Introducing turgor-driven growth dynamics into functional-structural plant models

(2018) ANNALS OF BOTANY. 121(5). p.849-861
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Abstract
Background and Aims: In many scenarios the availability of assimilated carbon is not the constraining factor of plant growth. Rather, organ growth appears driven by sink activity in which water availability plays a determinant role. Current functional-structural plant models (FSPMs) mainly focus on plant-carbon relations and largely disregard the importance of plant water status in organogenesis. Consequently, incorporating a turgor-driven growth concept, coupling carbon and water dynamics in an FSPM, presents a significant improvement towards capturing plant development in a more mechanistic manner. Methods: An existing process-based water flow and storage model served as a basis for implementing water control in FSPMs. Its concepts were adjusted to the scale of individual plant organs and interwoven with the basic principles of modelling carbon dynamics to allow evaluation of turgor pressure across the entire plant. This was then linked to plant organ growth by applying the principles of the widely used Lockhart equation. Key results: This model successfully integrates a mechanistic understanding of plant water transport dynamics coupled with simple carbon dynamics within a dynamically developing plant architecture. It allows evaluation of turgor pressure on the scale of plant organs, resulting in clear diel and long-term patterns, directly linked to plant organ growth. Conclusions: A conceptual sap flow and turgor-driven growth model was introduced for functional-structural plant modelling. It is applicable to any plant architecture and allows visual exploration of the diel patterns of organ water content and growth. Integrated in existing FSPMs, this new concept fosters an array of possibilities for FSPMs, as it presents a different formulation of growth in terms of local processes, influenced by local and external conditions.
Keywords
FSPM, plant hydraulics, sink-driven growth, mechanistic modelling, GroIMP, turgor, plant growth, STEM DIAMETER VARIATIONS, SAP-FLOW, FRUIT-GROWTH, WATER-STRESS, L-PEACH, TREE, DROUGHT, CARBON, XYLEM, PHOTOSYNTHESIS

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Chicago
Coussement, Jonas, Tom De Swaef, Peter Lootens, Isabel Roldàn-Ruiz, and Kathy Steppe. 2018. “Introducing Turgor-driven Growth Dynamics into Functional-structural Plant Models.” Annals of Botany 121 (5): 849–861.
APA
Coussement, Jonas, De Swaef, T., Lootens, P., Roldàn-Ruiz, I., & Steppe, K. (2018). Introducing turgor-driven growth dynamics into functional-structural plant models. ANNALS OF BOTANY, 121(5), 849–861.
Vancouver
1.
Coussement J, De Swaef T, Lootens P, Roldàn-Ruiz I, Steppe K. Introducing turgor-driven growth dynamics into functional-structural plant models. ANNALS OF BOTANY. 2018;121(5):849–61.
MLA
Coussement, Jonas, Tom De Swaef, Peter Lootens, et al. “Introducing Turgor-driven Growth Dynamics into Functional-structural Plant Models.” ANNALS OF BOTANY 121.5 (2018): 849–861. Print.
@article{8564011,
  abstract     = {Background and Aims: In many scenarios the availability of assimilated carbon is not the constraining factor of plant growth. Rather, organ growth appears driven by sink activity in which water availability plays a determinant role. Current functional-structural plant models (FSPMs) mainly focus on plant-carbon relations and largely disregard the importance of plant water status in organogenesis. Consequently, incorporating a turgor-driven growth concept, coupling carbon and water dynamics in an FSPM, presents a significant improvement towards capturing plant development in a more mechanistic manner. 
Methods: An existing process-based water flow and storage model served as a basis for implementing water control in FSPMs. Its concepts were adjusted to the scale of individual plant organs and interwoven with the basic principles of modelling carbon dynamics to allow evaluation of turgor pressure across the entire plant. This was then linked to plant organ growth by applying the principles of the widely used Lockhart equation. 
Key results: This model successfully integrates a mechanistic understanding of plant water transport dynamics coupled with simple carbon dynamics within a dynamically developing plant architecture. It allows evaluation of turgor pressure on the scale of plant organs, resulting in clear diel and long-term patterns, directly linked to plant organ growth. 
Conclusions: A conceptual sap flow and turgor-driven growth model was introduced for functional-structural plant modelling. It is applicable to any plant architecture and allows visual exploration of the diel patterns of organ water content and growth. Integrated in existing FSPMs, this new concept fosters an array of possibilities for FSPMs, as it presents a different formulation of growth in terms of local processes, influenced by local and external conditions.},
  author       = {Coussement, Jonas and De Swaef, Tom and Lootens, Peter and Rold{\`a}n-Ruiz, Isabel and Steppe, Kathy},
  issn         = {0305-7364},
  journal      = {ANNALS OF BOTANY},
  language     = {eng},
  number       = {5},
  pages        = {849--861},
  title        = {Introducing turgor-driven growth dynamics into functional-structural plant models},
  url          = {http://dx.doi.org/10.1093/aob/mcx144},
  volume       = {121},
  year         = {2018},
}

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