• Home
  • Patrick C Friesen
Patrick C Friesen

Patrick C Friesen
BioChambers · Research and Development

PhD

About

29
Publications
5,160
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
297
Citations
Introduction
Currently at BioChambers I am primarily researching how light quality and quantity affects plant growth and development using LEDs. I am also researching how the vapour pressure deficit, wind speed, and CO2 concentration can also affect plant growth and development. In addition, I am also writing a paper on the 3rd and 4th year biomass yields of perennial warm season (C4) grasses in Manitoba, part of my post-doc and an extension of my PhD research.
Additional affiliations
April 2016 - April 2017
University of Manitoba
Position
  • PostDoc Position
Description
  • Started multi-year field trials of warm season (C4) perennial grasses in southern Manitoba. Conducted an experiment looking at the effects of nitrogen on first year growth and photosynthesis of Switchgrass and Big Bluestem (Friesen and Cattani, 2017).
May 2015 - present
BioChambers
Position
  • Sales Professional
Description
  • At BioChambers I am primarily researching how light quality and quantity affects plant growth and development using LEDs. I am also researching how other environmental factors also affect plant growth and development.
June 2008 - October 2008
Smithsonian Tropical Research Institute
Position
  • BSc Honours Student
Education
September 2009 - June 2015
University of Toronto
Field of study
  • Applied Plant Physiological Ecology
September 2003 - June 2009
The University of Winnipeg
Field of study
  • Biology

Publications

Publications (29)
Article
Full-text available
This article is about BioChamber's LED lighting options and describes how to retrofit existing chambers with fluorescent/halogen lighting to LEDs.
Article
Warm season perennial grasses that use C4 photosynthesis can provide a reliable supply of bioenergy and biomaterials, achieving the greatest annually harvestable biomass of any crop in most temperate regions. Short growing seasons bookended by cold temperatures and snow cover challenge the productivity of C4 perennial grasses at high latitudes. Cul...
Article
Full-text available
This article briefly explains how humidity may affect plant growth and the factors to consider in deciding whether or not to include humidity control in new growth chambers.
Article
Full-text available
This article is about how CO2 concentration affects plant growth and the factors to consider when deciding whether or not to include CO2 control in new growth chambers.
Article
Full-text available
This article is about how light intensity affects plant growth and how to measure light intensity inside growth chambers.
Article
Full-text available
This article is about how photoperiod and the daily light integral (DLI) affect plant growth and development.
Article
Full-text available
This article briefly describes how far-red affects plant growth and development to help decide whether or not to include far-red in your growth light spectrum.
Article
Full-text available
This article reviews how light quality affects plant growth and development, from UV-B to far-red (280 to 780nm).
Article
Full-text available
This article explains how temperature affects plant growth and development and outlines the factors to consider when selecting growth temperatures in growth chambers.
Article
Full-text available
This article reviews how pot size, color, and insulation may affect plant growth and development.
Article
Full-text available
This article reviews how air movement affects plant growth and development.
Article
Full-text available
This article reviews how to design experiments with growth chambers and rooms.
Article
Full-text available
This report first reviews how humidity and the vapor pressure deficit affect plant growth and health. Next, it outlines how to estimate transpiration and water vapor loads from plants, how to adjust humidity inside equipment without formal humidity control, formal humidity control options, and how to interpret humidity specifications.
Article
Full-text available
This document explains how far-red affects plant growth and development and how to control the amount and proportion of far-red inside a growth chamber or room.
Article
Despite an abundance of research on the biomass response to nitrogen fertilizer in established switchgrass fields, there is a dearth of knowledge of the first year response in switchgrass, and nothing yet available for big bluestem. Based on differences in their C4 photosynthetic subtypes, big bluestem may show greater photosynthetic (PNUE) and abo...
Article
Full-text available
This document explains the importance of fresh air flow through your plant growth chamber or room. In growth chambers or rooms that are filled with large plants, the plants themselves can bring down the CO2 concentration if the fresh air flow rate is inadequate. Reduced CO2 concentrations can slow the growth rate of most plants to varying degrees.
Article
Miscanthus is a C4 perennial grass being developed for bioenergy production in temperate regions where chilling events are common. To evaluate chilling effects on Miscanthus, we assessed the processes controlling net CO2 assimilation rate (A) in M. x giganteus (M161) and a chilling-sensitive Miscanthus hybrid (M115) before and after a chilling trea...
Article
Full-text available
There is much interest in cultivating C4 perennial plants in northern climates where there is an abundance of land and a potential large market for biofuels. C4 feedstocks can exhibit superior yields to C3 alternatives during the long warm days of summer at high latitude, but their summer success depends on an ability to tolerate deep winter cold,...
Article
Full-text available
Miscanthus × giganteus grown in cool temperate regions of North America and Europe can exhibit severe mortality in the year after planting, and poor frost tolerance of leaves. Spartina pectinata (prairie cordgrass), a productive C4 perennial grass native to North America, has been suggested as an alternative biofuel feedstock for colder regions; ho...
Article
Full-text available
The cold tolerance of winter-dormant rhizomes was evaluated in diploid, allotriploid, and allotetraploid hybrids of Miscanthus sinensis and Miscanthus sacchariflorus grown in a field setting. Two artificial freezing protocols were tested: one lowered the temperature continuously by 1°C h(-1) to the treatment temperature and another lowered the temp...
Article
Full-text available
Miscanthus hybrids are leading candidates for bioenergy feedstocks in mid to high latitudes of North America and Eurasia, due to high productivity associated with the C4 photosynthetic pathway and their tolerance of cooler conditions. However, as C4 plants, they may lack tolerance of chilling conditions (0–10 °C) and frost, particularly when compar...
Article
Full-text available
The evolution of C4 photosynthesis in many taxa involves the establishment of a two-celled, photorespiratory CO2 pump termed C2 photosynthesis. How C3 species evolved C2 metabolism is critical to understanding the initial phases of C4 plant evolution. To evaluate early events in C4 evolution, we compared leaf anatomy, ultrastructure and gas exchang...
Poster
Full-text available
Objective Studies of C4 photosynthesis evolution have led to conceptual models proposing a stepwise origin of the C4 pathway (Monson and Rawsthorne 2000; Sage et al., 2012). These models are based on physiological and phylogenetic research with genera that include C3, C4, and C3-C4 intermediate species. Comparisons between groups support the hypoth...
Article
Native hardwood trees are frequently planted to restore forest cover to abandoned agricultural lands in the Neotropics. Few studies compare rainfall interception in such plantations and the vegetation the trees are planted to replace. We compared throughfall (TF) and stemflow (SF) in a mature stand of wild sugar cane Saccharum spontaneum L. and six...
Article
The hydrological properties of leaf litter layers remain relatively unexplored, especially in tropical vegetation communities. In this paper we explore the hydrological dynamics of litter samples from reforestation plots of tropical hardwoods and the invasive sugar cane Saccharum spontaneum, which these trees were planted to replace. Water holding...

Network

Cited By

Projects

Projects (3)
Project
To educate people how light quantity and quality, CO2 concentration, vapour pressure deficit, temperature, pot size, growing media, and nutrition affect plant growth. The aim is to help people control the environment inside growth chambers to A) compare results to past literature or B) to tailor plant growth towards an end goal (eg. maximize vegetative biomass or control flowering for seed production).