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Papers by Juliette Jordan

Research paper thumbnail of Determination of carbon nanotubes effects on plant phenotype, plant physiology and bollworm development

Research paper thumbnail of Quantifying Environmental Maternal Effects in the Invasive Plant, Silene Latifolia

One of the over-arching goals of biology is to determine the relative importance of nature versus... more One of the over-arching goals of biology is to determine the relative importance of nature versus nurture. Nature versus nurture reflects the relative contribution of an individual’s genetic makeup and environment to its growth and reproduction. In addition, the environment experienced by an individual’s mother can also indirectly affect the performance of her offspring – these are environmental maternal effects (EME). For example, if a mother experiences a high quality environment, her offspring may respond with enhanced growth. We expect natural variation in habitat quality to lead to high levels of EME since mothers will vary in the environment they experience. The goal of my thesis was to quantify EME using a plant species, Silene latifolia, which is native to Europe and invasive in North America. I did this by experimentally comparing the amount of variation in life history traits between two generations: Natural (Parent) and Uniform (Offspring). The Parent generation was obtai...

Research paper thumbnail of Carbon nanotubes affect early growth, flowering time and phytohormones in tomato

Chemosphere, 2020

Carbon nanotube (CNT) applications are increasing in consumer products, including agriculture dev... more Carbon nanotube (CNT) applications are increasing in consumer products, including agriculture devices, making them an important contaminant to study in the field of plant nanotoxicology. Several studies have observed the uptake and effects of CNTs in plants. However, in other studies differing results were observed on growth and physiology depending on the plant species and type of CNT. This study focused on the effects of CNTs on plant phenotype with growth, time to flowering, fruiting time as endpoints, and physiology, through amino acid and phytohormone content, in tomato after exposure to multiple types of CNTs. Plants grown in CNT-contaminated soil exhibited a delay in early growth and flowering (especially in treatments of 1 mg/kg multi-walled nanotubes (MWNTs), 10 mg/kg MWNTs, and 1 mg/kg MWNTs-COOH). However, CNTs did not affect plant growth or height later in the life cycle. No significant differences in abscisic acid (ABA) and citrulline content were observed between the treated and control plants. However, single-walled nanotube (SWNT) exposure significantly increased salicylic acid (SA) content in tomato. These results suggest that SWNTs may elicit a stress response in tomatoes. Results from this study offer more insight into how plants respond and acclimate to CNTs. These results will lead to a better understanding of CNT impact on plant phenotype and physiology.

Research paper thumbnail of Only a matter of time: the impact of daily and seasonal rhythms on phytochemicals

Phytochemistry Reviews, 2019

Plants regulate molecular bioactivity in response to daily and seasonal environmental fluctuation... more Plants regulate molecular bioactivity in response to daily and seasonal environmental fluctuations in temperature, light, humidity, and precipitation. These rhythms interconnect, overlap, and feedback both into each other and into the plant's endogenous circadian clock. The resulting regulatory network tightly ensures that the overall phytochemical composition is highly adaptive to the plant's needs at any point in time. Temporally coordinated control of primary and secondary metabolism ensures phytochemicals are in tune with the demands of the environment and the available resources. As a consequence, phytochemical composition varies throughout the day and year. This variation in phytochemical abundance and composition across time can affect experimental results and conclusions. Understanding how phytochemical composition varies across time is critical for uncovering the underlying regulatory connections and ultimately improving the quality of phytochemical products. Herein, we review the mechanisms underlying diel and seasonal variations in phytochemical composition and provide examples of temporal regulation of specific compounds within phenol, terpenoid, and alkaloid phytochemical classes.

Research paper thumbnail of Plant Uptake of Per‐ and Polyfluoroalkyl Acids under a Maximum Bioavailability Scenario

Environmental Toxicology and Chemistry, 2019

Although many studies have evaluated the fate of per‐ and polyfluoroalkyl acids (PFAAs) in aquati... more Although many studies have evaluated the fate of per‐ and polyfluoroalkyl acids (PFAAs) in aquatic environments, few have observed their fate in terrestrial environments. It has been proposed that ingestion could be a major PFAA exposure route for humans. We determined PFAA uptake in radish, carrot, and alfalfa under a maximum bioavailability scenario. Bioconcentration factors (BCFs) were determined in the edible tissue of radish (perfluorobutanesulfonate [PFBS] = 72; perfluorohexanesulfonate [PFHxS] = 13; perfluoroheptanoate [PFHpA] = 65; perfluorooctanoate [PFOA] = 18; perfluorooctanesulfonate [PFOS] = 2.9; and perfluorononanoate [PFNA] = 9.6), carrot (PFBS = 5.9; PFHxS = 1.1; PFHpA = 29; PFOA = 3.1; PFOS = 1; and PFNA = 1.4), and alfalfa (PFBS = 107; PFHxS = 12; PFHpA = 91; PFOA = 10; PFOS = 1.4; and PFNA = 1.7). Some of these PFAA BCFs are as much as 2 orders of magnitude higher than those measured previously in plants grown in biosolid‐amended soils. Environ Toxicol Chem 2019;38:2497–2502. © 2019 SETAC

Research paper thumbnail of Carbon-based nanomaterials elicit changes in physiology, gene expression, and epigenetics in exposed plants: A review

Current Opinion in Environmental Science & Health, 2018

As the use of carbon-based nanomaterials (CNMs) in various consumer goods continues to rise, it i... more As the use of carbon-based nanomaterials (CNMs) in various consumer goods continues to rise, it is imperative that we accumulate a better understanding of their impact and fate in the environment. In particular, it is important to have an understanding of how these materials may affect plants as these organisms have both economic importance and an impact on human health. CNMs have exhibited both beneficial and toxic effects, as well as no effect, on plant growth and reproduction. Exposure to CNMs has also had an effect on oxidative stress, water channels, phytohormones, gene expression, and epigenetics. The present review briefly discusses the current understanding and knowledge gaps of how exposure to CNMs might lead to changes in plant growth and physiology by altering gene expressions and epigenomes.

Research paper thumbnail of Determination of carbon nanotubes effects on plant phenotype, plant physiology and bollworm development

Research paper thumbnail of Quantifying Environmental Maternal Effects in the Invasive Plant, Silene Latifolia

One of the over-arching goals of biology is to determine the relative importance of nature versus... more One of the over-arching goals of biology is to determine the relative importance of nature versus nurture. Nature versus nurture reflects the relative contribution of an individual’s genetic makeup and environment to its growth and reproduction. In addition, the environment experienced by an individual’s mother can also indirectly affect the performance of her offspring – these are environmental maternal effects (EME). For example, if a mother experiences a high quality environment, her offspring may respond with enhanced growth. We expect natural variation in habitat quality to lead to high levels of EME since mothers will vary in the environment they experience. The goal of my thesis was to quantify EME using a plant species, Silene latifolia, which is native to Europe and invasive in North America. I did this by experimentally comparing the amount of variation in life history traits between two generations: Natural (Parent) and Uniform (Offspring). The Parent generation was obtai...

Research paper thumbnail of Carbon nanotubes affect early growth, flowering time and phytohormones in tomato

Chemosphere, 2020

Carbon nanotube (CNT) applications are increasing in consumer products, including agriculture dev... more Carbon nanotube (CNT) applications are increasing in consumer products, including agriculture devices, making them an important contaminant to study in the field of plant nanotoxicology. Several studies have observed the uptake and effects of CNTs in plants. However, in other studies differing results were observed on growth and physiology depending on the plant species and type of CNT. This study focused on the effects of CNTs on plant phenotype with growth, time to flowering, fruiting time as endpoints, and physiology, through amino acid and phytohormone content, in tomato after exposure to multiple types of CNTs. Plants grown in CNT-contaminated soil exhibited a delay in early growth and flowering (especially in treatments of 1 mg/kg multi-walled nanotubes (MWNTs), 10 mg/kg MWNTs, and 1 mg/kg MWNTs-COOH). However, CNTs did not affect plant growth or height later in the life cycle. No significant differences in abscisic acid (ABA) and citrulline content were observed between the treated and control plants. However, single-walled nanotube (SWNT) exposure significantly increased salicylic acid (SA) content in tomato. These results suggest that SWNTs may elicit a stress response in tomatoes. Results from this study offer more insight into how plants respond and acclimate to CNTs. These results will lead to a better understanding of CNT impact on plant phenotype and physiology.

Research paper thumbnail of Only a matter of time: the impact of daily and seasonal rhythms on phytochemicals

Phytochemistry Reviews, 2019

Plants regulate molecular bioactivity in response to daily and seasonal environmental fluctuation... more Plants regulate molecular bioactivity in response to daily and seasonal environmental fluctuations in temperature, light, humidity, and precipitation. These rhythms interconnect, overlap, and feedback both into each other and into the plant's endogenous circadian clock. The resulting regulatory network tightly ensures that the overall phytochemical composition is highly adaptive to the plant's needs at any point in time. Temporally coordinated control of primary and secondary metabolism ensures phytochemicals are in tune with the demands of the environment and the available resources. As a consequence, phytochemical composition varies throughout the day and year. This variation in phytochemical abundance and composition across time can affect experimental results and conclusions. Understanding how phytochemical composition varies across time is critical for uncovering the underlying regulatory connections and ultimately improving the quality of phytochemical products. Herein, we review the mechanisms underlying diel and seasonal variations in phytochemical composition and provide examples of temporal regulation of specific compounds within phenol, terpenoid, and alkaloid phytochemical classes.

Research paper thumbnail of Plant Uptake of Per‐ and Polyfluoroalkyl Acids under a Maximum Bioavailability Scenario

Environmental Toxicology and Chemistry, 2019

Although many studies have evaluated the fate of per‐ and polyfluoroalkyl acids (PFAAs) in aquati... more Although many studies have evaluated the fate of per‐ and polyfluoroalkyl acids (PFAAs) in aquatic environments, few have observed their fate in terrestrial environments. It has been proposed that ingestion could be a major PFAA exposure route for humans. We determined PFAA uptake in radish, carrot, and alfalfa under a maximum bioavailability scenario. Bioconcentration factors (BCFs) were determined in the edible tissue of radish (perfluorobutanesulfonate [PFBS] = 72; perfluorohexanesulfonate [PFHxS] = 13; perfluoroheptanoate [PFHpA] = 65; perfluorooctanoate [PFOA] = 18; perfluorooctanesulfonate [PFOS] = 2.9; and perfluorononanoate [PFNA] = 9.6), carrot (PFBS = 5.9; PFHxS = 1.1; PFHpA = 29; PFOA = 3.1; PFOS = 1; and PFNA = 1.4), and alfalfa (PFBS = 107; PFHxS = 12; PFHpA = 91; PFOA = 10; PFOS = 1.4; and PFNA = 1.7). Some of these PFAA BCFs are as much as 2 orders of magnitude higher than those measured previously in plants grown in biosolid‐amended soils. Environ Toxicol Chem 2019;38:2497–2502. © 2019 SETAC

Research paper thumbnail of Carbon-based nanomaterials elicit changes in physiology, gene expression, and epigenetics in exposed plants: A review

Current Opinion in Environmental Science & Health, 2018

As the use of carbon-based nanomaterials (CNMs) in various consumer goods continues to rise, it i... more As the use of carbon-based nanomaterials (CNMs) in various consumer goods continues to rise, it is imperative that we accumulate a better understanding of their impact and fate in the environment. In particular, it is important to have an understanding of how these materials may affect plants as these organisms have both economic importance and an impact on human health. CNMs have exhibited both beneficial and toxic effects, as well as no effect, on plant growth and reproduction. Exposure to CNMs has also had an effect on oxidative stress, water channels, phytohormones, gene expression, and epigenetics. The present review briefly discusses the current understanding and knowledge gaps of how exposure to CNMs might lead to changes in plant growth and physiology by altering gene expressions and epigenomes.