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open access

4-Coumarate 3-hydroxylase in the lignin biosynthesis pathway is a cytosolic ascorbate peroxidase

Description: Article describes an enzyme catalyzing the direct 3-hydroxylation of 4-coumarate to caffeate in lignin biosynthesis as a bifunctional peroxidase that oxidizes both ascorbate and 4-coumarate at comparable rates.
Date: April 30, 2019
Creator: Barros, Jaime; Escamilla-Treviño, Luis; Song, Luhua; Rao, Xiaolan; Serrani-Yarce, Juan Carlos; Palacios, Maite Docampo et al.
Partner: UNT College of Science
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

ABA is required for the accumulation of APX1 and MBF1c during a combination of water deficit and heat stress

Description: This article studies the response of mutants impaired in ABA signalling (abi1-1) and biosynthesis (aba1-1) to a combination of water deficit and heat stress.
Date: July 18, 2016
Creator: Zandalinas, Sara I.; Balfagón, Damián; Arbona, Vicent; Gómez-Cadenas, Aurelio; Inupakutika, Madhuri A. & Mittler, Ron
Partner: UNT College of Arts and Sciences
open access

The accessory role of the diaphragmaticus muscle in lung ventilation in the estuarine crocodile Crocodylus porosus

Description: This article explores lung ventilation in crocodilians through direct measurements of ventilation, metabolic rate, and arterial blood gases of juvenile estuarine crocodiles in varying conditions. The results suggest that, in C. porosus, costal ventilation alone is able to support metabolic demands at rest, and the diaphragmaticus is largely an accessory muscle used at times of elevated metabolic demand.
Date: November 17, 2011
Creator: Munns, Suzanne L.; Owerkowicz, Tomasz; Andrewartha, Sarah J. & Frappell, Peter B.
Partner: UNT College of Science
open access

Accumulation of Flavonols over Hydroxycinnamic Acids Favors Oxidative Damage Protetion under Abiotic Stress

Description: This article reports on the characterization of the different antioxidant mechanisms of tomato plants subjected to heat stress, salinity stress, or a combination of both stresses.
Date: June 15, 2016
Creator: Martinez, Vicente; Mestre, Teresa C.; Rubio, Francisco; Girones-Vilaplana, Amadeo; Moreno, Diego; Mittler, Ron et al.
Partner: UNT College of Arts and Sciences
open access

Acid-base regulation in the air-breathing swamp eel ( Monopterus albus) at different temperatures

Description: Article describes study in which researchers characterized the influence of temperature on arterial acid–base balance and intracellular pH (pHi) in the bimodal-breathing swamp eel, Monopterus albus.
Date: February 27, 2018
Creator: Thinh, Phan Vinh; Phuong, Nguyen Thanh; Brauner, Colin J.; Huong, Do Thi Thanh; Wood, Andrew T.; Kwan, Garfield T. et al.
Partner: UNT College of Science
open access

N-Acylethanolamines are Metabolized by Lipoxygenase and Amidohydrolase in Competing Pathways during Cottonseed Imbibition

Description: Article on N-acylethanolamines metabolizing by lipoxygenase and amidohydrolase in competing pathways during cottonseed inbibition.
Date: September 2002
Creator: Shrestha, Rhidaya; Noordermeer, Minke A.; Van der Stelt, Marcelis; Veldink, Gerrit A. & Chapman, Kent D.
Partner: UNT College of Arts and Sciences
open access

N-Acylethanolamines in Signal Transduction of Elicitor Perception. Attenuation of Alkalinization Response and Activation of Defense Gene Expression

Description: Article on N-acylethanolamines in signal transduction of elicitor perception and the attenuation of alkalinization response and activation of defense gene expression.
Date: December 1999
Creator: Tripathy, Swati; Venables, Barney J. & Chapman, Kent D.
Partner: UNT College of Arts and Sciences

Adopt-A-Molecule: A guided Inquiry for Increasing Student Interest in Organic Chemistry [Presentation]

Description: Presentation for the 2010 University Scholars Day at the University of North Texas. This presentation discusses research on the Adopt-A-Molecule project, a 9-week long, two-part term project, undertaken by students enrolled in the first of the two-semester sequence in organic chemistry (Fall 2009).
Date: April 15, 2010
Creator: Musgrave, Paul & Dandekar, Sushama Ashok
Partner: UNT Honors College
open access

Advanced Molecular and Microbial Techniques: a Complete Laboratory Notebook

Description: The purpose of this project is to produce a complete and thorough notebook that may be used to supplement laboratory coursework. Its intent is to be used primarily by the students to aid them in understanding background information and the proper laboratory procedures involved in various types of experiments. The laboratory notebook is a summation of all the experiments and procedures used in the six-credit hour Advanced Microbial and Molecular Biology (BIOL 5160) course offered during the summer semester at the University of North Texas. This class is a team taught effort by Professors O'Donovan and Kunz. The course is constructed as an intensive practice exercise to teach the student about gene mutations, biosynthetic pathways, preparation and analysis of plasmid DNA, and many other topics included in the notebook.
Date: May 1998
Creator: Brito-Rodriquez, Carmen Lydia
Partner: UNT Libraries
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