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Abstract Detail



Anatomy and Morphology

Schulte, Paul [1], Randolph, Katie [2], Stanfield, RC [3], Hacke, Uwe [4].

Fluid flow through phloem sieve plates: a computational model showing the effects of sieve pore geometry.

The sieve plates in sieve tube members are thought to account for a significant resistance to flow in the phloem. Our studies considered the role of sieve cell structures on flow through the use of an approach from computational fluid dynamics. Models were constructed from SEM images of sieve cells and their sieve plates. Numerical solutions to the classical Navier-Stokes equations gave fluid pressures and velocities throughout the modeled cells. The overall placement of the sieve plate in terms of its angle with respect to the axis of the modeled cell allowed us to consider plate tilt effects. The observed sieve plate pores were often quite different from circular and so we considered the effect of sieve pore shape as well. Models showed overall that the sieve plates account for about 80 – 95% of the total sieve cell resistance. Our treatment of sieve plate pores with their observed shapes led to flow rates through those pores that were as much as 50% lower than treating them as circular with equivalent areas. Therefore sieve plate pore shape is an important feature in the resistance to flow through these dominant structures. Sieve plates with large tilt angles such as 70 degrees did not lead to a large reduction in flow resistance (less than 2%). However if the tilted plates were to take advantage of the greater plate area with more pores, a large effect on flow resistance would result.


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1 - University Of Nevada, School Of Life Sciences, Las Vegas, NV, 89154, United States
2 - 6361 Greyhawk Ave, Las Vegas, NV, 89108, United States
3 - University of Alberta, Edmonton, AB, Canada
4 - University Of Alberta, Department Of Renewable Resources, 442 Earth Sciences Building, Edmonton, AB, T6G 2E3, Canada

Keywords:
phloem
fluid dynamics
sieve plates
Navier-Stokes
hydraulic resistance.

Presentation Type: Poster
Session: P, Anatomy and Morphology
Location: Grand Ballroom - Exhibit Hall/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 5:30 PM This poster will be presented at 5:30 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PAM011
Abstract ID:506
Candidate for Awards:None


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