Search Results

open access

9-Lipoxygenase Oxylipin Pathway in Plant Response to Biotic Stress

Description: The activity of plant 9-lipoxygenases (LOXs) influences the outcome of Arabidopsis thaliana interaction with pathogen and insects. Evidence provided here indicates that in Arabidopsis, 9-LOXs facilitate infestation by Myzus persicae, commonly known as the green peach aphid (GPA), a sap-sucking insect, and infection by the fungal pathogen Fusarium graminearum. in comparison to the wild-type plant, lox5 mutants, which are deficient in a 9-lipoxygenase, GPA population was smaller and the insect spent less time feeding from sieve elements and xylem, thus resulting in reduced water content and fecundity of GPA. LOX5 expression is induced rapidly in roots of GPA-infested plants. This increase in LOX5 expression is paralleled by an increase in LOX5-synthesized oxylipins in the root and petiole exudates of GPA-infested plants. Micrografting experiments demonstrated that GPA population size was smaller on plants in which the roots were of the lox5 mutant genotype. Exogenous treatment of lox5 mutant roots with 9-hydroxyoctadecanoic acid restored water content and population size of GPA on lox5 mutants. Together, these results suggest that LOX5 genotype in roots is critical for facilitating insect infestation of Arabidopsis. in Arabidopsis, 9-LOX function is also required for facilitating infection by F. graminearum, which is a leading cause of Fusarium head blight (FHB) disease in wheat and other small grain crops. Loss of LOX1 and LOX5 function resulted in enhanced resistance to F. graminearum infection. Similarly in wheat, RNA interference mediated silencing of the 9-LOX homolog TaLpx1, resulted in enhanced resistance to F. graminearum. Experiments in Arabidopsis indicate that 9-LOXs promote susceptibility to this fungus by suppressing the activation of salicylic acid-mediated defense responses that are important for basal resistance to this fungus. the lox1 and lox5 mutants were also compromised for systemic acquired resistance (SAR), an inducible defense mechanism that is systemically activated throughout a plant in response to a …
Date: May 2012
Creator: Nalam, Vamsi J.
Partner: UNT Libraries
open access

Biochemical and molecular-genetic characterization of SFD1’s involvement in lipid metabolism and defense signaling

Description: Article describes study which sought to to determine if the dihydroxyacetone phosphate (DHAP) reductase activity and chloroplast localization are required for the Arabidopsis thaliana SFD1 (suppressor of fatty acid desaturase deficiency1) gene’s involvement in galactolipid metabolism and systemic acquired resistance (SAR) signaling.
Date: February 7, 2012
Creator: Lorenc-Kukula, Katarzyna; Chaturvedi, Ratnesh; Roth, Mary; Welti, Ruth & Shah, Jyoti
Partner: UNT College of Arts and Sciences
open access

Bringing real world applications for wireless sensor networks into the classroom: Telemetric monitoring of water quality in an artificial stream [2012]

Description: This report discusses research on aquatic sensors and telemetric monitoring of water quality in an artificial stream with the use of a wireless sensor networks (WSN) using the ZigBee protocol to remotely monitor an artificial aquatic ecosystem. This research is part of Research Experiences for Teachers (RET) in Sensor Education, a National Science Foundation (NSF) funded grant project.
Date: 2012
Creator: Bunn, Zac; Guerrero, Jose; Wolf, Lori; Fu, Shengli; Hoeinghaus, David; Driver, Luke et al.
Partner: UNT College of Engineering

Bringing real world applications for wireless sensor networks into the classroom: Telemetric monitoring of water quality in an artificial stream [2012: Poster]

Description: This poster discusses research on bringing real world applications for wireless sensor networks into the classroom and covers the use of a wireless sensor network (WSN) using the ZigBee protocol to remotely monitor an artificial aquatic ecosystem.
Date: 2012
Creator: Bunn, Zac; Guerrero, Jose; Wolf, Lori; Fu, Shengli; Hoeinghaus, David; Driver, Luke et al.
Partner: UNT College of Engineering
open access

Cardiac and metabolic physiology of early larval zebrafish (Danio rerio) reflects parental swimming stamina

Description: Article describes experiment in which mature adult zebrafish (Danio rerio) were subjected to a swimming performance test that allowed separation into low swimming stamina or high swimming stamina groups in order to determine if inherited traits that support enhanced swimming stamina in offspring appear only in juveniles and/or adults, or if these traits actually appear earlier in the morphologically quite different larvae.
Date: February 24, 2012
Creator: Gore, Matthew & Burggren, Warren W.
Partner: UNT College of Arts and Sciences
open access

Cardiac and metabolic physiology of early larval zebrafish (Danio rerio) reflects parental swimming stamina

Description: This article explores swimming stamina in fish. Mature adult zebrafish (Danio rerio) were subjected to a swimming performance test and then bred within performance groups to discover if enhanced swimming stamina in offspring appears only in juveniles/adults, or if these traits appear as early as larvae.
Date: February 24, 2012
Creator: Burggren, Warren W. & Gore, Matthew
Partner: UNT College of Science
open access

Changes in Cell Wall Carbohydrate Extractability are Correlated with Reduced Recalcitrance of HCT Downregulated Alfalfa Biomass

Description: Article on changes in cell wall carbohydrate extractability and how these are correlated with reduced recalcitrance of hydroxycinnamoyl transferase (HCT) downregulated alfalfa biomass.
Date: August 2012
Creator: Pattathil, Sivakumar; Saffold, Trina; Gallego-Giraldo, Lina; O'Neill, Malcolm; York, William S.; Dixon, R. A. et al.
Partner: UNT College of Arts and Sciences
open access

Constraints-based stoichiometric analysis of hypoxic stress on steroidogenesis in fathead minnows, Pimephales promelas

Description: This article presents a study in which an in silico genome-scale metabolic model of steroidogenesis is used to investigate the effects of hypoxic stress on steroid hormone productions in fish. This article introduces a powerful model for pathway analysis that can lend insights on the effects of various stressor scenarios on metabolic functions.
Date: May 15, 2012
Creator: Hala, David; Petersen, Lene H.; Martinovic, Dalma & Huggett, Duane B.
Partner: UNT Institute of Applied Sciences
open access

Coprologic survey of endoparasites from Darwin’s fox (Pseudalopex fulvipes) in Chiloé, Chile

Description: Article on parasite presence in the critically endangered Darwin's fox (Pseudalopex fulvipes) in Chile. Parasites found include species and genera reported for the first time in Darwin's fox.
Date: 2012
Creator: Jiménez, Jaime E.; Briceño, C.; Alcaíno, H.; Vásquez, P.; Funk, S. & González-Acuña, D.
Partner: UNT College of Science
open access

Derivation of the evolution of empathic other-regarding social emotions as compared to non-social self-regarding emotions

Description: Article accompanying a poster presentation for the 2012 Computational Neuroscience Annual Meeting. This article discusses the derivation of the evolution of empathic other-regarding social emotions as compared to non-social self-regarding emotions.
Date: July 16, 2012
Creator: Tam, Nicoladie D.
Partner: UNT College of Arts and Sciences
open access

Down-regulation of the caffeic acid O-methyltransferase gene in switchgrass reveals a novel monolignol analog

Description: Article on the down-regulation of the caffeic acid O-methyltransferase gene in switchgrass revealing a novel monolignol analog.
Date: September 21, 2012
Creator: Tschaplinski, Timothy J.; Standaert, Robert F.; Engle, Nancy L.; Martin, Madhavi Z.; Sangha, Amandeep K.; Parks, Jerry M. et al.
Partner: UNT College of Arts and Sciences
open access

Effect of selection for commercially productive traits on the plasticity of cardiovascular regulation in chicken breeds during embryonic development

Description: Article investigates basic cardiovascular physiology in the Red Junglefowl, the broiler, and the White Leghorn breeds at 90% of incubation. The authors aimed to identify breed-specific features of arterial blood pressure and heart rate as well as the physiological mechanisms regulating them. They concluded that selection for rapid growth shifts cardiovascular regulatory plasticity to emphasize mechanisms that modulate pressure, and that selection for egg-laying capacity emphasizes mechanisms that modulate heart rate.
Date: October 1, 2012
Creator: Crossley, Dane A., II & Altimiras, J.
Partner: UNT College of Arts and Sciences
Back to Top of Screen